Two weeks after the third dose (booster) of the BNT162b2 vaccine, the median neutralizing antibody titers increased substantially to 6539 for WA1/2020, 1066 for BA.1, and 776 for BA.2, indicating ...

In the likeliest scenario, BA.1, BA.2 and a third Omicron subvariant that never took off—BA.3—evolved over the course of chronic infections in a small population of immune-compromised people.

A booster dose of mRNA-1273 after the initial two-dose vaccination resulted in neutralization titers against the BA.2.75 variant that were similar to those against BA.1 and BA.2 and higher than tho ...

Why BA.2.75.2 is worrying public health officials BA.2.75.2 has picked up three additional mutations from BA.2.75, two of which are where the virus binds to human cells in order to infect them.