3517 x 4859 px | 29,8 x 41,1 cm | 11,7 x 16,2 inches | 300dpi
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Dorsal view of an adult female western blacklegged tick, Ixodes pacificuswhich has which transmits the zoonotic infection human granulocytic ehrlichiosis (HGE), in the western United States. The small scutum, or tough, chitinous dorsal abdominal plate, does not cover its entire abdomen, thereby, allowing the abdomen to expand many times when this tick ingests its blood meal, and which identified this specimen as a female. The four pairs of jointed legs, places these ticks in the Phylum Arthropoda, and the Class Arachnida. HGE represents the second recognized ehrlichial infection of humans in the United States, and was first described in 1994. The name for the species that causes HGE has not been formally proposed, but this species is closely related, or identical to the veterinary pathogens Ehrlichia equi, and Ehrlichia phagocytophilia. HGE is transmitted by the blacklegged tick, Ixodes scapularis, and the western blacklegged tick, Ixodes pacificus, in the United States. Patients with ehrlichiosis generally visit a physician in their first week of illness, following an incubation period of about 5-10 days after the tick bite. Initial symptoms generally include fever, headache, malaise, and muscle aches. Other signs and symptoms may include nausea, vomiting, diarrhea, cough, joint pains, confusion, and occasionally rash
