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Tick-Borne Rickettsioses in International Travellers

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Tick-Borne Rickettsioses in International Travellers International Journal of Infectious Diseases (2004) 8, 139—146 REVIEW Tick-borne rickettsioses in international travellers Mogens Jensenius a,*, Pierre-Edouard Fournier b, Didier Raoult b a Department of Internal Medicine, Aker University Hospital, Oslo, Norway b Unité des Rickettsies CNRS UPRES-A 6020, Faculté de Médecine, Université de la Méditerranée, Marseille, France Received 16 May2003 ; received in revised form 24 June 2003; accepted 25 June 2003 Corresponding Editor: Richard Oberhelman, New Orleans, USA KEYWORDS Summary Background: Tick-borne rickettsioses are of emerging importance in today’s Rickettsia infections; travel medicine but have until recentlyreceived little attention. We describe the cur- Rickettsia conorii; rent knowledge of tick-borne rickettsioses as theyrelate to international travel, their Rickettsia africae; microbiological diagnosis, treatment, possible prevention, and future prospects. Methods: Literature-based review and personal observations. Travel; Results: During the last decade, some 400 cases of tick-borne rickettsioses have Diagnosis; been reported in international travellers, the vast majoritybeing African tick bite Epidemiology fever caused by Rickettsia africae and Mediterranean spotted fever caused by Rick- ettsia conorii. Onlya minorityof infected travellers can recall a preceding tick bite. Most patients present with a mild-to-moderatelysevere flu-like illness typicallyac- companied bya cutaneous rash and an inoculation eschar at the site of the tick bite, but potentiallylife-threatening disease with disseminated vaculitis is occasionally seen. Definite microbiological confirmation of tick-borne rickettsioses byisolation or antigen detection is onlyavailable at reference laboratories and diagnosis must in most cases relyon clinical and epidemiological data supported byserology.Doxycy- cline is the recommended treatment for tick-borne rickettsioses and prevention is based on personal protective measures against tick bites when travelling in endemic areas. Conclusion: Tick-borne rickettsiosis should be suspected in febrile returnees from endemic areas, especiallyin cases with skin eruptions. Travellers to endemic areas should be encouraged to use personal protective measures against tick bites. © 2004 International Societyfor Infectious Diseases. Published byElsevier Ltd. All rights reserved. Introduction site of the tick bite. The diseases are caused by spotted fever group rickettsiae; obligate intracel- Tick-borne rickettsioses are acute flu-like diseases lular Gram-negative coccobacilli, which are main- frequentlypresenting with fever, severe headache, tained in nature through complex cycles involving myalgia, skin rash, and inoculation eschars at the mammal and tick reservoirs and tick vectors, with humans onlyas incidental hosts. Most tick-borne rickettsioses are confined to certain geographi- *Corresponding author. Tel.: +47-22-89-40-00; cal areas limited bythe presence of their tick fax: +47-22-89-40-08. E-mail address: [email protected] vectors, and few are present on more than one (M. Jensenius). continent.1 1201-9712/$30.00 © 2004 International Societyfor Infectious Diseases. Published byElsevier Ltd. All rights reserved. doi:10.1016/j.ijid.2003.06.004 140 Table 1 Current classification of tick-borne rickettsioses. Human disease Organism Principal vectors Geographic distribution Reported in international travellers African tick bite fever Rickettsia africae Amblyomma ticks Sub-Saharan Africa, French West Indies Yes Mediterranean spotted fever Rickettsia conorii Rhipicephalus & Mediterranean littoral to Indian subcontinent, Yes Haemaphysalis ticks sub-Saharan Africa Indian tick typhus Indian tick typhus rickettsia Rhipicephalus ticks India Yes Astrakhan fever Astrakhan fever rickettsia Rhipicephalus ticks Caspian littoral, SE Europe, Central Africa Yes Israeli spotted fever Israeli tick typhus rickettsia Rhipicephalus ticks Eastern Mediterranean littoral, SW Europe No RockyMountain spotted fever Rickettsia rickettsii Dermacentor & North and South America Yes Amblyomma ticks Queensland tick typhus Rickettsia australis Ixodes ticks Eastern Australia Yes Unnamed Rickettsia aeschlimannii Hyalomma & Mediterranean area, Morocco, sub-Saharan Africa Yes Rhipicephalus ticks North Asian tick typhus Rickettsia sibirica Dermacentor & Former Soviet Asia, China, European Russia Yes Haemaphysalis ticks Flinder’s island spotted fever Rickettsia honei Ticks of several genera Australia, SE Asia, NW America No Japanese spotted fever Rickettsia japonica Ticks of several genera SW Japan No Unnamed ‘Rickettsia heilongjiangii’ Dermacentor ticks NE China No Unnamed Rickettsia slovaca Dermacentor ticks Southern and eastern Europe No Unnamed Rickettsia helvetica Ixodes ticks Central and northern Europe No Unnamed ‘Rickettsia mongolotimonae’ Hyalomma ticks Mongolia, France, sub-Saharan Africa No M. Jensenius et al. Tick-borne rickettsioses in international travellers 141 Tick-borne rickettsioses have traditionallybeen group, several members maybe attacked on the considered rare among international travellers and same occasion. For instance, during the investiga- until 1995 onlysome 80 cases had been reported in tion of an outbreak of African tick bite fever among the literature.2—9 In most published studies on im- Italian safari tourists to South Africa, as manyas ported fevers, the incidence rate of rickettsioses is 53 tick bites, of which 34 subsequentlydeveloped verylow and ranges from 0—2%. 10—12 However, due into inoculation eschars, were documented in five to low index of suspicion and poor availabilityof patients.18 Other important features of African tick microbiological diagnostic tests, travel-associated bite fever include prominent neck muscle myalgia, tick-borne rickettsioses could be largelyunrecog- headache, regional lymphadenitis, and, less fre- nised and under-reported. Three recent studies quently, a vesicular cutaneous rash and aphthous support this assumption. In Switzerland, it is es- stomatitis.19,20 The clinical course is frequently timated that rickettsial infection is actuallythe mild, but maybe complicated byreactive arthri- third most frequent cause of imported acute febrile tis and prolonged fever. To date, no fatal cases diseases, onlysurpassed bymalaria and enteric of documented African tick bite fever have been fever.13 In Swedish travellers to southern Africa, reported. the estimated risk of contracting rickettsioses in- African tick bite fever was virtuallyunknown creased during 1997—2001 and is now four to five outside endemic areas until some ten years ago. times higher than the risk of acquiring malaria in Since then, more than 350 travel-associated cases the same region.14 Finally, in 530 German trav- have been reported from Europe, North Amer- ellers who presented at an out-patient travel clinic ica, Australia, Argentina, and Japan.3,7,17—36 Most with fever after a trip to southern Africa, as many cases are infected in South Africa, where many as 11% had serological evidence of recent spotted popular wildlife attractions are highlyendemic fever group rickettsioses.15 for R. africae infection37 and where the aboli- Recently, the number of reported cases of tion of apartheid in the early1990s was followed travel-associated tick-borne rickettsioses has risen byan unprecedented rise in international safari significantlyworld-wide. This could be explained by tourism. African tick bite fever has been reported increased travel to endemic areas, including eco- in a wide spectrum of travellers, including leisure tourism, increased disease activity, or increased di- safari tourists, foreign aid workers, film crew mem- agnostic awareness. Of the 15 currently-recognised bers, game hunters, students, sports competitors, tick-borne rickettsioses, eight have been reported and deployed soldiers.17 In a recent prospective in international travellers: African tick bite fever, cohort studyof 940 short-term travellers to ru- Mediterranean spotted fever, Indian tick typhus, ral sub-equatorial Africa, the estimated incidence Astrakhan fever, RockyMountain spotted fever, rates of African tick bite fever ranged from 4.0— Queensland tick typhus, Rickettsia aeschlimannii 5.3%.19 These estimates are notable and widely infection and North Asian tick typhus (Table 1). This exceed those reported for other travel-associated review provides an outline of the current knowl- tropical fevers in temporaryvisitors to sub-Saharan edge of tick-borne rickettsioses as theyrelate to Africa. In the same study, game hunting, travel international travel, their microbiological diag- to southern Africa (i.e. where A. hebraeum is the nosis, treatment, possible prevention, and future principal vector of R. africae), and travel during prospects. the rainysummer season (i.e. when tick popula- tions peak in most endemic areas) were identified as independent risk factors. African tick bite fever African tick bite fever is caused by Rickettsia Mediterranean spotted fever africae and is endemic in large parts of sub-Saharan Africa and the French West Indies.16,17 The disease Mediterranean spotted fever caused by Rickettsia is transmitted byungulate ticks of the Amblyomma conorii is endemic around the Mediterranean basin, genus, principally Amblyomma hebraeum and Am- the Middle East, India, and in parts of sub-Saharan blyomma variegatum, and is typically acquired in Africa. The principal vectors are dog ticks of the rural areas where wild game or domestic cattle are Rhipicephalus and Haemaphysalis genera which present.
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