Quick update on the Florida long term care facility residents and staff. At this point, all residents and staff who wished to be vaccinated are at least a week past their second dose.
As of 3/6 there are 530 positive residents and 417 positive staff. On 1/18 there were 3,650 and 2,738 respectively. That represents a decrease of 85.5% in LTC residents and 84.8% in LTC staff from 1/18-3/7. Based on the data from worldometers.info, the seven day rolling average of the number of daily cases in FL declined 60.56% in the same period.
Since LTC staff are out in the community when not at work, the additional decline among that population can reasonably be attributed to the vaccinations and gives an idea of the effectiveness of the vaccines in preventing infections.
If not for the vaccinations, it can be expected that there would be 1,080 currently positive staff. Therefore, it appears that the vaccination program among this population has prevented 663 infections, making the vaccination program (at whatever the acceptance level was) approximately 61% effective in preventing infections. I wish there was a way to know what the acceptance rate of the vaccine was for LTC staff in FL because then we could calculate the effectiveness more accurately. For example, if the acceptance rate was 70% (a reasonable possibility based on the polls referenced by
@GoofGoof, it would indicate that the vaccines are 87% effective at preventing infections in the real world.
Caveat to this post, as I've said before, it isn't a perfect analysis because I'm using currently positive LTC data from staff tested at least every two weeks to daily case data in the general population but I would expect them to track pretty close.