 Young calves and cows at peak lactation show more severe clinical symptoms, but all age-groups are susceptible to the disease.Outbreaks of LSDV are associated with high temperature and high humidity It is usually more prevalent during the wet summer and autumn months, especially in low-lying areas or near bodies of water, however, outbreaks can also occur during the dry season.Blood-feeding insects such as mosquitos and flies act as mechanical vectors to spread the disease.