Study : Pfizer Covid vaccine effective for 6 months
Pfizer’s coronavirus vaccine is 90% effective at preventing hospitalization, with no waning protection from hospital admission for up to six months, a new study found.
The researchers found that over the study period, effectiveness of the vaccine against all S-COV-2 infections declined, falling from 88 per cent within one month after receiving two vaccine doses to 47 per cent after six months.
The study found that vaccine effectiveness against Delta variant infections at one month after two doses of Pfizer was 93 per cent and fell to 53 per cent after 4 months.
The researchers noted that considerations for booster shots should take global Covid-19 vaccine supply into account as people in many countries around the world have not yet received a primary vaccination series.