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immune-system × 200covid-19 × 49
vaccination × 49
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infection × 21
antibodies × 15
common-cold × 12
allergy × 11
autoimmune-disease × 11
medications × 8
disease-transmission × 7
bacteria × 7
influenza × 7
coronavirus × 6
infectious-diseases × 6
disease × 6
immunosuppressant × 6
cancer × 5
blood × 5
epidemiology × 5
sars-cov-2 × 5
inflammation × 5
nutrition × 4
fever × 4
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