PATHOGENS 14/11/21 Molecular Evidence for Flea-Borne Rickettsiosis in Febrile Patients from Madagascar. FRONT. VET. SCI. 07/06/21 Molecular Detection and Characterization of Rickettsia Species in Ixodid Ticks Collected From Cattle in Southern Zambia. Introduction Vector–borne zoonotic pathogens are of increasing importance worldwide, with many reports of emerging and/or re-emerging pathogens being detected in invertebrate hosts (1).
This increase in reports has been attributed to factors such as climate change, land-use changes as well as various anthropogenic activities (2). FRONT. VET. SCI. 26/05/21 Zoonotic Rickettsia Species in Small Ruminant Ticks From Tunisia. Introduction Rickettsia species (family Rickettsiaceae; order Rickettsiales) are included into four groups: the spotted fever group (SFG) rickettsiae, the typhus group, the Rickettsia bellii group, and the Rickettsia canadensis group (1).
These pathogens infected several domesticated and wild vertebrate hosts through hematophagous arthropod vectors bites (mainly ticks, fleas, and mites). Besides, tick-borne rickettsioses are considered as one of the most virulent zoonotic diseases affecting humans especially in African countries (2). Spotted fever group rickettsioses (SFG) are actually considered as emerging and reemerging diseases affecting animals worldwide. They are caused by the pathogenic and zoonotic spotted fever Rickettsia bacteria mainly transmitted by ticks. Ticks and Tick-Borne Diseases, 2020, 11 (3), Two novel Rickettsia species of soft ticks in North Africa: ‘Candidatus Rickettsia africaseptentrionalis’ and ‘Candidatus Rickettsia mauretanica’ Interdisciplinary Perspectives on Infectious Diseases 24/08/20 Serological Evidence of Rickettsia Exposure among Patients with Unknown Fever Origin in Angola, 2016-2017.
Spotted fever group Rickettsia (SFGR) is one among the aetiologies that cause fever of unknown origin in Angola.
Despite their occurrence, there is little information about its magnitude in this country either because it is misdiagnosed or due to the lack of diagnostic resources. For this purpose, eighty-seven selected malaria- and yellow fever-negative serum specimens collected between February 2016 and March 2017 as part of the National Laboratory of Febrile Syndromes, from patients with fever (≥37.5°C) for at least 4 days and of unknown origin, were screened for Rickettsia antibodies through an immunofluorescence assay (IFA). Serological results were interpreted according to the 2017 guidelines for the detection of Rickettsia spp. Three seroreactive patients had detectable IgM antibodies to Rickettsia with an endpoint titre of 32 and IgG antibodies with endpoint titres of 128 and 256. 1. 2. 2.1.
Am J Trop Med Hyg. 2018 Jul;99(1): Diagnosis of Spotted Fever Group Rickettsioses in U.S. Travelers Returning from Africa, 2007-2016. New Microbes and New Infections Volume 27, January 2019, Seasonal distribution of Rickettsia spp. in ticks in northeast Algeria. MEDICAL AND VETERINARY ENTOMOLOGY 03/11/18 Fleas from domestic dogs and rodents in Rwanda carry Rickettsia asembonensis and Bartonella tribocorum. Introduction Fleas (Siphonaptera) transmit vector‐borne disease pathogens worldwide (Walker et al., 1996; Eisen & Gage, 2012).
Among mammalian hosts harbouring fleas, rodents play a dominant role as a result of their close associations with humans, especially in populous rural areas (Gundi et al., 2012). With the exception of Yersinia pestis (Enterobacteriales: Enterobacteriaceae), the cause of plague, flea‐borne pathogens, such as Bartonella spp. and Rickettsia spp., remain neglected in sub‐Saharan Africa (Kumsa et al., 2014; Leulmi et al., 2014). Plague is now absent from several sub‐Saharan countries such as Rwanda; nevertheless, knowledge of the distribution of potential flea vectors of Y. pestis is relevant because of its potential re‐emergence from endemic regions such as the Democratic Republic of Congo (Stenseth et al., 2008; Amatre et al., 2009).
Materials and methods Flea specimens Morphological identification of fleas Extraction of genomic DNA Results Discussion Acknowledgements. PLOS 27/11/17 Seroprevalence of rickettsial infections and Q fever in Bhutan. Abstract Background With few studies conducted to date, very little is known about the epidemiology of rickettsioses in Bhutan.
Due to two previous outbreaks and increasing clinical cases, scrub typhus is better recognized than other rickettsial infections and Q fever. Methodology A descriptive cross-sectional serosurvey was conducted from January to March 2015 in eight districts of Bhutan. Results Of the 864 participants, 345 (39.9%) were males and the mean age of participants was 41.1 (range 13–98) years. Conclusion.
PLOS 21/03/16 Diversity of Bartonella and Rickettsia spp. in Bats and Their Blood-Feeding Ectoparasites from South Africa and Swaziland. Abstract In addition to several emerging viruses, bats have been reported to host multiple bacteria but their zoonotic threats remain poorly understood, especially in Africa where the diversity of bats is important.
Here, we investigated the presence and diversity of Bartonella and Rickettsia spp. in bats and their ectoparasites (Diptera and Siphonaptera) collected across South Africa and Swaziland. We collected 384 blood samples and 14 ectoparasites across 29 different bat species and found positive samples in four insectivorous and two frugivorous bat species, as well as their Nycteribiidae flies. Phylogenetic analyses revealed diverse Bartonella genotypes and one main group of Rickettsia, distinct from those previously reported in bats and their ectoparasites, and for some closely related to human pathogens.
Our results suggest a differential pattern of host specificity depending on bat species. Parasites & Vectors 31/05/17 Serological and molecular detection of spotted fever group Rickettsia in a group of pet dogs from Luanda, Angola. To the best of our knowledge, this study shows for the first time the presence of SFGR in dogs in Luanda.
A considerably lower prevalence of IgG antibodies against Rickettsia spp. was found in dogs when compared with other studies that assessed serum samples from dogs  or people . On the other hand, the molecular prevalence in the present study was also lower than in another study that assessed Rickettsia spp. in dogs from Nigeria . Nevertheless, the low prevalence could be related to the fact that tick species that were infesting this group of dogs had a low prevalence of rickettsial infection. CDC - OCT 2013 - Rickettsia africae in Amblyomma variegatum Ticks, Uganda and Nigeria.
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Centre national de référence des Rickettsia, Coxiella et Bartonella - IHU Méditerranée Infection.
AP-HM/AMU. Des scientifiques marseillais ont découvert que le moustique vecteur du paludisme pouvait transmettre la bactérie Rickettsia felis, responsable en Afrique de fièvres d’origine inconnue. – guatemalt
Ticks Tick Borne Dis. 2016 Feb 8. Molecular Diagnosis of Rickettsia Infection in Patients from Tunisia. Q Fever, Scrub Typhus, and Rickettsial Diseases in Children, Kenya, 2011–2012 - Volume 22, Number 5—May 2016. Author affiliations: Naval Medical Research Center, Silver Spring, Maryland, USA (A.N.
Maina, C.M. CDC EID - Volume 21, Number 4—April 2015 High Seroprevalence of Antibodies against Spotted Fever and Scrub Typhus Bacteria in Patients with Febrile Illness, Kenya. Author affiliations: Walter Reed Project/Kenya Medical Research Institute, Kisumu, Kenya (J.W.
Thiga, B.K. Mutai, W.K. PARASITES AND VECTORS 31/12/13 Multispacer typing of Rickettsia isolates from humans and ticks in Tunisia revealing new genotypes. CDC EID - NOV 2013 - Common Epidemiology of Rickettsia felis Infection and Malaria, Africa. Oleg Mediannikov1, Cristina Socolovschi1, Sophie Edouard, Florence Fenollar, Nadjet Mouffok, Hubert Bassene, Georges Diatta, Adama Tall, Hamidou Niangaly, Ogobara Doumbo, Jean Bernard Lekana-Douki, Abir Znazen, M’hammed Sarih, Pavel Ratmanov, Herve Richet, Mamadou O. Ndiath, Cheikh Sokhna, Philippe Parola, and Didier Raoult ( Author affiliations: 1These authors contributed equally to this article.; Aix Marseille Université, Marseille, Faculté de Médecine, Marseille, France (O. Mediannikov, C. Socolovschi, S. Suggested citation for this article Abstract. PARASITES & VECTORS 22/09/14 First molecular detection of Rickettsia africae in ticks from the Union of the Comoros.
CDC EID - Volume 20, Number 10—October 2014. Au sommaire notamment: Borrelia garinii and Rickettsia monacensis in Ixodes ricinus Ticks, Algeria. Suggested citation for this article To the Editor: Lyme disease (Lyme borreliosis) is caused by a group of related spirochetes (Borrelia burgdorferi sensu lato) that include ≥11 species (1). In northern Africa, the main vector of Lyme disease in Europe (Ixodes ricinus ticks) is also present, and this disease has been suspected to be present in this region of Africa (2).
Twenty-one cases of Lyme disease were reported in Algiers, Algeria, during 1996–1999 (3). However, these cases were diagnosed by detection of only serum antibodies against B. burgdorferi by ELISA without confirmation by Western blotting. CDC EID - Volume 21, Number 2—February 2015 Novel Candidatus Rickettsia Species Detected in Nostril Tick from Human, Gabon, 2014. Author affiliations: University Hospital Ramón y Cajal, Madrid, Spain (R. Lopez-Velez, F.F. Norman, J.A. Pérez-Molina); Hospital San Pedro–Center of Biomedical Research of La Rioja, Logroño, Spain (A.M. Palomar, J.A.
Oteo, A. Suggested citation for this article Abstract We report the identification of a nymphal nostril tick (Amblyomma sp.) from a national park visitor in Gabon and subsequent molecular detection and characterization of tickborne bacteria. Ticks are hematophagous arthropods that parasitize different species of vertebrates, and they serve as intermediate hosts for infectious pathogens that can have serious implications for humans. A 21-year-old female field worker from Spain visited Lopé National Park in Gabon (Africa) for 13 days during January–February 2014 to observe chimpanzees and gorillas.
Immature stages of Amblyomma ticks cannot be identified to the species level on the basis of morphologic features without allowing the nymph to molt. CDC EID - MARS 2010 – Rickettsia africae, Westen Africa. CDC EID - JANV 2011 - Emergence of Rickettsia africae, Oceania. Author affiliations: Author affiliations: Université de la Méditerranée, Marseille, France (C. Eldin, O. Mediannikov, B. Davoust, D. Raoult, P. Parola); French Army Health Service, Marseille (B. CDC EID JUILLET 2008 Spotted Fever Group Rickettsiae in Ticks, Morocco. CDC EID - OCT 2012 - Rickettsia felis in Aedes albopictus Mosquitoes, Libreville, Gabon. Skip directly to local search Skip directly to A to Z list Skip directly to navigation Skip directly to site content Skip directly to page options CDC Home CDC 24/7: Saving Lives.