Psidium guajava L., Myrtaceae, is used widely in traditional medicine for the treatment of diarrhoea,
dysentery, gastroenteritis, stomachaches, and indigestion. However, the effect of the leaf extract of P. guajava on the
pathogenesis of infectious diarrhoea has not been studied. The present study evaluates the effect of a hot aqueous
extract (decoction) of dried leaves of P. guajava on parameters associated with pathogenicity of infectious diarrhoea.
The aim was to understand its possible mechanism(s) of action in controlling infectious diarrhoea and compare it with
quercetin, one of the most reported active constituents of P. guajava with antidiarrhoeal activity.