海外では２回目から追加接種、6ヶ月より短い場合も。

３回目接種へ間隔前倒し、厚労相は慎重…「６か月より短い接種は十分な治験がされていない」
2022/02/04 1

Au

 Interval between second and third dose reduced to three months nationally - with four million now eligible for booster shot

A change to the interval between the second and third dose of the COVID-19 vaccine has resulted in more than four million Australians becoming eligible for the booster shot.   

COVID booster shot intervals to be slashed in response to Omicron variant

By political reporter Georgia Hitch

Posted Fri 24 Dec 2021 a

By the end of January people will only have to wait three months after their second dose for a booster

New evidence shows the vaccine's protection against severe disease is less with the Omicron variant

The changes mean 16 million people will be eligible for a booster by the end of January

 COVID-19 vaccination in Australia

NZ

Vaccine booster interval shortened to three months - New Zealand government

2:28 pm on 2 February 2022 

Published January 4

COVID-19 vaccination in New Zealand

UK

Booster dose of the coronavirus (COVID-19) vaccine

Who can get a COVID-19 booster dose

Everyone aged 16 and over who had a 2nd dose of the COVID-19 vaccine at least 3 months ago can get a booster dose.

U.S.A.

Period between second Moderna COVID-19 vaccine shot, booster remains 6 months: FDA

"Right now if you got J&J, you get a booster after two months. If you got Pfizer as your primary series, you can get a booster at five months or beyond. If you got Moderna, you can get a booster at six months or beyond. Whatever you decide to get a booster of," acting FDA Commissioner Janet Woodcock said in a call with reporters.