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common-cold × 72immune-system × 12
infection × 10
influenza × 9
virus × 8
vaccination × 5
prevention × 5
nose × 5
covid-19 × 5
mucus-phlegm × 4
medications × 3
allergy × 3
symptoms × 3
cough × 3
coronavirus × 3
bacteria × 2
disease-transmission × 2
effectiveness × 2
clinical-study × 2
fever × 2
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epidemiology × 2
ears-nose-throat-ent × 2
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