Nearly nine months after the first infection with the novel coronavirus, we have very poor evidence for reinfection. This appears to be the case with the Hong Kong patient, who did not present any symptoms of the second infection, which was discovered following routine testing at the airport. A more interesting question is, was he contagious during his asymptomatic second infection? Therefore vaccination is critical to induce and sustain protective immune responses in the long term. Vaccination can elicit more potent and longer-lasting immune responses compared with natural infection, and these can be sustained by booster vaccinations when necessary.

Source: The Guardian August 27, 2020 02:15 UTC