Attention to the Unseen

The Guardian reports: Four Covid-19 sniffer dogs have begun work at Helsinki airport in a state-funded pilot scheme that Finnish researchers hope will provide a cheap, fast and effective alternative method of testing people for the virus. A dog is capable of detecting the presence of the coronavirus within 10 seconds and the entire process takes less than a minute to complete, according to Anna Hielm-Björkman of the University of Helsinki, who is overseeing the trial. “It’s very promising,” said…

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Andrew Joseph writes: Think back through the pandemic. Think about the moments that stand out as beacons in the haze — signposts of how it would change all of our lives. Not all of these moments were clear at the time. China’s decision to shut down cities of millions of people in January was staggering, but to most Americans, this new coronavirus remained an ocean away, not something that would demand our own version of a lockdown. Other moments form…

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The New York Times reports: Some of the nation’s leading public health experts are raising a new concern in the endless debate over coronavirus testing in the United States: The standard tests are diagnosing huge numbers of people who may be carrying relatively insignificant amounts of the virus. Most of these people are not likely to be contagious, and identifying them may contribute to bottlenecks that prevent those who are contagious from being found in time. But researchers say the…

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STAT reports: Following the news this week of what appears to have been the first confirmed case of a Covid-19 reinfection, other researchers have been coming forward with their own reports. One in Belgium, another in the Netherlands. And now, one in Nevada. What caught experts’ attention about the case of the 25-year-old Reno man was not that he appears to have contracted SARS-CoV-2 (the name of the virus that causes Covid-19) a second time. Rather, it’s that his second…

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The Washington Post reports: As 5,000 students prepared for move-in day at the University of Arizona this week, the school warned they would be tested periodically for the coronavirus. One test, though, doesn’t involve a nose swab. The university is regularly screening the sewage from each dorm, searching for traces of the virus. On Thursday, officials said the technique worked — and possibly prevented a sizable outbreak on campus. When a wastewater sample from one dorm came back positive this…

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When people wear masks, they can still get infected, but they’re more likely to have milder symptoms. Wenmei Zhou/Digital Vision Vectors via Getty Images By Monica Gandhi, University of California, San Francisco Masks slow the spread of SARS-CoV-2 by reducing how much infected people spray the virus into the environment around them when they cough or talk. Evidence from laboratory experiments, hospitals and whole countries show that masks work, and the Centers for Disease Control and Prevention recommends face coverings…

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The New York Times reports: New York City on Tuesday released more than 1.46 million coronavirus antibody test results, the largest number to date, providing more evidence of how the virus penetrated deeply into some lower-income communities while passing more lightly across affluent parts of the city. In one ZIP code in Queens, more than 50 percent of people who had gotten tested were found to have antibodies, a strikingly high rate. But no ZIP code south of 96th Street…

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CNN reports: A recent batch of studies, many early stage and not yet peer reviewed, show that humans have a “robust” immune response to Covid-19 that may protect them from further infection, even if they had mild symptoms. How long that protection lasts is still unclear, but the studies indicate it could last for months. One leading immunologist says the findings provide optimism that people will not have to endure repeated coronavirus infections. It also provides evidence a vaccine might…

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Open windows are the easiest way to ventilate a room. Justin Paget / Digital Vision via Getty Images By Shelly Miller, University of Colorado Boulder The vast majority of SARS-CoV-2 transmission occurs indoors, most of it from the inhalation of airborne particles that contain the coronavirus. The best way to prevent the virus from spreading in a home or business would be to simply keep infected people away. But this is hard to do when an estimated 40% of cases…

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MIT Technology Review reports: The large number of people already infected with the coronavirus in the US has begun to act as a brake on the spread of the disease in hard-hit states. Millions of US residents have been infected by the virus that causes covid-19, and at least 160,000 are dead. One effect is that the pool of susceptible individuals has been depleted in many areas. After infection, it’s believed, people become immune (at least for months), so they…

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