Conditional probability and imperfect vaccines II

Despite high coverage, an effective vaccine can still have breakthrough cases.

On 13th June, a MailOnline headline states:

Study shows 29% of the 42 people who have died after catching the new strain had BOTH vaccinations as cases soar another 40%

In Public Health England’s briefing on 25th June, 50 out of 117 Delta-related (B.1.117.2) deaths had two vaccine doses.