@Glennn,
Glennn wrote:You understand that the experimental injection does not prevent transmission.
Yes. Delta apparently allows the virus to build up in the throat, beyond the reach of the immune system. That allows people who are immune to Covid to still act as carriers and spread it to other people.
Glennn wrote:So, what study have you seen that proves an eighty percent reduction in the possibility of becoming infected?
I have not read any studies. I have only read a summary by the CDC. I presume that there is a study somewhere that justifies the summary however.
This CDC page says the vaccine makes you 6.1 times less likely to contract Covid, and 11.3 times less likely to die from Covid:
https://covid.cdc.gov/covid-data-tracker/#rates-by-vaccine-status
To make the math easier I rounded those numbers to five (leading to my 80% figure) and ten (leading to my 90% figure).
The CDC also made this handy graphic:
https://www.cdc.gov/mmwr/volumes/70/wr/social-media/mm7037e1_HospitalizationDeathVaccineStatus_IMAGE_10Sept21_1200x675-large.jpg
Glennn wrote:Of course, since the flu had all but disappeared, anyone who had a viral infection probably had covid, and now have natural immunity. Perhaps you've experienced such an infection and thereby acquired natural immunity without even knowing it.
It is very possible. I had a brief illness (with a high fever for half a day) after I attended a concert (the symphony orchestra kind, not the rock kind) at a private college. It was quite early in the pandemic before it was supposed to have spread very far in the US, but there were probably foreign students at the college that may well have brought it into the US without anyone realizing it.
But my immunity from that, if that is what it was, had long since diminished by the time the first vaccines became available.