 Blue eye disease is caused by the porcine rubulavirus, which first emerged in 1980 throughout parts of Mexico, including La Piedad, Michoacan, Jalisco, and Guanajuato.The virus is transmitted directly and indirectly by fomites and birds and can be found throughout the body, including neurons and most soft tissues.Blue eye disease outbreaks can happen throughout the year but are most common during spring and summer months of April to July.