At the start it was not clear how quickly Covid-19 could spread, Brazil's ex-health minister says.
At the start it was not clear how quickly Covid-19 could spread, Brazil's ex-health minister says.
U.S. health and agriculture officials are ramping up testing and tracking of bird flu in dairy cows in an urgent effort to..
The creatures shed light on how new viruses might spread from animals to humans, researchers say.
The virus could spread more easily than the strain which ripped through parts of the UK and kills one in 10 people it infects