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airborne-transmission × 14covid-19 × 7
coronavirus × 4
disease-transmission × 4
infection × 3
common-cold × 3
epidemiology × 2
infectious-diseases × 2
face-mask-respirator × 2
medications × 1
virus × 1
statistics × 1
prevention × 1
risks × 1
sex × 1
lungs × 1
respiratory-system × 1
cough × 1
who-world-health-org × 1
nasal-cavity × 1
sexual-penetration × 1
vector × 1