Where did the new coronavirus originate, how did it spread so fast -- and what's next? Sharing insights from the outbreak, global health expert and TED Fellow Alanna Shaikh traces the spread of COVID-19, discusses why travel restrictions aren't effective and ...
Alice, Bob, Cindy, and Frank meet on July 3, 2020. Over the preceding week, on average 184,617 new Covid-19 infections per day have been reported worldwide, a 13% increase over the previous week. In the U.S., the corresponding increase has been 39%. The Fourth of July national ...
The virus most often spreads through people who have symptoms. But it is possible to pass it on without showing any signs. Some people who don't know they've been infected and never develop symptoms can give COVID-19 to others. This is called asymptomatic spread. You can also pass it o...
The virus most often spreads through people who have symptoms. But it is possible to pass it on without showing any signs. Some people who don't know they've been infected and never develop symptoms can give COVID-19 to others. This is called asymptomatic spread. You can also pass it o...
How long are you contagious with COVID-19? You are contagious and may spread the virus that causes COVID-19, at least 2 days before you show symptoms and for up to 10 days from the day you have your first symptom. The highest risk of transmitting the virus to someone else in the fe...
By analysing the genomes - or genetic 'map' - of the first 160 cases diagnosed in humans around the world, the researchers have mapped how the virus spread. They have also discovered there are three distinct family trees of COVID-19, a discovery which could hel...
So, deadly viruses like SARS does not spread as widely nor as fast. COVID-19 is not as deadly as we think, but highly infectious. During the 2009 flu season, tens of million were infected in the United States, but the mortality rate was 0.1% to 0.2%. The world was very scared at...
"COVID-19 can be spread by people who do not have symptoms and do not know that they are infected," the CDC says. But WHO notes that more data is needed to better understand transmission. "WHO is working with countries around the world, and global researchers, to gain better evidence-...
The WHO also opposed international travel restrictions that, if implemented earlier, might have slowed the international spread of the virus. By the time the PHEIC was declared, COVID-19 had spread to 18 countries outside China. But WHO's hands were tied ...
Whenever there’s a new outbreak, scientists rush to calculate a number called R0, or R-naught. Why? It’s been a critical part of the scientific effort to understand just how transmissible the new virus is. Here’s how. Editor’s Note (2/11/20): The vid