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How to Unlock Hidden Snapchat Filters and Lenses



One of the best reasons to use Snapchat is its collection of fun filters and lenses that make your selfies pop.

There are plenty of choices from the get-go, with the selection changing on a regular basis. However, Snapchat also has secret filters and lenses that you need to unlock before they’re accessible. And, even then, they may only be available for a limited time.

So, how do you unlock Snapchat filters and lenses? Including hidden ones? In this article, we’ll explain everything you need to know.

Snapchat Filters and Lenses: What’s the Difference?

In Snapchat, there are two effects that you can apply to your photos and videos: filters and lenses. While they may sound like the same thing, there are some differences between them.

Snapchat lenses are the meat of the app and the feature that sets it apart from the rest. Essentially, lenses are augmented reality filters, and they’re mostly designed for your phone’s selfie camera. It’s how all the cool kids are turning themselves into cute dogs or puking rainbows.

Filters are more basic, as they mostly change the color of your image or video (like on Instagram). However, they can also add information, such as geofilters, time, or weather. Our list of the best Snapchat filters and lenses will help you find some new favorites.

How to Use Snapchat Filters

For the filters, all you need to do is snap a photo (front or rear cameras) and then swipe left and right to go through the different filters. The filters vary depending on whether you just took a still image or recorded a video.

The further right you swipe, the more unique filters you’ll see. These include geofilters, which are overlays featuring famous locations and cities, or special ones for holidays and events, such as sports games or music festivals.

When you’re out enjoying life, make sure to launch Snapchat, as you never know what geofilters you’ll find. If you’re feeling creative, you can even learn how to make your own Snapchat filter.

How to Use Lenses

If you’re new to Snapchat, you might not know where to look to find lenses. In the camera view, enable the selfie camera (front-facing) and then press the small smiley face icon to the right of the capture button. You can then scroll through the available lenses. The lenses on the left side are interactive games called Snappables, while the right side features the collection of standard lenses.

As you look through the lenses, you’ll see a preview of each one in action. There are special effects on each lens that occurs when you follow the directions on the screen. Some lenses work with the rear-facing camera too, and others are best used with a friend.

Always in Rotation

The fun with Snapchat lies in the always-changing line-up of available filters and lenses for users to choose from. While this means more variety from time-to-time, it also means not all of them are going to be around forever. If you want to use a lens, you’d better use it when you see it.

And of course, there are some limited edition lenses and filters that are only available briefly. These are mostly to promote that hot television show that’s airing, a product with a sponsor, or even certain theme parks.

How to Find and Use Snapcodes

Snapchat has special filters and lenses locked away behind Snapcodes. What are Snapcodes? They’re similar to QR codes, and you can find them on limited edition products, in tweets, or even through basic hyperlinks.

They are slightly different than normal QR codes, though, and you’ll be able to tell the difference right away. Snapcodes feature the Snapchat logo icon, with a dotted pattern surrounding the ghost mascot. Each Snapcode is unique and only lasts for a certain amount of time.

Scan the Snapcode

Unlock Snapchat Lenses Snapchat Community

If you find a Snapcode that’s a hyperlink, all you have to do is tap on the link to launch Snapchat and unlock the lens. But if you’re working with a Snapcode image, there’s slightly more work involved.

Launch Snapchat and then switch to the rear-view camera. Get the Snapcode into the viewfinder and have it focus so the image is clear. Then just do a long-press on the Snapcode on the screen until your phone vibrates when it’s recognized.

The Snapcode can be used for a variety of things, like making it easier to follow users, but we’re only discussing the ones to unlock lenses.

Unlock Your New Lens

After you scan the Snapcode or tap the link, you’ll see the name of the filter in a popup. Just tap on the Unlock button to add it to your Lens repertoire.

As mentioned earlier, each code is unique and you can only use it for a limited time. The duration that each Snapcode is available is different, but Snapchat tells you how long you can use it for once it’s unlocked.

On top of that, Snapcodes may not be available forever, as some of them are used to promote something. Even if you find some codes from previous promos, they may have expired already.

Experiment With New Lenses and Have Fun

Once you’ve unlocked a hidden lens, be sure to give it a spin!

To use your new Snapchat lenses, go back to the camera and enable selfie view using the front-facing camera. Then tap the smiley face button to access the available selfie filters and lenses. Any secret ones you’ve just unlocked show up first, so they’re the quickest to access. To use it, just tap the one you want and then follow the directions on the screen. It’s that easy!

Where to Find Hidden Lenses and Filters

We mentioned earlier that secret Snapchat filters and lenses are usually available for a limited time to promote a new product, popular TV show, or even a location. Because of this, the availability of secret filters varies. Here are some tips that can help you find more lenses and filters that you can temporarily add to your library.

Snapchat Lens Studio

Snapchat Lens Studio Lenses

On the Snapchat Lens Studio, you can find tons of lenses made by creative Snapchat users. When you arrive on the page, you’ll see a carousel of fun lenses handpicked by Snapchat itself. Simply scroll down the page to find a huge list of trending lenses. You can scan any of these Snapcodes to upload them to your app.

The Creators page features a list of official Snapchat lens creators. Here, you can browse through each lens creators’ profile, and experiment with the unique lenses they’ve made.

Find Lenses From the Snapchat App

If you don’t want to go through the trouble of scanning Snapcodes from Snapchat’s site, you can find even more lenses right from the Snapchat app.

As you scroll through the carousel of lenses, swipe up on the screen. This brings up a page full of popular Snapchat filters that don’t come with the app by default. Select any filters that look fun to use, and you can start using them instantly.

Keep an Eye Out for Promotions

Occasionally, a brand, TV show, movie, or even theme park might release a lens that you can only use for a limited time. In the past, HBO released a special filter to celebrate Game of Thrones season premiere. Even Wendy’s joined in on the Snapchat fun by putting a Snapcode on customers’ cups—every time the code got scanned, Wendy’s donated $5 to a foster care charity.

We can’t predict when these lenses will get released, so it’s best to just keep an eye out for any news on social media. When you see your friends snapping you with a lens you’ve never seen before, you’ll know that a new hidden Snapcode has been released.

Unlock Snapchat Filters and Start Snapping

Now that you know all about how Snapchat’s filters and lenses work, as well as the best ways to find them, it’s time to have some fun. Send some snaps using the new lenses you’ve discovered, and you’ll definitely surprise your friends.

To become even more Snapchat-savvy, check out the Snapchat features all users need to learn.

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Brit scientists snap highest ever resolution picture of the sun



The University of Lancashire showed off the highest-ever resolution images of the sun and its atmosphere. (PA)

British researchers have collaborated with Nasa to capture the highest-ever resolution images of the sun.

The images, analysed by researchers at the University of Central Lancashire (UCLan) and collaborators from Nasa’s Marshall Space Flight Centre, provide astronomers with a better understanding of the sun’s complex atmosphere.

Until now, certain parts of the Sun’s atmosphere had appeared dark or mostly empty.

However the new images have revealed it actually contains strands of hot electrified gases that are around 500km (311 miles) in width.

The ultra-sharp images were taken by Nasa’s High-Resolution Coronal Imager (Hi-C) telescope, carried into space on a sub-orbital rocket flight.

The telescope can pick out structures in the Sun’s atmosphere as small as 70km in size, or about 0.01% of its total size.

Photo supplied by University of Lancashire showing the highest-ever resolution images of the sun and its atmosphere. The images, analysed by researchers at the University of Central Lancashire (UCLan) and collaborators from NASA???s Marshall Space Flight Centre, provide astronomers with a better understanding of the Sun???s complex atmosphere.

These images provide astronomers with a better understanding of the sun’s complex atmosphere. (PA)

Although what exactly is creating these strands remains unclear, scientific debate will now focus on why they are formed and how their presence helps us understand the eruption of solar flares and solar storms that could affect life on Earth.

Robert Walsh, professor of solar physics at UCLan, said the images provided an ‘ultra-high definition’ glimpse of the sun for the first time.

‘Until now, solar astronomers have effectively been viewing our closest star in ‘standard definition’, whereas the exceptional quality of the data provided by the Hi-C telescope allows us to survey a patch of the sun in ‘ultra-high definition’ for the first time,’ he said.

Photo supplied by University of Lancashire showing the highest-ever resolution images of the sun and its atmosphere. The images, analysed by researchers at the University of Central Lancashire (UCLan) and collaborators from NASA???s Marshall Space Flight Centre, provide astronomers with a better understanding of the Sun???s complex atmosphere.

The ultra-sharp images were taken by Nasa’s High-Resolution Coronal Imager (Hi-C) telescope. (PA)

Tom Williams, a postdoctoral researcher at UCLan who worked on the Hi-C data, said the images would help provide a greater understanding of how the Earth and Sun related to each other.

‘This is a fascinating discovery that could better inform our understanding of the flow of energy through the layers of the Sun and eventually down to Earth itself,’ he said.

‘This is so important if we are to model and predict the behaviour of our life-giving star.’

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What Is Jitsi and Is it More Secure Than Zoom?



Online conference apps help to maintain business and family connections when you can’t all appear in the same room. There is a wealth of video conferencing and video chat apps to choose from. However, if you’re talking about personal matters or discussing the details of a business contract, you need to know the service you’re using will protect your privacy.

Jitsi is an encrypted open-source video conferencing app you can use to protect your privacy. So, how does Jitsi compare to Zoom? Is Jitsi easy to use? Should you switch to Jitsi?

Let’s take a look.

What Is Jitsi?

Jitsi Meet is a secure video conferencing app you can use to chat with people from a web browser, Android, or iOS app.

The version included in the link is the web deployment of the Jitsi Meet software. Anyone can click the link, create a video call, and begin chatting. However, for the more technically minded, you can download and install the Jitsi Meet software to a private server, drastically increasing your privacy. For the majority of users, the regular Jitsi video web chat and smartphone apps are perfect.

Jitsi Meet supports up to 75 participants at the current time. However, for best results, the development team suggests limiting that number to a maximum of 35 participants otherwise, “the experience will suffer.”

You can work around this limitation using the integrated live-streaming option. Jitsi allows you to live-stream your video conference to an external streaming service, such as YouTube, to increase your number of viewers without negatively impacting on the video conferencing quality.

The Jitsi Meet web app and smartphone apps are incredibly simple to use. You don’t have to worry about having a username or signing up for the service. Type a name for your Jitsi video conferencing room, and press Go. Share the name of the room with your friends, family, or colleagues, and they can begin joining you.

Jitsi Meet Features

Jitsi comes with a substantial list of features, some of which are only available as premium tools in other video conferencing apps. Here are some of Jitsi’s features:

  • Screensharing and live chat
  • Dial-in option
  • Livestreaming
  • Blur my background (currently in beta)
  • Slack integration
  • Jitsi Meetings Google Chrome extension to integrate Google Calendar and Office 365 Calendar

Does Jitsi Use Encryption?

One of the most important Jitsi features is privacy. Jitsi uses hop-by-hop encryption to protect your video conference.

Hop-by-hop encryption means each stage of the video call is encrypted in part. Your video call to the server carries encryption. The server decrypts the video call, then re-encrypts it and forwards it to the video participants.

Hop-by-hop encryption isn’t perfect, by any means. It means that the server owner could eavesdrop on your conversation if they wish. The way around this is to host a Jitsi Meet server for total privacy. Of course, that isn’t possible for everyone. However, there are no indications that Jitsi’s owners, 8×8, are eavesdropping on private video conversations.

Still, the increase in privacy is significant, especially as the volume of video calling increases.

How to Use Jitsi for Video Calling

As mentioned above, Jitsi makes video calling a cinch. Here’s how you start a Jitsi Meet video call using the web app and smartphone apps.

Using the Jitsi Web App

jitsi web app dual screen

  1. First up, head to Jitsi Meet.
  2. In the white box, type your meeting room name. Then hit Go.
  3. When your meeting begins, select the white i icon in the bottom right corner. Add a secure password. Do this, or people can access your video chat.
  4. Press the copy to clipboard icon, then paste the meeting details to whoever you want to invite to your chat.

jitsi change password meeting room web app

That’s it. A Jitsi Meet chat is that straightforward to get up and running.

Using the Jitsi Android or iOS App

You need to download the Android or iOS app to follow this section. The images are taken from the Android app, but the iOS app is the same.

Download: Jitsi Meet for Android | iOS (Both Free)

  1. Open the Jitsi Meet Android or iOS app.
  2. Type your meeting room name, then select Create/Join.
  3. Tap the three-dot settings menu in the bottom right corner, then drag the settings panel upward to reveal more options.
  4. Select Add meeting password, then add your secure password. Do this, or people can access your video chat.
  5. From the same settings menu, select Invite someone. You can invite people from your contacts list, or share the meeting invitation on a different service.

There is one thing you should also note. The Jitsi meeting room doesn’t close automatically after the host leaves. No option appears to the host or other users to close the call, either.

Is Jitsi More Secure Than Zoom?

At the start of the COVID-19 pandemic, Zoom saw a drastic uptick in subscribers, rising from 10 million users to over 200 million users in just a few weeks. Suddenly, the eyes of the world were focusing on Zoom.

Unfortunately for Zoom, it wasn’t ready for the level of scrutiny that would follow. Privacy and security issues abound, and the management and development teams are left scrambling to fix a raft of issues.

Eric S. Yuan, chief executive of Zoom Video Communications, openly admits that the sudden stratospheric rise of Zoom caught the team napping. If not for the coronavirus, Zoom probably wouldn’t have taken such a deep delve into the security and privacy issue for some time.

But, what does that mean for Jitsi Meet? Is it truly more secure than Zoom?

Jitsi Meet has a few security and privacy measures that set it aside from Zoom. For once, Jitsi Meet is an open-source project, meaning anyone can download and vet the project. At the time of writing, there are no security warnings relating to Jitsi Meet sending data to external sources or leaking private information elsewhere.

The level of encryption is what most people want to know about. Jitsi Meet does not use end-to-end encryption (E2EE), like FaceTime, Signal, or WhatsApp. Because Jitsi Meet uses the WebRTC protocol, there is no way of implementing E2EE, at least not at the current time.

That doesn’t mean Jitsi Meet is insecure. Far from it. But there is a definite weak point in the privacy process, and that is the decryption and re-encryption of data on a Jitsi Meet server. The way around this is to install the Jitsi Meet software on a private server that you control, which means all of the data remains secure.

What’s the Best Video Conferencing App?

Many privacy advocates suggest using Jitsi Meet instead of Zoom or other video conferencing alternatives, including the Tor Project:

Other security researchers aren’t so sure, reasoning that although Jitsi Meet is open source, it still suffers from similar limitations to Zoom (as it uses similar protocols).

If you must use Zoom, check out these tips on how you can attempt to increase your security and privacy. But if you want a truly secure alternative, Signal allows fully encrypted video calling with a limited number of users.

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Why it’s too early to start giving out “immunity passports”



Imagine, a few weeks or months from now, having a covid-19 test kit sent to your home. It’s small and portable, but pretty easy to figure out. You prick your finger as in a blood sugar test for diabetics, wait maybe 15 minutes, and bam—you now know whether or not you’re immune to coronavirus. 

If you are, you can request government-issued documentation that says so. This is your “immunity passport.” You are now free to leave your home, go back to work, and take part in all facets of normal life—many of which are in the process of being booted back up by “immunes” like yourself. 

Pretty enticing, right? Some countries are taking the idea seriously. German researchers want to send out hundreds of thousands of tests to citizens over the next few weeks to see who is immune to covid-19 and who is not, and certify people as being healthy enough to return to society. The UK, which has stockpiled over 17.5 million home antibody testing kits, has raised the prospect of doing something similar, although this has come under major scrutiny from scientists who have raised concerns that the test may not be accurate enough to be useful. As the pressure builds from a public that has been cooped up for weeks, more countries are looking for a way out of strict social distancing measures that doesn’t require waiting 12 to 18 months for a vaccine (if one even comes).

So how does immunity testing work? Very soon after infection by SARS-CoV-2, polymerase chain reaction (PCR) tests can be used to look for evidence of the virus in the respiratory tract. These tests work by greatly amplifying viral genetic material so we can verify what virus it comes from. But weeks or months after the immune system has fought the virus off, it’s better to test for antibodies.

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About six to 10 days after viral exposure, the body begins to develop antibodies that bind and react specifically to the proteins found on SARS-CoV-2. The first antibody produced is called immunoglobulin m (IgM), which is short-lived and only stays in the bloodstream for a few weeks. The immune system refines the antibodies and just a few days later will start producing immunoglobulins G (IgG) and A (IgA), which are much more specific. IgG stays in the blood and can confer immunity for months, years, or a lifetime, depending on the disease it’s protecting against. 

In someone who has survived infection with covid-19, the blood should, presumably, possess these antibodies, which will then protect against subsequent infection by the SARS-CoV-2 virus. Knowing whether someone is immune (and eligible for potential future certification) hinges on serological testing, drawing blood to look for signs of these antibodies. Get a positive test and, in theory, that person is now safe to walk the street again and get the economy moving. Simple.

Except it’s not. There are some serious problems with trying to use the tests to determine immunity status. For example, we still know very little about what human immunity to the disease looks like, how long it lasts, whether an immune response prevents reinfection, and whether you might still be contagious even after symptoms have dissipated and you’ve developed IgG antibodies. Immune responses vary greatly between patients, and we still don’t know why. Genetics could play a role.

“We’ve only known about this virus for four months,” says Donald Thea, a professor of global health at Boston University. “There’s a real paucity of data out there.” 

SARS-CoV-1, the virus that causes SARS and whose genome is about 76% similar to that of SARS-CoV-2, seems to elicit an immunity that lasts up to three years. Other coronaviruses that cause the common cold seem to elicit a far shorter immunity, although the data on that is limited—perhaps, says Thea, because there has been far less urgency to study them in such detail. It’s too early to tell right now where SARS-CoV-2 will fall in that time range. 

Even without that data, dozens of groups in the US and around the world are developing covid-19 tests for antibodies. Many of these are rapid tests that can be taken at the point of care or even at home, and deliver results in just a matter of minutes. One US company, Scanwell Health, has licensed a covid-19 antibody test from the Chinese company Innovita that can look for SARS-CoV-2 IgM and IgG antibodies through just a finger-prick blood sample and give results in 13 minutes. 

There are two key criteria we look for when we’re evaluating the accuracy of an antibody test. One is sensitivity, the ability to detect what it’s supposed to detect (in this case antibodies). The other is specificity, the ability to detect the particular antibodies it is looking for. Scanwell’s chief medical officer, Jack Jeng, says clinical trials in China showed that the Innovita test achieved 87.3% sensitivity and 100% specificity (these results are unpublished). That means it will not target the wrong kind of antibodies and won’t deliver any false positives (people incorrectly deemed immune), but it will not be able to tag any antibodies in 12.7% of all the samples it analyzes—those samples would come up as false negatives (people incorrectly deemed not immune).

By comparison, Cellex, which is the first company to get a rapid covid-19 antibody test approved by the FDA, has a sensitivity of 93.8% and a specificity of 95.6%. Others are also trumpeting their own tests’ vital stats. Jacky Zhang, chairman and CEO of Beroni Group, says his company’s antibody test has a sensitivity of 88.57%, for example. Allan Barbieri of Biomerica says his company’s test is over 90% sensitive. The Mayo Clinic is making available its own covid-19 serological test to look for IgG antibodies, which Elitza Theel, the clinic’s director of clinical microbiology, says has 95% specificity.

The specificity and sensitivity rates work a bit like opposing dials. Increased sensitivity can reduce specificity by a bit, because the test is better able to react with any antibodies in the sample, even ones you aren’t trying to look for. Increasing specificity can lower sensitivity, because the slightest differences in the molecular structure of the antibodies (which is normal) could prevent the test from finding those targets. 

“It really depends on what your purpose is,” says Robert Garry, a virologist at Tulane University. Sensitivity and specificity rates of 95% or higher, he says, are considered a high benchmark, but those numbers are difficult to hit; 90% is considered clinically useful, and 80 to 85% is epidemiologically useful. Higher rates are difficult to achieve for home testing kits. 

But the truth is, a test that is 95% accurate isn’t much use at all. Even the smallest errors can blow up over a large population. Let’s say coronavirus has infected 5% of the population. If you test a million people at random, you ought to find 50,000 positive results and 950,000 negative results. But if the test is 95% sensitive and specific, it test will correctly identify only 47,500 positive results and 902,500 negative results. That leaves 50,000 people who have a false result. That’s 2,500 people who are actually positive—immune—but are not getting an immunity passport and must stay home. That’s bad enough. But even worse is that a whopping 47,500 people who are actually negative—not immune—could incorrectly test positive. Half of the 95,000 people who are told they are immune and free to go about their business might never have been infected yet. 

Because we don’t know what the real infection rate is—1%, 3%, 5%, etc.—we don’t know how to truly predict what proportion of the immunity passports would be issued incorrectly. The lower the infection rate, the more devastating the effects of the antibody tests’ inaccuracies. The higher the infection rate, the more confident we can be that a positive result is real.

And people with false positive results would unwittingly be walking hazards who could become infected and spread the virus, whether they developed symptoms or not. A certification system would have to test people repeatedly for several weeks before they could be issued a passport to return to work—and even then, this would only reduce the risk, not eliminate it outright.

As mentioned, cross-reactivity with other antibodies, especially ones that target other coronaviruses, is another concern. “There are six different coronaviruses known to infect humans,” says Thea. “And it’s entirely possible if you got a garden-variety coronavirus infection in November, and you did not get covid-19, you could still test positive for the SARS-CoV-2 antibodies.” 

Lee Gehrke, a virologist and biotechnology researcher at Harvard and MIT, whose company E25Bio is also developing serological tests for covid-19, raises another issue. “It’s not yet immediately clear,” he says, “that the antibodies these tests pick up are neutralizing.” In other words, the antibodies detected in the test may not necessarily act against the virus to stop it and protect the body—they simply react to it, probably to tag the pathogen for destruction by other parts of the immune system. 

Gehrke says he favors starting with a smaller-scale, in-depth study of serum samples from confirmed patients that defines more closely what the neutralizing antibodies are. This would be an arduous trial, “but I think it would be much more reassuring to have this done in the US before we take serological testing to massive scale,” he says.

Alan Wells, the medical director of clinical laboratories at the University of Pittsburgh Medical Center, raises a similar point. He says that some patients who survive infection and are immune may simply not generate the antibodies you’re looking for. Or they may generate them at low levels that do not actually confer immunity, as some Chinese researchers claim to have found

“I would shudder to use IgM and IgG testing to figure out who’s immune and who’s not,” says Wells. “These tests are not ready for that.” 

Even if the technology is more accurate, it might still simply be too early to start certifying immunity just to open up the economy. Chris Murray from the University of Washington’s Institute for Health Metrics and Evaluation told NPR his group’s models predict that come June, “at least 95% of the US will still be susceptible to the virus,” leaving them vulnerable to infection by the time a possible second wave comes around in the winter. Granting immunity passports to less than 5% of the workforce may not be all that worthwhile. 

Theel says that instead of being used to issue individual immunity passports, serology tests could be deployed en masse, over a long period of time, to see if herd immunity has set in—lifting or easing restrictions wholesale after 60 to 70% of a community’s population tests positive for immunity. There are a few case studies that hold promise. San Miguel County in Colorado has partnered with biotech company United Biomedical in an attempt to serologically test everyone in the county. The community is small and isolated, and therefore easier to test comprehensively. Iceland has been doing the same thing across the country. 

This would require a massively organized effort to pull off well in highly populated areas, and it’s not clear whether the decentralized American health-care system could do it. But it’s probably worth thinking about if we hope to reopen whole economies, and not just give a few individuals a get-out-of-jail-free card. 

Not everyone is so skeptical about using serological testing on a case-by-case basis. Thea thinks the data right now suggests SARS-CoV-2 should behave like its close cousin SARS-CoV-1, resulting in an immunity that lasts for a maybe a couple of years. “With that in mind, it’s not unreasonable to identify individuals who are immune from reinfection,” he says. “We can have our cake and eat it too. We can begin to repopulate the workforce—most importantly the health-care workers.” For instance, in hard-hit cities like New York that are suffering from a shortage of health-care workers, a serological test could help nurses and doctors figure out who might be immune, and therefore better equipped to work in the ICU or conduct procedures that put them at a high risk of exposure to the virus, until a vaccine comes along. 

And at the very least, serological testing is potentially useful because many covid-19 cases present, at most, only mild symptoms that don’t require any kind of medical intervention. About 18% of infected passengers on the Diamond Princess cruise ship showed no symptoms whatsoever, suggesting there may be a huge number of asymptomatic cases. These people almost certainly aren’t being tested (CDC guidelines for covid-19 testing specifically exclude those without symptoms). But their bodies are still producing antibodies that should be detectable long after the infection is cleared. If they develop immunity to covid-19 that’s provable, then in theory, they could freely leave the house once again. 

For now, however, there are too many problems and unknowns to use antibody testing to decide who gets an immunity passport and who doesn’t. Countries now considering it might find out they will either have to accept enormous risks or simply sit tight for longer than initially hoped.

Correction: The initial version of the story incorrectly stated: “The higher the infection rate, the more devastating the effects of the antibody tests’ inaccuracies.A higher infection would actually produce more confident antibody test results. We regret the error.

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