Scientists say there is no evidence that the BA.5 version of the Omicron coronavirus variant is more transmissible than measles, or that it has a basic reproduction number, or "R-naught" (R0), of 18.6 ...

The reproduction number 𝑅 is a key indicator used to monitor the dynamics of Covid-19 and to assess the effects of infection control strategies that frequently have high social and economic costs.

We published an article earlier this month that contained incorrect estimates for the basic reproduction number (R0) for COVID subvariants BA.4/BA.5 and BA.2. We have now corrected the error, but I ...

Among the well-known diseases, measles and chickenpox are two of the most infectious. But how does their contagiousness compare to the Delta variant of SARS-CoV-2 that is now causing the majority of ...

There are over 175 Covid-19 vaccines in development. Almost all government strategies for dealing with the coronavirus pandemic are based on the idea that one of these vaccine candidates will ...