The article that you linked in post#56, actually presents a strong case overall, for powerful immunity resulting from natural COVID infections.
The few (3, 5) isolated cases of likely extremely frail and elderly nursing home patients testing positive for reinfection however, is more anecdotal.
That study only measured immunity for 90 days. I would have expected all covid cases to offer at least 90 days of immunity, but in this study it did not. At 90 days .03% of the previously infected tested positive again.
Only 3% of people who had not previously had covid tested positive.
And the numbers from the nursing home study which was an entirely different study were particularly disappointing. Out of 12 people who had covid in July, 5 of them had it again in October and in each case they had a worse case.
We’ll have to agree to disagree on what “powerful immunity” is...:-)
New Danish study just out.
“The vast majority of people who recover from Covid-19 remain shielded from the virus for at least six months, researchers reported on Wednesday in a large study from Denmark.”
“People over 65 are more likely to experience a second bout with the virus, according to a large study of medical records.”
“Prior infection with the coronavirus reduced the chances of a second bout by about 80 percent in people under 65, but only by about half in those older than 65.”