A study in Denmark has found that people who were infected during the first surge of COVID-19 were unlikely to be reinfected during the second surge, but the risk of reinfection was higher for people older than 65. … Ethelberg and his colleagues found that out of nearly 17,000 people who were infected during the first wave of the coronavirus pandemic from March to May, only 72 people (about 0.7%) were reinfected during the second surge from September to December.