A team of scientists, including some from Denmark’s Department of Infectious Disease Epidemiology and Prevention, noted that most people who have had Covid-19 seemed to have protection from reinfection that remained stable for more than six months. In the follow up after six months, the study didn’t find any evidence that protection was waning. But a check of the demographics of who was getting infected again showed it was mostly people 65 and older.
They looked at the reinfection rate among 4 million people during the second surge of Covid-19 from September through December 31, and compared this to the infection rate during the first surge between March and May. Of the 11,068 people who tested positive during the first surge, only 72 tested positive again during the second.
The older age group had only about 47% protection against repeat infection, compared to younger people who…
