Get CNN Health's weekly newsletter Sign up here to get The Results Are In with Dr. Sanjay Gupta every Tuesday from the CNN Health team. But such speculation needs to be tested  we cant just rely on an educated guess. However, data were still being collected in randomized controlled trials  the gold standard  to study the safety and effectiveness of the treatment. Prof Paul Morgan, the director of the Systems Immunity Research Institute at Cardiff University and a member of the British Society for Immunologys expert taskforce on immunology and Covid-19, said there were other reasons for optimism. The research involved 464 adults with moderate Covid-19 who were admitted to hospitals in India between April and July.
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