"A study from Shanghai that was posted recently to MedRxiv, a preprint server (and is thus not yet peer reviewed) examined blood samples taken from 175 people with mild cases of covid-19. They found that most patients developed neutralising antibodies 10-15 days after the onset of illness, though the amounts of these varied greatly. Intriguingly, however, ten people never had detectable antibodies in their blood, yet nonetheless managed to clear their infections. This suggests that other components of immunity, most likely the T-cell response, are indeed crucial." [1]
1. "Uncertainty's principals; Covid-19 and the immune system." The Economist, vol. 435, no. 9192, 2 May 2020, p. 68(US).
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