A Johns Hopkins Medicine study finds booster doses of bivalent mRNA COVID-19 vaccines given every three to six months helps maintain a person’s ability to neutralize multiple SARS-CoV-2 strains, including XBB.1.5. Credit: Public Domain Image People who have received solid organ transplants and take immunosuppressant medications to prevent rejection are among those most susceptible to the damaging effects of COVID-19, including breakthrough infections, severe illness, hospitalization and death. Particularly dangerous for them has been the XBB.1.5 subvariant of the omicron strain of SARS-CoV-2, the virus that causes COVID-19. That’s because Read More