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Predicting the Emergence of Tick-Borne Infections Based on Climatic Changes in Korea

嗜噬粒细胞间质 无浆体病 兽医学 埃里希体 埃立克体病 生物 滴答声 无浆体 蜱传疾病 蜱传脑炎 生态学 病毒学 免疫学 病毒 医学 埃立克体 脑炎 伯氏疏螺旋体 抗体
作者
Joon-Seok Chae,Jennifer Adjemian,Heung-Chul Kim,Sungjin Ko,Terry A. Klein,Janet E. Foley
出处
期刊:Vector-borne and Zoonotic Diseases [Mary Ann Liebert, Inc.]
卷期号:8 (2): 265-276 被引量:19
标识
DOI:10.1089/vbz.2007.0190
摘要

Granulocytic anaplasmosis (GA) and monocytic ehrlichiosis (ME) are maintained in wild rodent reservoirs and tick vectors in the Republic of Korea. This study investigated the prevalence of 2 tick-borne pathogens, Anaplasma phagocytophilum and Ehrlichia chaffeensis, in wild rodents and ticks in central Korea to identify any significant associations with existing or changing climatic conditions. Specifically, the goal of this study was to develop simple models for the probability of occurrence of an epidemic of GA or ME as a function of climate in an area in a given year. Climatic data from 2 regions, Munsan and Dongducheon, Gyeonggi, in central Korea (between the Demilitarized Zone and Seoul, latitude between 37 degrees N-38 degrees N and longitude between 127 degrees E-128 degrees E), were analyzed with respect to the prevalence of GA and ME in Paju, Yoncheon, Pocheon, and Dongducheon for the period from 2001 to 2005. Rates of A. phagocytophilum and E. chaffeensis decreased as the total yearly precipitation levels and daily humidity increased, and as the daily mean sunshine hours decreased. Rates of A. phagocytophilum and E. chaffeensis from rodent ticks and rodents increased in the fall season. Linear regression analyses evaluating the numbers of positive samples by sample type found that rodent ticks were 6.64 times more likely to be actively infected with A. phagocytophilum than grass ticks or rodents, though the likelihood of any samples testing positive for this pathogen decreased by 0.17 as the annual mean level of precipitation increased by 1 mm. For E. chaffeensis, rodents were 15.67 times more likely to be infected than ticks. Logistic regression analyses evaluating each sample separately found that the odds of infection with A. phagocytophilum were nearly 5 times greater for rodents than ticks. In these analyses, precipitation was one potential factor to account for the prevalence of tickborne diseases.
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