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Illustration showing the impact of healthy and unhealthy microbiota on respiratory tract infection. The complex relationship via gut-lung axis might be crucial in determining the vulnerability of respiratory tract to COVID-19, as an outcome of potential variation and crosstalk between (A) healthy gut microbiota with occurrence of fewer Bacteriodetes and (B) respiratory microbiota with prevalence of more Klebsiella and Ruthia sps in virus infected alveolus.
