There may be no immunity against Covid-19, new Wuhan study suggests | South China Morning Post

Wang’s team also suggested that more than 10 per cent of the people in their study may have lost antibody protection within a month or so.

“Our findings have important implications for herd immunity, antibody-based therapeutics, public health strategies, and vaccine development,” they said.

Based on their research, they said antibody tests may not be enough to tell whether someone had been infected, and the presence of antibodies like IgG may not necessarily provide immunity later.

“The idea of an immune certificate for recovered Covid-19 patients is invalid,” Wang wrote.

There may be no immunity against Covid-19, new Wuhan study suggests | South China Morning Post