Factors involved in the development of conjunctivitis are '''dust and flies''', causing high incidence during the summer months. Stabled environments high in dust, dirt and allergens cause conjunctivitis during the winter. The problem can, therefore, be seen all year round. | Factors involved in the development of conjunctivitis are '''dust and flies''', causing high incidence during the summer months. Stabled environments high in dust, dirt and allergens cause conjunctivitis during the winter. The problem can, therefore, be seen all year round. |