COVID news & more, 2/24/24
JN.1 continues to be the only variant causing COVID cases now. A new study confirmed that the XBB.1.5 vaccine is effective against JN.1. It turns out that responses to COVID vaccines are better than previously thought. Antibody formation after vaccination shows two phases: an initial rapid decrease (waning) in SARS-CoV-2 spike IgG antibodies, followed by stabilization of antibody levels for at least 7 to 9 months. This is consistent with typical B cell physiology.