The American pharmaceutical corporation Pfizer has recently announced that a third dose of their vaccine might be required. They are currently issuing a two dose vaccine, but CEO Albert Bourla stated that a third dose might be required which would be administered from within six months to one year. He also added that after the third dose, the vaccine might need to be administered every year.
Length of protection by the vaccine against COVID-19 is still unknown and a recent Pfizer study concluded that it is 91% effective against contracting the virus and 95% effective against sever illness up to six months after second dose. More research is needed to establish whether the vaccine is effective after six months.
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