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Comment by titzer | Hacker News Reader

Local outbreaks here among vaccinated family members and extended family members supports the emerging data that Delta spreads easily via vaccinated folks. The CDC recommendation for indoor mask wearing is motivated by data from Israel that was derived from testing vaccinated people without symptoms.

Delta is damn good at spreading, it seems. This sucks.

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> Delta is damn good at spreading, it seems. This sucks.

It does not appear to be as good at killing, though. Which is hopeful.

I remember reading that the ideal vaccine location for respiratory illness would be a nasal and lung aerosol so there would be a strong local immune response making it harder for any future infections to replicate effectively. Don’t know if that is still being looked at.

Just found this:

https://www.pbs.org/newshour/health/scientists-debate-potent...

It leads with this:

> Vaccines that are injected into arm muscles aren’t likely to be able to protect our nasal passages from marauding SARS-CoV-2 viruses for very long

It might be true, but I would have liked to read more. It's pretty easy to envision a case where that's not true, and the immune system doesn't really care where the vaccine was given.

Do you think these healthcare workers forgot to wear those masks?

Maybe it's not a binary thing?

Delta is not far from as contagious as measles - the most contagious disease known to man. Let that sink in for a while.

"Not far" is doing a lot of heavy lifting in this statement.

Measles is 3x (300%) more infectious than delta, even if you use the conservative values from Wikipedia

https://www.bbc.com/news/health-57431420

https://en.wikipedia.org/wiki/Basic_reproduction_number#cite...

I still stand by the statement. Three times as contagious sounds significantly worse that the herd immunity achieved with 85-90% vaccination for covid delta vs 93-95% for measles.

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