2020-03-28, 12:39 AM
1. Coronavirus đã được thành hình ra sao? Và truyền như thế nào từ Vũ Hán ra khắp thế giới ?
2. Coronavirus có airborne không? Đây là một câu hỏi nhức nhối để thẩm định sự nguy hiểm của nó. Nếu Covid chỉ lây lan qua mặt bằng surface hay ho, nhảy mũi, thì nó chỉ nguy hiểm một phần, nhưng nếu Covid lây lan qua airborne, aerosol, lơ lững, thì nó sẽ nguy hiểm gấp nhiều lần.
So...is the novel coronavirus airborne?
The short answer is: maybe, but it's complicated. First, it's important to note that airborne can mean different things to different people, even experts. In general, a pathogen is considered airborne when it can spread via smaller particles that can remain in the air for long periods of time, says Natasha Bhuyan, MD, a specialist in infectious diseases and family physician in Phoenix, Arizona. The exact length of time that viral particles in general hang in the air before they dissipate depends on a variety of factors, including the temperature and humidity of the area, and so on, adds Rishi Desai, MD, a former epidemic intelligence service officer in the division of viral diseases at the CDC.
Now let's talk about COVID-19 specifically: When someone who has novel coronavirus coughs or sneezes, the tiny droplets that come out of their nose and mouth are like a tiny cloud of mist—and it’s possible that they linger, says Dr. Desai. Experts just don't know the concrete answer at this point for how long, be it a few seconds or more like hours.
In a new study published March 18 in the New England Journal of Medicine, researchers found that SARS-CoV-2 (the virus that causes the COVID-19 illness) remained stable (meaning: contagious) in aerosols, like droplets from coughing, for three hours. It's worth pointing out, though, that the experiments performed in this study (which also looked at SARS-CoV-2 viability on plastic, copper, and more, in addition to aerosols) were done in a highly controlled laboratory setting. But the authors concluded: "Our results indicate that aerosol ... transmission of SARS-CoV-2 is plausible, since the virus can remain viable and infectious in aerosols for hours."
Even if a mist of the novel coronavirus hangs around for hours where the person sprayed the droplets, it's still probable that the airborne particles are only reaching six feet from the point of origination, according to the latest information from the CDC. As the organization states, "airborne transmission from person-to-person over long distances is unlikely."
Dr. Bhuyan reiterates that message, saying you’re still most likely to catch it directly from an infected person when they cough or sneeze droplets containing viral particles, and those particles land on your face, body, or a nearby surface (where you could potentially pick them up and then touch your face, for example)—or you're close enough to breathe them in. And again, we’re talking pretty tight person-to-person contact. Remember, though: A person might not even know they have novel coronavirus because they're asymptomatic—and they can still transmit it via respiratory droplets. So your safest bet is staying six feet away from, well, pretty much everybody, as much as you can.
https://www.womenshealthmag.com/health/a...-airborne/
2. Coronavirus có airborne không? Đây là một câu hỏi nhức nhối để thẩm định sự nguy hiểm của nó. Nếu Covid chỉ lây lan qua mặt bằng surface hay ho, nhảy mũi, thì nó chỉ nguy hiểm một phần, nhưng nếu Covid lây lan qua airborne, aerosol, lơ lững, thì nó sẽ nguy hiểm gấp nhiều lần.
So...is the novel coronavirus airborne?
The short answer is: maybe, but it's complicated. First, it's important to note that airborne can mean different things to different people, even experts. In general, a pathogen is considered airborne when it can spread via smaller particles that can remain in the air for long periods of time, says Natasha Bhuyan, MD, a specialist in infectious diseases and family physician in Phoenix, Arizona. The exact length of time that viral particles in general hang in the air before they dissipate depends on a variety of factors, including the temperature and humidity of the area, and so on, adds Rishi Desai, MD, a former epidemic intelligence service officer in the division of viral diseases at the CDC.
Now let's talk about COVID-19 specifically: When someone who has novel coronavirus coughs or sneezes, the tiny droplets that come out of their nose and mouth are like a tiny cloud of mist—and it’s possible that they linger, says Dr. Desai. Experts just don't know the concrete answer at this point for how long, be it a few seconds or more like hours.
In a new study published March 18 in the New England Journal of Medicine, researchers found that SARS-CoV-2 (the virus that causes the COVID-19 illness) remained stable (meaning: contagious) in aerosols, like droplets from coughing, for three hours. It's worth pointing out, though, that the experiments performed in this study (which also looked at SARS-CoV-2 viability on plastic, copper, and more, in addition to aerosols) were done in a highly controlled laboratory setting. But the authors concluded: "Our results indicate that aerosol ... transmission of SARS-CoV-2 is plausible, since the virus can remain viable and infectious in aerosols for hours."
Even if a mist of the novel coronavirus hangs around for hours where the person sprayed the droplets, it's still probable that the airborne particles are only reaching six feet from the point of origination, according to the latest information from the CDC. As the organization states, "airborne transmission from person-to-person over long distances is unlikely."
Dr. Bhuyan reiterates that message, saying you’re still most likely to catch it directly from an infected person when they cough or sneeze droplets containing viral particles, and those particles land on your face, body, or a nearby surface (where you could potentially pick them up and then touch your face, for example)—or you're close enough to breathe them in. And again, we’re talking pretty tight person-to-person contact. Remember, though: A person might not even know they have novel coronavirus because they're asymptomatic—and they can still transmit it via respiratory droplets. So your safest bet is staying six feet away from, well, pretty much everybody, as much as you can.
https://www.womenshealthmag.com/health/a...-airborne/