‘A man in the United States has caught Covid twice, with the second infection becoming far more dangerous than the first, doctors report. The 25-year-old needed hospital treatment after his lungs could not get enough oxygen into his body. Reinfections remain rare and he has now recovered. But the study in the Lancet Infectious Diseases raises questions about how much immunity can be built up to the virus.’
Read here (BBC, Oct 13, 2020)
