We did not find any significant difference in the prevalence of avian pox-like lesions in house sparrows by sex, habitat type or month during the study period. APV disease frequency has been correlated to wet seasons and rain patterns. Higher frequency has been described during winter , autumn in temperate climates  or in years with high precipitation . Our results suggest that factors favouring virus transmission did not evidence temporal variation within the study period (2013–2014) in the study area. However, birds were captured during few months overlapping with the highest abundance of mosquitoes , potentially favouring virus transmission. In addition, factors including the cyclical boom in immune naïve hatch-year birds may also play a role in the observed prevalences. In fact, higher pox prevalences are more frequently reported in juveniles than in adults [2,4,16,40,41, this study]. This fact could be due to the naïve immunological status of juvenile birds or the existence of frequent asymptomatic infections in adults. Additionally, a higher mortality rate of infected juvenile birds may result in a differential prevalence between adults and juveniles.