The primary risk factors associated with<unk>  are exposure to an endemic environment and the season of exposure. Lone Star ticks have been identified as the primary vector of E. ewingii and E. chaffeensis infections, thus being bitten in an endemic area may result in the contraction of the disease. (The primary vector of E. muris has not yet been verified.)
Ehrlichiosis risk factors
Histoplasmosis risk factors
Typhoid fever risk factors
Conjunctivitis risk factors
Paratyphoid fever risk factors
Anthrax risk factors
Anaphylaxis risk factors
Byssinosis risk factors