4th Pfizer shot sparks fivefold antibody boost, Israeli study finds

Preliminary findings from Israel found people who received a fourth shot of Pfizer-BioNTech's COVID-19 vaccine had a fivefold increase in antibodies a week later, The Wall Street Journal reported Jan. 4.

Israeli Prime Minister Naftali Bennett announced the findings during a Jan. 4 news conference, saying the early results "demonstrate a much higher level of protection than without the fourth dose, both in relation to infection and the spread of the virus and in relation to severe morbidity.”