A captive audience - were all the caregivers vaccinated? no? well then
In a Massachusetts nursing home close to 100% of the residents would have been vaccinated. If there is a 10% failure rate for the vaccine then you would need 330 and 420 exposed patients in the nursing homes respectively. Not just patients, patients that were exposed to COVID-19 long enough so that in the absence of the vaccine they would have been infected.
That seems pretty unlikely unless there is some kind of super spreader event going on in those nursing homes, or the nursing homes have very large populations.
Perhaps some research should be done to understand why widespread exposure to COVID-19 is happening in what should be fairly safe and isolated facilities.
I found a sort of recent article about Mass. Looks like the best they had for Covid vaccination in health care workers not doctors is 80% at Brigham. A Worcester nursing home at 70%. I wonder if MA mandated all health care workers be vaccinated since the below Feb article?
Delta has mutations that allow it to infect faster (used to be 15 minutes face to face, right? that’s out the window) and grow faster - 3.7 days to contageous with a higher viral load, ROI 5+ So 1 person infects 5 who infect 5 each. As opposed to original wuhan of 1 person infects 2 which infect 2. Which I think makes the virus itself a superspreader? One or two infected visitors or care staff or craft day person or delivery guy chatting with a resident and there’s 25 to 50 infected in less than 9 days.