[lukeasrodgers]

Interesting, I never bothered to investigate the basis of that claim. According to https://www.nature.com/articles/d41586-022-02328-0, a recent study does show that the vaccine was effective at preventing the spread, which is unsurprising to me. What is surprising is that the article claims this was the first study of the effectiveness against spreading an infection.

[tomp]

> those who received at least one vaccine shot were 24% less likely to infect close contacts

At best you could claim “reducing the spread” (but marginally) and in now way “preventing”.

[z7]

Another study from March:

>protection waned to around 10% after only 4–6 months

https://www.nature.com/articles/d41586-022-00775-3

It would only be a measure of postponing some of the rising transmission rates if people don't get boosted every few months. Also it would have to be compared against the effects of natural immunity.