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DW-Science reporter Derrick Williams explains there's no precise data on the number of asymptomatic COVID cases. One problem is the highly infectious Omicron variant - people might not even notice they have it, but can still pass it on to others

DW science correspondent Derrick Williams answers the question: how long should a person wait after having COVID-19 to get vaccinated in order to boost their immunity?

DW science correspondent Derrick Williams has been keeping you informed of latest developments during the pandemic. This time he answers the viewer question: does the Delta variant still exist or was it eliminated by the Omicron variant?

DW science correspondent Derrick Williams keeps you up to date with the latest research and facts. This time he answers the question: Could SARS-CoV-2 be modified into a "light" version of the virus that's more harmless?

DW science correspondent Derrick Williams has been monitoring the pandemic since it began. He's looked at whether individuals can protect themselves against COVID-19 even if others are no longer being careful.

Very rarely, a currently approved covid vaccine can cause someone to go into anaphylactic shock, or develop a thrombosis. But there’s nothing indicating any wide-scale trends or delayed-term effects for any of the approved Covid vaccines.

Hundreds of types of coronavirus have been identified and many more are out there, but the ones that interest us most are the ones that infect us – known as the human coronaviruses. Seven of have been identified so far.

Breaking down COVID patients into percentages of vaccinated and unvaccinated is proving to be difficult. But data from different countries suggest vaccines offer good protection from severe disease.

For instance the bacteria that cause tuberculosis and syphilis have been infecting humans for hundreds of years. Obviously other factors can influence the evolutionary directions pathogens take, and from our perspective, trying to define what’s good for one is tricky

In scientific literature, the term is often applied to people who recovered after having been hospitalized with COVID-19. But some argue even who've recovered from even a mild case should be classed as survivors.