Source: New York Times
By Remy Tumin
Scientists have long said that giving people a single course of a Covid-19 vaccine might not be sufficient in the long term, and that booster shots and even annual vaccinations might prove necessary.
In recent days, that proposition has begun to sound less hypothetical.
Vaccine makers are getting a jump-start on possible new rounds of shots, although they sound more certain of the need for boosters than independent scientists have.
Pfizer’s chief executive said on Thursday that a third dose of the company’s Covid-19 vaccine would “likely” be needed within a year of the initial two-dose inoculation — followed by annual vaccinations.
“There are vaccines like polio where one dose is enough, and there are vaccines like flu that you need every year, ” Albert Bourla, the Pfizer chief, said in a conversation hosted by CVS Health. “The Covid virus looks more like the influenza virus than the polio virus.”