“We have surprises all the time,” said Dr. Conly. “This document seems interesting to me, but I think it took a long time to get to the line of trust.”
Dr. George Rutherford, a professor of epidemiology at the University of California at San Francisco, was also skeptical. He said that despite the hospital, “most cases in my head consist of large drops. Aerosol transfer – if you actually run with it, it creates a lot of dissonance. Are there situations where this can happen? Yes, maybe, but it’s a small amount. “
Dr. Tang and other scholars strongly disagree. “If I talk to an infectious person for 15-20 minutes and inhale some of their air,” said Dr. Tang, “isn’t this a much simpler way to explain transmission than touching an infected surface and touching the eyes? When you talk about an outbreak in a restaurant like the latter, the latter seems like a torturous way to explain the infection. “
Outbreak of coronavirus>
frequently asked Questions
Updated for 2020 July 27
Should I refinance my mortgage?
- This may be a good idea because mortgage rates have never been lower. Due to refinancing applications, mortgage applications have reached their highest level since 2008, so be prepared to join. But default is also on the rise, so if you’re thinking about buying a home, keep in mind that some lenders have tightened their standards.
What will the school look like in September?
- It is unlikely that many schools will return to their normal schedule this fall, so there will be a need to continue online learning, to facilitate childcare and crushing working days. The two largest California public school districts – Los Angeles and San Diego – on July 13th. The instruction is said to be remote only in the fall, highlighting concerns that coronavirus infections in their area pose an excessive risk to students and teachers. About 825,000 students study together in the two districts. They are the largest in the country so far, abandoning plans to even partially physically return to classes when they reopen in August. In other areas, the solution will not be an all-or-nothing approach. Many systems, including the country’s largest New York, are developing hybrid plans for spending a few days in class and other days online. There is no national policy yet, so check your municipal school system regularly to see what’s going on in your community.
Is the coronavirus in the air?
- Coronavirus can stand for several hours in small droplets in stagnant air, infecting humans by inhalation, strong scientific evidence suggests. This risk is greatest in crowded indoor spaces where ventilation is poor, and this may help explain the particularly prevalent events reported in meat packing plants, churches, and restaurants. It is not known how often the virus is spread by these small droplets or aerosols compared to larger droplets that are released when a sick person coughs or sneezes or is transmitted through contact with contaminated surfaces, said Linsey Marr, an aerosol expert at Virginia Tech. Aerosols are released even when an asymptomatic person exhales, talks, or sings, says Dr. Marr and more than 200 other experts who set out the evidence in an open letter to the World Health Organization.
What are the symptoms of coronavirus?
Is there an asymptomatic transmission of Covid-19?
- So far, the evidence seems to suggest. A widely cited publication published in April states that people are most infected two days before the onset of coronavirus symptoms, and it is estimated that 44 percent of new infections were transmitted from people who have not yet shown symptoms. Recently, a top expert from the World Health Organization said that coronavirus was transmitted “very rarely” to people who had no symptoms, but she later rejected the claim.
In a new analysis, a team led by Parham Azimi, an indoor air researcher at Harvard TH Chan School of Public Health, investigated the Diamond Princess outbreak, where physical spaces and infections were well documented. More than 20,000 models were conducted of how the virus could have spread across the ship. Each simulation made different assumptions about factors such as social interaction models – the average time people spent in cabins, on the deck, or in a coffee shop, and how long the virus could live on surfaces. Each also reflects a variety of contributions from smaller, floating droplets, broadly defined as 10 microns or less; and larger drops that fall faster and infect surfaces or other people, say, on the eyes, mouth, or nose.
About 130 of these simulations to some extent replicated what actually happened in the Diamond Princess as the outbreak progressed. By analyzing these “most realistic” scenarios, the research team calculated the most likely contribution for each transmission route. The researchers concluded that smaller droplets predominated and accounted for about 60 percent of new infections both near, within a few yards of the infected person, and over greater distances.
“A lot of people said the transfer of the aircraft was going on, but no one had it,” said Dr. Azimi. “What is the contribution of these small droplets – is it 5 percent or 90 percent? In this paper, we provide the first real estimates of what this number could be, at least for this cruise ship. “
According to experts, the logic of such a transfer is straightforward. When a person speaks, he emits a cloud of droplets, the vast majority of which are small enough to remain suspended in the air for a few minutes or longer. When inhaled, those small droplet clouds reach the mucosa faster than larger, ballistic ones.