WHO warns Covid reinfections may occur as data suggests antibodies wane - CNBC

World Health Organization officials on Friday warned that recent data suggests that, though it is rare, people who were once infected with the coronavirus could be infected again as their antibody response wanes.

Maria Van Kerkhove, head of the WHO's emerging diseases and zoonosis unit, said that researchers are still trying to determine how long an antibody response lasts after someone is infected with the virus.

"What we understand is 90[%] to 100% of people who are infected with the coronavirus do develop an antibody response, whether you have mild infection, asymptomatic infection, all the way to severe infection," she said.

"In some people, it may wane after a few months, but we do get a good indication that natural infection immune response is lasting for some months," Van Kerkhove said.