Reservoir
We have identified the disease reservoir to be an Eastern Grey Squirrel, Sciurus carolinensis, based on reported animal deaths in the areas of concern. The general markings of an Eastern Grey Squirrel show a grayish-brown fur and a white belly. This type of squirrel is most commonly found in the states east (with some sightings slightly west) of the Mississippi River ranging from as south as Florida to as North as Canada in mainly wooded environments. Generally, the squirrels, especially in the south, will be found all year round. The only exception is if temperatures reach too low. They dwell in cavities of trees or stay close to the nests built high in the trees. The mating season of the squirrel takes place at two times: spring and late summer. The diet of this squirrel consists of various types of nuts, seeds, fruits, insects, and even an occasional baby bird or bird egg. The most common predators of the Eastern Grey Squirrel include red foxes, raccoons, multiple types of snakes, and various birds such as hawks and owls. Contact with humans can most commonly be seen in the nesting of the squirrels in attics of homes and the destruction of gardens.
The figure shows the general distribution of the Eastern Grey Squirrel across the United States. It extends north all the way up the east coast into southern parts of Canada and goes west slightly past the Mississippi River into Texas, Oklahoma, Kansas, Nebraska, and North Dakota.