Six (see note below) species have been shown to cause human infection: * Anaplasma phagocytophilum causes human granulocytic anaplasmosis. A. phagocytophilum is endemic to New England and the north-central and Pacific regions of the United States. * Ehrlichia ewingii causes human ewingii<unk> . E. ewingii primarily infects deer and dogs (see<unk>  (canine)). E. ewingii is most common in the south-central and southeastern states. * Ehrlichia chaffeensis causes human monocytic<unk> . E. chaffeensis is most common in the south-central and southeastern states. * Ehrlichia canis * Neorickettsia sennetsu *Ehrlichia muris eauclairensis Ixodes scapularis is another type of tick that can spread<unk>  muris eauclairensis. The latter three infections are not well studied. Ehrlichia muris eauclairensis was recently discovered and has low reporting numbers due to the fact that it is relatively new and because its symptoms are very similar to the symptoms caused by other Ehrlichia bacteria. In 2008, human infection by a Panola Mountain (in Georgia, USA) Ehrlichia species was reported. On August 3, 2011, infection by a yet-unnamed bacterium in the genus Ehrlichia was reported, carried by deer ticks and causing flu-like symptoms in at least 25 people in Minnesota and Wisconsin. Until then, human<unk>  was thought to be very rare or absent in both states. The new species, which is genetically very similar to an Ehrlichia species found in Eastern Europe and Japan called E. muris, was identified at a Mayo Clinic Health System hospital in Eau Claire. Ehrlichia species are transported between cells through the host-cell filopodia during the initial stages of infection; whereas, in the final stages of infection, the pathogen ruptures the host cell membrane.
Ehrlichiosis
Toxoplasmosis
Malaria
Anthrax
Freshers' flu
Bird Flu
Spanish flu
Rickettsiosis