Pfizer and BioNTech announced Tuesday they have begun a clinical trial for their Omicron-specific COVID-19 vaccine.
The Omicron and Delta coronavirus variants account for the vast majority of COVID-19 cases – but how…
When it comes to the coronavirus, only one thing is certain, according to scientists – more variants…
Pfizer says a third vaccine shot would "strongly" boost protection against the highly contagious Delta variant.
The Delta variant of the novel coronavirus has taken over the U.S. in recent weeks. So why…