Italy begins administering booster dose of COVID-19 vaccines using mRNA-based vaccines to people who are considered clinically vulnerable.
Singapore begins a nationwide campaign to administer booster doses of the COVID-19 vaccine for people over the age of 60 and people with a compromised immune system who received their second dose at least six months ago amid an increase in the number of COVID-19 cases.
The Singaporean health ministry will administer booster doses of the COVID-19 vaccine for people over the age of 60, people who are immunocompromised and residents of nursing home facilities beginning later this month.
The Czech government announces that the country will begin offering a booster dose of the COVID-19 vaccine from September 20 to all people who previously have been vaccinated at least eight months ago using either Pfizer or Moderna vaccines.
The Ministry of Health announces that Brazil will begin offering booster doses of the COVID-19 vaccine to immunocompromised people and people over the age of 70 who received their second dose more than six months ago and will also shorten the interval between the first and second doses of the Pfizer and AstraZeneca vaccines to eight weeks beginning in mid-September.
Serbia begins to administer booster doses of the COVID-19 vaccine for immunocompromised people, healthcare workers, people over the age of 70, people who frequently travel abroad, and people who have previously received their second dose at least six months ago.
The Cypriot Ministry of Health issues a new recommendation that people under the age of 50 should not receive the Oxford–AstraZeneca vaccine and should receive an mRNA vaccine instead. However, people under the age of 50 who have already received their first dose of the AstraZeneca vaccine should proceed normally with the second dose.
Italy invokes the European Union powers to block shipment of 250,700 doses of the Oxford–AstraZeneca vaccine to Australia amid escalations between the bloc and AstraZeneca. The European Commission endorses the move.