Clinical and epidemiological aspects of Astrakhan rickettsial spotted fever

  Published: 18.11.08 Updated: 19.11.2008 11:26:03
Ugoleva SV, Burkin AV, Shabalina SV, et al. Clinical and epidemiological aspects of Astrakhan rickettsial spotted fever. Infektsionnye bolezni (Infectious diseases) 2008; 1: 35-40.

Ugoleva S. V. et al studied the incidence of Astrakhan rickettsial spotted fever (ARSF) in all districts of Astrakhan oblast in 2001-2006. The study aimed to describe epidemiological and clinical features of ARSF. The authors also studied the prevalence of ticks in domestic animals in towns and villages of Astrakhan oblast. Altogether, 2342 animals were studied from 2001 through 2006.

Altogether, 1162 cases of ARSF were registered in Astrakhan oblast during the study period. The incidence of ARSF in Astrakhan oblast increased from 13 per 100000 in 2001 to 22 per 100000 in 2006. ARSF cases were registered in 9 of 11 districts of Astrakhan oblast. The incidence of ARSF among urban residents was 1.75 times lower than the incidence among rural residents. The incidence of ARSF greatly varied between the districts with the highest level of 56 per 100000 in Krasnoyarskiy district during the study period.  Men constituted 73.8% of all ARSF cases. The incidence of ARSF peaked in September. Most often, the cases were infected in their gardens and yards.

Out of 4536 ticks found on domestic animals, 99% were collected from dogs and 1% from cats.

The incubation period for ARSF was on average 7±2 days. The authors report that the clinical course of ARSF in most of the cases was either slightly moderate or moderate severe. The average duration of in-hospital stay was 7±1 days. The febrile period lasted for 8±3 days on average. For the last 20 years, there were no lethal cases of ARSF in Astrakhan oblast.