“They still surprise us,” Dr. said. Conly. “I find this document interesting, but it must have been credible in my mind for a long time.”
George Rutherford, a professor of epidemiology at the University of California, San Francisco, was equally skeptical. He said that outside the hospital environment, “big drops in my mind are responsible for the vast majority of cases. Aerosol transmission – if you actually ride it, it creates a lot of discrepancies. Are there situations where this could occur? Yes, maybe, but it’s a small amount. “
Tang and other scientists strongly disagree. “If I talk to an infectious person for 15 or 20 minutes and inhale some of their air,” Dr. said. Tang, “Isn’t this a much easier way to explain the transmission, how to touch the infected surface and touch your eyes?” When you talk about a fireplace, for example in a restaurant, this seems like a torturous way to explain the transmission. “
frequently asked Questions
Updated July 27, 2020
Should I refinance my mortgage?
- It might be a good idea, because mortgage rates have never been lower. Refinancing applications have moved mortgage applications to the highest level since 2008, so be prepared for compliance. But the default values are also up, so if you’re considering buying a home, be aware that some lenders have tightened their standards.
What will the school look like in September?
- It is unlikely that many schools will return to a normal schedule this fall, which requires continuing online learning, temporary childcare and busy working days. California’s two largest public school districts, Los Angeles and San Diego, said on July 13 that distance learning would be limited in the fall, citing concerns that the sharp rise in coronavirus infections in their areas posed too great a risk for students and teachers. Approximately 825,000 students will enroll in these two districts. When reopened in August, they are so far the largest in the country to give up plans for a partial physical return to class. For other districts, an “all or nothing” solution will not be the solution. Many systems, including the largest in the state of New York, propose hybrid plans that include spending some days in class and others days online. There is no national policy in this regard yet, so check with your local school system regularly to find out what is going on in your community.
Is the coronavirus in the air?
- Coronavirus can stay up in the air in small droplets in the standing air, infecting people by inhalation, scientific evidence suggests. This risk is highest in crowded, poorly ventilated interiors and can help explain the extremely widespread events reported in meat production plants, churches and restaurants. It is not clear how often the virus spreads through these small droplets or aerosols compared to larger droplets that are eliminated when the patient coughs or sneezes or is transmitted by contact with contaminated surfaces, said Linsey Marr, an aerosol specialist at Virginia Tech. Aerosols are released even if the person is exhaling, talking or singing without symptoms. According to Dr. Marra and more than 200 other experts who presented this evidence in an open letter to the World Health Organization.
What are the symptoms of coronavirus?
Does Covid-19 become asymptomatic?
- So far, this evidence seems to prove it. A widely cited document published in April suggests that humans are most infectious about two days before the onset of coronavirus symptoms, and it is estimated that 44 percent of new infections were the result of transmission from people who did not yet show symptoms. A top expert from the World Health Organization recently said that coronavirus transmission to people without symptoms was “very rare”, but later returned to the statement.
In a new analysis, a team led by indoor air researcher Parham Azimi at the TH Chan Harvard School of Public Health studied the focus of diamonds, where physical spaces and infections were well documented. More than 20,000 simulations of how the virus could spread throughout the ship were performed. Each simulation made a number of assumptions about factors such as patterns of social interaction – how much time people spent in the cabin, on board or in the cafe, on average – and the amount of time the virus can live on surfaces. Each also took into account the different contributions of smaller floating droplets, which are generally defined as 10 microns or less; and larger drops that fall faster and infect surfaces or other persons, for example by landing on the eyes, mouth or nose.
About 130 of these simulations reproduced to some extent what actually happened to the diamond princess as the focus expanded. By analyzing these most realistic scenarios, the research team calculated the most likely contributions of each transmission pathway. The researchers concluded that smaller droplets predominated and accounted for about 60 percent of all new infections, in close proximity, a few meters from the infectious person, and at greater distances.
“A lot of people said there was an air transmission, but no one had numbers,” said Dr. Azimi. “What is the benefit of these little droplets – is it 5 percent or 90 percent?” In this document, we present the first real estimates of what the number could be, at least for this cruise ship. “
The logic of this transfer is clear, experts said. When someone speaks, it emits a cloud of droplets, the vast majority of which are small enough to remain in the air for a few minutes or longer. By inhalation, this cloud of small droplets is more likely to reach the mucus membrane than the larger ones, which rise ballistically.