This gives our companies, our employees great peace of mind because they know that everybody thats coming into the laboratory to do the research is negative, Dr. Kathiresan said. So its an expense that is well worth it.

He said he expected employee-testing costs to decrease significantly over time as home self-collection kits, which allow people to swab their own noses or collect saliva samples and then send them to labs, became more available.

Updated June 22, 2020

A commentary published this month on the website of the British Journal of Sports Medicine points out that covering your face during exercise comes with issues of potential breathing restriction and discomfort and requires balancing benefits versus possible adverse events. Masks do alter exercise, says Cedric X. Bryant, the president and chief science officer of the American Council on Exercise, a nonprofit organization that funds exercise research and certifies fitness professionals. In my personal experience, he says, heart rates are higher at the same relative intensity when you wear a mask. Some people also could experience lightheadedness during familiar workouts while masked, says Len Kravitz, a professor of exercise science at the University of New Mexico.

The steroid, dexamethasone, is the first treatment shown to reduce mortality in severely ill patients, according to scientists in Britain. The drug appears to reduce inflammation caused by the immune system, protecting the tissues. In the study, dexamethasone reduced deaths of patients on ventilators by one-third, and deaths of patients on oxygen by one-fifth.

The coronavirus emergency relief package gives many American workers paid leave if they need to take time off because of the virus. It gives qualified workers two weeks of paid sick leave if they are ill, quarantined or seeking diagnosis or preventive care for coronavirus, or if they are caring for sick family members. It gives 12 weeks of paid leave to people caring for children whose schools are closed or whose child care provider is unavailable because of the coronavirus. It is the first time the United States has had widespread federally mandated paid leave, and includes people who dont typically get such benefits, like part-time and gig economy workers. But the measure excludes at least half of private-sector workers, including those at the countrys largest employers, and gives small employers significant leeway to deny leave.

So far, the evidence seems to show it does. A widely cited paper published in April suggests that people are most infectious about two days before the onset of coronavirus symptoms and estimated that 44 percent of new infections were a result of transmission from people who were not yet showing symptoms. Recently, a top expert at the World Health Organization stated that transmission of the coronavirus by people who did not have symptoms was very rare, but she later walked back that statement.

Touching contaminated objects and then infecting ourselves with the germs is not typically how the virus spreads. But it can happen. A number of studies of flu, rhinovirus, coronavirus and other microbes have shown that respiratory illnesses, including the new coronavirus, can spread by touching contaminated surfaces, particularly in places like day care centers, offices and hospitals. But a long chain of events has to happen for the disease to spread that way. The best way to protect yourself from coronavirus whether its surface transmission or close human contact is still social distancing, washing your hands, not touching your face and wearing masks.

A study by European scientists is the first to document a strong statistical link between genetic variations and Covid-19, the illness caused by the coronavirus. Having Type A blood was linked to a 50 percent increase in the likelihood that a patient would need to get oxygen or to go on a ventilator, according to the new study.

The unemployment rate fell to 13.3 percent in May, the Labor Department said on June 5, an unexpected improvement in the nations job market as hiring rebounded faster than economists expected. Economists had forecast the unemployment rate to increase to as much as 20 percent, after it hit 14.7 percent in April, which was the highest since the government began keeping official statistics after World War II. But the unemployment rate dipped instead, with employers adding 2.5 million jobs, after more than 20 million jobs were lost in April.

States are reopening bit by bit. This means that more public spaces are available for use and more and more businesses are being allowed to open again. The federal government is largely leaving the decision up to states, and some state leaders are leaving the decision up to local authorities. Even if you arent being told to stay at home, its still a good idea to limit trips outside and your interaction with other people.

Common symptoms include fever, a dry cough, fatigue and difficulty breathing or shortness of breath. Some of these symptoms overlap with those of the flu, making detection difficult, but runny noses and stuffy sinuses are less common. The C.D.C. has also added chills, muscle pain, sore throat, headache and a new loss of the sense of taste or smell as symptoms to look out for. Most people fall ill five to seven days after exposure, but symptoms may appear in as few as two days or as many as 14 days.

If air travel is unavoidable, there are some steps you can take to protect yourself. Most important: Wash your hands often, and stop touching your face. If possible, choose a window seat. A study from Emory University found that during flu season, the safest place to sit on a plane is by a window, as people sitting in window seats had less contact with potentially sick people. Disinfect hard surfaces. When you get to your seat and your hands are clean, use disinfecting wipes to clean the hard surfaces at your seat like the head and arm rest, the seatbelt buckle, the remote, screen, seat back pocket and the tray table. If the seat is hard and nonporous or leather or pleather, you can wipe that down, too. (Using wipes on upholstered seats could lead to a wet seat and spreading of germs rather than killing them.)

If youve been exposed to the coronavirus or think you have, and have a fever or symptoms like a cough or difficulty breathing, call a doctor. They should give you advice on whether you should be tested, how to get tested, and how to seek medical treatment without potentially infecting or exposing others.

Federal health authorities, however, have so far provided little guidance for businesses on testing employees for coronavirus.

In late May, the Centers for Disease Control and Prevention published guidelines on Resuming Business, which recommended that employers prepare a plan for conducting daily in-person or virtual health checks (e.g., symptom and/or temperature screening) before employees enter the facility. But the guidelines mentioned employee testing for the virus only in passing.

One concern is that the diagnostic tests could give employees a false sense of security, public health experts said. Because the virus can take several days to develop, they said, the time between taking a test and getting the lab results back could cause some employees who have the virus to receive false negative test results. Despite comprehensive testing, for instance, a group of Army recruits and instructors at Fort Benning, Ga., recently suffered a major outbreak of the virus.

Another concern is that scaling employee-testing programs nationwide could lead to unnecessary medical screening particularly for workplaces where employees, wearing masks, can be spaced far enough apart to adhere to social-distancing guidelines and might overwhelm labs that are running more urgent coronavirus tests for patients with serious symptoms. And some employees may object to being required to take medical tests and have the results automatically sent to their employers.

Dr. Lee, the Verily executive, said the company would consult with employers to tailor virus testing and workplace safety protocols to the number of their employees, workplace locations, the prevalence of coronavirus in the local community and the type of work employees performed.

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Big Tech Zeros In on the Virus-Testing Market - The New York Times