Based on the 2004 St. Louis Metro Area Acton Plan
The first reports of West Nile virus in the Western Hemisphere occurred in New York City in 1999. Human, bird, horse and small mammal cases were subsequently reported throughout the Middle Atlantic States and New England. Since that time, the virus has spread south to Florida and west through Missouri, infecting birds and mosquitoes in a natural cycle.
West Nile virus was discovered in St. Louis and St. Louis County through bird testing during late September and early October of 2001. It continues to recur within the state and Jefferson County. Each year human West Nile infections are identified and the virus continues to be identified in birds and mosquitoes. If the CDC estimate of approximately 141 asymptomatic infections for every clinical case is correct, we have thousands of exposed asymptomatic individuals within Missouri each year.
St. Louis Encephalitis has been identified in several areas in the state including in mosquitoes within Jefferson County. Other mosquito borne illnesses are endemic in Missouri such as Lacrosse encephalitis, Eastern Equine Encephalitis and Western Equine Encephalitis while yet other mosquito borne illnesses such as malaria (Eliminated from the U.S. in the 1950’s) and new diseases such as Dengue Fever are reemerging or are impending threats in the U.S. .These mosquito borne pathogens may be a public health risk at any time and require the surveillance and control efforts outlined in the Mosquito Borne Disease Response Plan. This plan outlines our response activities and surveillance activities as tools to reduce or prevent human infections.
This plan was originally completed through the combined efforts of Mark Ritter (City of St. Louis), Ron Darling (St. Peters, Missouri), Barry McCauley (St. Charles County) and Joan Bradford and Michael Williams (St. Louis County). It was reviewed and revised in March of 2003 to reflect the results of the 2002 West Nile introduction into the area. Guidelines and written materials from the City of New York, the Federal Centers for Disease Control and Prevention (CDC) and the Missouri Department of Health and Senior Services were used in the preparation of this document.
The plan was again revised in 2007 by the Jefferson County Health Department.