The PHE study reported widely today shows that those who are vaccinated who still get infected are 40% to 50% less likely to pass it on to a household contact than those unvaccinated.
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khub.net/documents/1359…
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khub.net/documents/1359…
This is an important finding, as household setting transmission is more difficult to suppress through the interventions we are all familiar with, particularly in large multi-generational households.
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This benefit is on top of the lower risk in becoming infected, which is typically around 65% after a first dose (there isn't enough data on any further protection from a 2nd dose).
So the overall first dose effect in terms of protecting your family becomes around 85%.
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So the overall first dose effect in terms of protecting your family becomes around 85%.
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The paper notes that the age of the initial person who was infected the "index case", nor the age of the other household members didn't seem to make much difference to the benefit seen.
(Though older people are of course more at risk if they become infected.)
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(Though older people are of course more at risk if they become infected.)
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The effect was seen to kick in after around 14 days, (consistent with other studies showing the vaccine starts to offer protection against infection at that point), with the full benefit seen after 21+ days.
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It's also real-world evidence that supports the Oxford study last week that showed that those being infected had much lower levels of infection, and thus could be assumed to be much less infectious, giving transmission benefits.
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https://twitter.com/john_actuary/status/1385497821558853636
So the evidence is clear, getting a vaccine not only protects you, but also all those you live with, including any older generations for whom the result of infection is likely to be more serious.
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