Corona virus reinfection...

[apcalc]

https://www.google.com/amp/s/www.nbcnews.com/news/amp/ncna1237840

[John Drake]

1. We're all gonna DIE!

From the linked article.

Iwasaki also noted that the man's immune system, while not enough to prevent reinfection, did appear to protect him from developing COVID-19, the disease caused by the coronavirus. The man's immune system also appeared to produce antibodies that aided in fighting the reinfection.

[apcalc]

5. Ah yes. I am interested to know how long so-called protection lasts.

[PSPS]

2. From the atricle, not uncommon with coronaviruses. He had no symptoms with the second infection.

So, as with other coronaviruses, there was a sufficient immune response to fight the symptoms. He would still have been infectious to others, though.

[Siwsan]

3. Not particularly surprising, since it's a virus.

Between 5 & 6% of the people who get shingles can develop it again.

No doubt some of the risk is due to the individual's immune system health.

[BusyBeingBest]

4. Slightly different strain got him the second time.

His immune system did kick in, too, so that's good.