Relapsing fever tick (FEBRIS RECURRENS ACARINA) etiology. The disease is a special kind of spirochetes – Spirochaeta sogdianum, length and number of coils in some instances are very volatile. On average they have 6-8 coils, coil ranges from 12 to 20 in the length of the filament with a thickness of 0.3 to 0.5 fi. For the detection of spirochetes in blood smear or enjoy the large drops of blood stained magenta. Epidemiology.
Reservoir of infection are hamsters, shrews and rodents that live in desert areas of Central Asia and in some foreign countries in Asia (Iran, Iraq, Afghanistan). The only carrier of infection is kind of ticks Ornithodorus papillipes. Tick-borne relapsing fever refers to the Among infectious diseases with natural foci due to the fact that the reservoirs and vectors of the pathogen – mites live only in certain circumstances. The latter include the walls of adobe buildings, the grooves between the stones Fence pliers, etc. for a long time remain a spirochete, transfer them transovarian. A person infected by the bite of infected ticks, infection occurs usually at night, so the need to protect rights in sleep from tick bites. Biting man, mite produces coxal fluid containing spirochetes, it flows into the wound from the bite, and the spirochetes are in the blood stream. In the former USSR tick borne relapsing fever occurs in some areas of Uzbekistan, Kyrgyzstan, Tajikistan and Turkmenistan.
Clinic. The incubation period lasts an average of 6-20 days with a range from 4 to 15 days. On the site of a tick bite on the skin formed papule dark cherry color. The disease begins acutely and after chill the temperature rises to 38,5-39,5 , comes the first attack of weakness, fatigue throughout the body, a slight enlargement of the spleen, with no increase in liver yellowness of skin, mild soreness in the calf muscles – this is the first episode of the clinical picture of tick-borne relapsing fever.