The latest Covid-19 vaccines from Pfizer and Moderna tend to be exceptionally effective at avoiding severe illness.
More than 100,000 Americans are in COVID-19 hospital, while the nation has recorded its one-worst daily death toll since the pandemic began.
The CDC has updated its guidelines on the spread of COVID-19.
Public health authorities and drug manufacturers need to be open regarding the side effects of coronavirus vaccines, doctors say.
In an isolated laboratory at the Icahn School of Medicine in Mount Sinai, East Harlem, virologist Benjamin never has been able to decipher how the virus that causes COVID-19 assaults our immune system, wreaking havoc like no other virus he has ever examined.
It has been more than 300 days since Chinese authorities first told the World Health Organisation that Wuhan residents were sick with a mysterious virus.
One thing that we know about SARS-CoV-2 is that its effects on individuals differ.