The US Food and Drug Administration on Thursday authorised a booster dose of Covid-19 vaccines from Pfizer Inc and Moderna Inc for people with compromised immune systems.
A few other countries, such as Israel and Germany, plan to or have already administered the third shot to avoid another crisis due to the contagious Delta variant of the coronavirus.
Moderna has also said it sees the eventual need for booster doses, especially since the Delta variant has caused “breakthrough” infections in fully vaccinated people. The World Health Organisation last week called for a moratorium on Covid-19 vaccine booster shots until at least the end of September.
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