![Booster shots approved for those 18+ who were vaccinated with second dose of Astrazeneca (Covishield) at least six months ago | The official website for the latest health developments, Kingdom of Bahrain Booster shots approved for those 18+ who were vaccinated with second dose of Astrazeneca (Covishield) at least six months ago | The official website for the latest health developments, Kingdom of Bahrain](https://www.moh.gov.bh/Content/Upload/Image/637665670061043204-BD827859-3614-4CDF-BBF7-34F65BF98AE2.jpeg)
Booster shots approved for those 18+ who were vaccinated with second dose of Astrazeneca (Covishield) at least six months ago | The official website for the latest health developments, Kingdom of Bahrain
Mahidol University - Registration for Booster Dose (COVID-19 Vaccine: AstraZeneca) Only for Mahidol University Students and Staff Members who are completely vaccinated with 2 doses of Sinovac before July 2021 Registration opens
![Single-dose administration and the influence of the timing of the booster dose on immunogenicity and efficacy of ChAdOx1 nCoV-19 (AZD1222) vaccine: a pooled analysis of four randomised trials - The Lancet Single-dose administration and the influence of the timing of the booster dose on immunogenicity and efficacy of ChAdOx1 nCoV-19 (AZD1222) vaccine: a pooled analysis of four randomised trials - The Lancet](https://www.thelancet.com/cms/attachment/db5c63dc-ee49-4b78-b05c-e93ffa8229af/gr1_lrg.jpg)