What you need to know besides only 17% The most important message we’re trying to send out now is that for those of us who were early adopters of the bivalent vaccine, it may be time for a second bivalent booster. The previous boosters for mRNA are not holding up as well after six months as far as protection against severe illness and hospitalization. https://www.houstonchronicle.com/lifestyle/renew-houston/health/article/dr-peter-hotez-covid-xbb-1-16-boosters-17919571.php