WActinomycosis
WChickenpox
WCOVID-19 pandemic
WCytomegalovirus
WCytomegalovirus
WHuman parainfluenza viruses
WRespiratory syncytial virus
WLegionnaires' disease
WMeasles
WMiddle East respiratory syndrome
WPneumocystis pneumonia
WPsittacosis
WQ fever
WRespiratory syncytial virus
WSevere acute respiratory syndrome
WTularemia