by Marlowe HOOD Agence France-Presse PARIS, France (AFP) — Researchers in Hong Kong Monday identified what they said was the first confirmed case worldwide of COVID-19 reinfection, raising questions about the durability of immunity, whether acquired naturally or with a vaccine. “Our study proves that immunity for COVID infection is not lifelong — in fact, reinfection can occur quite quickly,” said Kelvin Kai-Wang To, a microbiologist at Hong Kong University’s Faculty of Medicine and lead […]