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virus × 214covid-19 × 84
immune-system × 42
vaccination × 34
infection × 32
infectious-diseases × 28
coronavirus × 23
disease-transmission × 22
epidemiology × 16
bacteria × 16
common-cold × 10
influenza × 10
sars-cov-2 × 9
disease × 9
test × 6
hpv × 6
medications × 5
symptoms × 5
statistics × 4
food-safety × 4
prevention × 4
lungs × 4
antibodies × 4
hiv × 4
disinfection × 4