These maps show the change in the distribution of mycoplasmal conjunctivitis in House Finches from November 1994 through March 1997. The November and March maps represent the beginning and end of winter.
Orange indicates low prevalence of the disease, and red indicates high prevalence.
Dark gray indicates the presence of House Finches without the disease. White indicates insufficient data because of an insufficient number of either observers or birds. The blue crosses indicate reports of the disease isolated by at least 200 km from other reports of the disease. Details of this study were reported in the April 1997 issue of Journal of Wildlife Diseases. The House Finch Disease Survey monitors the occurrence and spread of conjunctivitis in House Finches and other bird species.