Claim: Vaccines prevent transmission of the Delta variant of Covid-19 for only eight weeks.
Fact-check: Doctor who challenged Sajid Javid made misleading claims about vaccines - Full Fact
Verdict: it's difficult to measure the effect of vaccines on transmission, but available evidence suggests it's longer than eight weeks and boosters are likely to increase that protection.
Organisation: Full Fact
Author: Tom Norton
Date published: 2022-01-13T00:00:00