期刊
VECTOR-BORNE AND ZOONOTIC DISEASES
卷 14, 期 10, 页码 693-702出版社
MARY ANN LIEBERT, INC
DOI: 10.1089/vbz.2014.1578
关键词
Rickettsia africae; Tick-borne spotted fever group; African tick-bite fever.; Ambylomma variegatum
资金
- Wellcome Trust, UK [081828/B/06/Z]
- MRC [G0902417] Funding Source: UKRI
- Medical Research Council [G0902417] Funding Source: researchfish
Tick-borne spotted fever group (SFG) rickettsioses are emerging human diseases caused by obligate intracellular Gram-negative bacteria of the genus Rickettsia. Despite being important causes of systemic febrile illnesses in travelers returning from sub-Saharan Africa, little is known about the reservoir hosts of these pathogens. We conducted surveys for rickettsiae in domestic animals and ticks in a rural setting in western Kenya. Of the 100 serum specimens tested from each species of domestic ruminant 43% of goats, 23% of sheep, and 1% of cattle had immunoglobulin G (IgG) antibodies to the SFG rickettsiae. None of these sera were positive for IgG against typhus group rickettsiae. We detected Rickettsia africae-genotype DNA in 92.6% of adult Amblyomma variegatum ticks collected from domestic ruminants, but found no evidence of the pathogen in blood specimens from cattle, goats, or sheep. Sequencing of a subset of 21 rickettsia-positive ticks revealed R. africae variants in 95.2% (20/21) of ticks tested. Our findings show a high prevalence of R. africae variants in A. variegatum ticks in western Kenya, which may represent a low disease risk for humans. This may provide a possible explanation for the lack of African tick-bite fever cases among febrile patients in Kenya.
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