WBourbon virus
WMosquito-borne disease
WAfrican trypanosomiasis
WBarmah Forest virus
WBluetongue disease
WBrugia
WBrugia malayi
WCanine leishmaniasis
WCarrion's disease
WChagas disease
WCutaneous leishmaniasis
WEpidemic typhus
WEquine encephalosis virus
WFilariasis
WList of West Nile virus outbreaks
WMalaria
WCharles Duncan Michener
WPappataci fever
WPlague (disease)
W1924 Los Angeles pneumonic plague outbreak
WPneumonic plague
WRift Valley fever
WSaint Louis encephalitis
WSepticemic plague
WSevere fever with thrombocytopenia syndrome
WTularemia
WVisceral leishmaniasis
WWest Nile fever
WWestern equine encephalitis virus
WWuchereria bancrofti
WZika fever
WZika virus