OBJECTIVES Earthquakes are one the most common natural disasters that lead to increased mortality and morbidity from transmissible diseases, partially because the rodents displaced by an earthquake can lead to an increased rate of disease transmission. The aim of this study was to evaluate the prevalence of plague and tularemia in rodents in the earthquake zones in southeastern Iran.
METHODS
In April 2013, a research team was dispatched to explore the possible presence of diseases in rodents displaced by a recent earthquake magnitude 7.7 around the cities of Khash and Saravan in Sistan and Baluchestan Province. Rodents were trapped near and in the earthquake zone, in a location where an outbreak of tularemia was reported in 2007. Rodent serums were tested for a serological survey using an enzyme-linked immunosorbent assay.
RESULTS
In the 13 areas that were studied, nine rodents were caught over a total of 200 trap-days. Fortyeight fleas and 10 ticks were obtained from the rodents. The ticks were from the Hyalomma genus and the fleas were from the Xenopsylla genus. All the trapped rodents were Tatera indica. Serological results were negative for plague, but the serum agglutination test was positive for tularemia in one of the rodents. Tatera indica has never been previously documented to be involved in the transmission of tularemia.
CONCLUSIONS
No evidence of the plague cycle was found in the rodents of the area, but evidence was found of tularemia infection in rodents, as demonstrated by a positive serological test for tularemia in one rodent.
Summary
Citations
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OBJECTIVES Tularemia is a zoonotic disease transmitted by direct contact with infected animals and through arthropod bites, inhalation of contaminated aerosols, ingestion of contaminated meat or water, and skin contact with any infected material. It is widespread throughout the northern hemisphere, including Iran and its neighbors to the north, northeast, and northwest.
METHODS
In this paper, the epidemiology of tularemia as a re-emerging infectious disease in the world with a focus on Iran and the neighboring countries is reviewed.
RESULTS
In Iran, positive serological tests were first reported in 1973, in wildlife and domestic livestock in the northwestern and southeastern parts of the country. The first human case was reported in 1980 in the southwest of Iran, and recent studies conducted among at-risk populations in the western, southeastern, and southwestern parts of Iran revealed seroprevalences of 14.4, 6.52, and 6%, respectively.
CONCLUSIONS
Several factors may explain the absence of reported tularemia cases in Iran since 1980. Tularemia may be underdiagnosed in Iran because Francisella tularensis subspecies holarctica is likely to be the major etiological agent and usually causes mild to moderately severe disease. Furthermore, tularemia is not a disease extensively studied in the medical educational system in Iran, and empirical therapy may be effective in many cases. Finally, it should be noted that laboratories capable of diagnosing tularemia have only been established in the last few years. Since both recent and older studies have consistently found tularemia antibodies in humans and animals, the surveillance of this disease should receive more attention. In particular, it would be worthwhile for clinical researchers to confirm tularemia cases more often by isolating F. tularensis from infected humans and animals.
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Tularemia is a zoonosis caused by Francisella tularensis. It is primarily a disease of wild animals. Human infection is incidental and usually results from interaction with biting or blood-sucking insect, wild or domestic animals or the environment. It is common in United States. An increasing number of cases have been reported from the Scandinavian countries, eastern Europe, Siberia, and Japan. But In Korea it has not been reported. A 40-year old male visited the department of Surgery on Jan 13, 1997 complaining multiple swollen lymph-nodes on his axillae and upper right arm for about ten days. On Dec 25, 1996, he found a dead wild rabbit at mountainside nearby, cooked it himself and ate it with his friends. He informed us that he got light injury on both hands while he was walking on the mountainside. On Dec 28, he started to suffer from high fever, fatigue and loss of appetite lasting for a day. After medication at a local clinic for several day, symptoms were somewhat relieved. A week later(Jan 4, 1997), several erythematous lesions developed on his both hands, which left ulcerations on the skin. Both axillary lymph nodes were swollen at both sides, but not tender. He visited the department of surgery on Jan 13 and he admitted on Jan 15. During hospitalization, the lymph nodes were surgically removed from both axillae and upper left arm. On microbiologic examination, small aerobic gram negative coccobacilli were grown on the chocolate agar plate in aerobic condition with 5% CO2 at 37 degrees centigrade. On Feb 10, fine needle aspiration from the liver abscess was done, drawing 3 ml of yellowish thick pustular material, but the microorganism was not isolated at the smear and culture of this material in the same condition as described above. After admission, he was treated with antibiotics(cefazole and marocin). His general conditions and laboratory results, including liver function, were markedly improved. He was discharged on Feb 12 and appears well on subsequent follow-ups. The microorganism and lymph nodes were sent to Centers for Disease Control and Prevention in the United States for further evaluation. A twostep indirect immunoalkaline phosphatase technique using an anti-F. tularensis antibody was performed on the lyph nodes having a positive reaction. The immunohistochemical stain demonstrated intense positivity in the stellate abscesses and fine granular reaction in some of the vessels in the paracortical region. Also F. tularensis was identified in the agar plug by culture morphology and immunofluorescence antibody test. We report a case of F.
tularensis in Korea for the first time. Further studies were recommened for epidemiological characteristics and prevention of the disease.