Effect of the combination of valacyclovir and clean feeding system on SGH prevalence in the Seibersdorf G. pallidipes Tororo colonies by fly dissection. Flies (n = 360) of different ages were randomly selected from the different colonies at two time points after implementation of the clean feeding system and dissected to determine the status of the salivary glands. Numbers between brackets are the mean percentage SGH prevalence. Vala: valacyclovir, CF: clean feeding. There is no significant difference between any of the treatments except the initial prevalence.