Pfizer updated #Covid19#boosters re BA.1 buff.ly/3QQKV2z "Preliminary results suggest #vaccines could neutralize Omicron BA.4 & BA.5" If not, BA.4/5 and other emerging #variants may again have an INFECTION ADVANTAGE in VACCINATED amid still non-sterilizing #vaccines?!
Basics in Virology: "RNA viruses are unique in their evolutionary capacity, exhibiting high mutation rates and frequent recombination. They rapidly adapt to environmental changes, such as shifts in immune pressure or pharmacological challenge" annualreviews.org/doi/10.1146/an…
SARS-CoV-2 #Omicron BA.2.12.1, BA.4, and BA.5 subvariants evolved to extend antibody evasion buff.ly/38Mir92 Is this evolution due to increased evolutionary pressure by non-sterilizing #vaccines?
When the models actually seem to work: "Vaccine escape in a heterogeneous population: insights for SARS-CoV-2 from a simple model" royalsocietypublishing.org/doi/full/10.10…
What impact can BA.1/2 targetting #vaccines have on BA.4/5 "robust neutralisation evasion by BA.4 & BA.5 ... are immune-evasion variants, which are more adept than BA.1/2 to spread in populations that are vaccinated or recovering from #omicron, or both buff.ly/3NvrgC4
Bei 39.766 Mitarbeitern der Cleveland Clinic, bereits durch eine vorherige Infektion oder Impfung geschützt, war eine Auffrischimpfung nach 6 Monaten mit signifikant geringeren COVID-19-Risiko verbunden. Nach #COVID19-Infektion brachte mehr als eine Impfdosis keinen Vorteil.
Bei Personen mit natürlicher Immunität war die Verabreichung von 2 im Vergleich zu 1 Dosis des Impfstoffs mit einem höheren Risiko für #COVID19 verbunden (HR, 1,54; 95 % KI, 1,21–1,97).