Hah. People who recovered from SARS (the 2003 one!) showed immune response (T cells) to SARS even after 17 years. (May or may not apply to SARS-CoV-2 but interesting). https://www.nature.com/articles/s41586-020-2550-z …pic.twitter.com/yW3G0gJnol
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There is no massive reinfection in Brazil.
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