Broad, Multi-Year Sampling Effort Highlights Complex Dynamics of the Tick-Borne Pathogen<i>Ehrlichia chaffeensis</i>(Rickettsiales: Anaplasmatacae)

Simpson, Dylan; Teague, Molly; Weeks, Joanna K.; Lewis, Andrew D; D'Addio, Phillip M; Moore, Julia D; Thompson, Joseph A.; Harris, April L.; Cannella, Richard T; Kaup, Brent Z.; Kerscher, Oliver; Leu, Matthias

doi:10.1093/jme/tjy171

Cited by 5 publications

(2 citation statements)

References 51 publications

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“…Ehrlichia hydrochoerus" in A. dubitatum . Abiotic factors not only have direct effects on tick fitness but may also modulate pathogen development and growth in ticks 43 – 45 . Parasites are not harmless to their hosts, and this holds true for tick-borne rickettsial pathogens as well, which can cause a decrease in both tick survival 46 and moulting success 47 .…”

Section: Discussionmentioning

confidence: 99%

Capybara density and climatic factors as modulators of Ehrlichia prevalence in questing ticks in the Iberá wetlands, Argentina

Eberhardt

Manzoli

Fernández

et al. 2023

Sci Rep

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We evaluated the presence of Ehrlichia spp. in unfed capybara ticks, Amblyomma dubitatum, and explored its association with capybaras density, ticks density and environmental variables. We observed that in the Iberá wetlands ecoregion A. dubitatum is infected by "Candidatus Ehrlichia hydrochoerus” and in a lesser extent with an Ehrlichia species closely related to Ehrlichia chaffeensis. The frequency of "Ca. Ehrlichia hydrochoerus" presence in A. dubitatum was not associated with vector abundance, but the probability of finding "Ca. Ehrlichia hydrochoerus"-infected ticks increased when the density of capybaras was low two months before. We hypothesize that when the density of capybaras decreases, A. dubitatum immature stages may seek out alternative hosts one of which could exhibit high realized reservoir competence for "Ca. Ehrlichia hydrochoerus", leading to an increased prevalence of this ehrlichiae in questing A. dubitatum. High minimum temperatures and high cumulative rainfall in the time period previous to tick collection (15 to 60 days) were positively correlated with the prevalence of "Ca. Ehrlichia hydrochoerus" infection in A. dubitatum. Our results suggest that a combination of factors (both biological and abiotic) could raise the risk of human exposure to tick-borne Ehrlichia in the Iberá wetlands ecoregion.

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Section: Discussionmentioning

confidence: 99%

Capybara density and climatic factors as modulators of Ehrlichia prevalence in questing ticks in the Iberá wetlands, Argentina

Eberhardt

Manzoli

Fernández

et al. 2023

Sci Rep

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“…Whilst ehrlichiosis caused by E. chaffeensis is considered to be underreported and probably as prevalent as Rocky Mountain spotted fever (see below), less than 20 cases of E. ewingii have been documented, and are mostly reported in immunosuppressed patients [52,231]. The prevalence of E. chaffeensis in ticks is higher (0.6-19%) [217,[220][221][222][232][233][234][235][236][237][238][239] than E. ewingii (0.24-7.1%) [217,[220][221][222][233][234][235][236]238]. It is thought that E. chaffeensis and E. ewingii are maintained in cycles involving a wide variety of competent vertebrate reservoir hosts, such as white-tailed deer, and A. americanum as the primary vector [52,235,240].…”

Section: Europe: Hyalomma Lusitanicum In Spainmentioning

confidence: 99%

The Unexpected Holiday Souvenir: The Public Health Risk to UK Travellers from Ticks Acquired Overseas

Gillingham

Cull

Pietzsch

et al. 2020

IJERPH

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Overseas travel to regions where ticks are found can increase travellers’ exposure to ticks and pathogens that may be unfamiliar to medical professionals in their home countries. Previous studies have detailed non-native tick species removed from recently returned travellers, occasionally leading to travel-associated human cases of exotic tick-borne disease. There are 20 species of tick endemic to the UK, yet UK travellers can be exposed to many other non-native species whilst overseas. Here, we report ticks received by Public Health England’s Tick Surveillance Scheme from humans with recent travel history between January 2006 and December 2018. Altogether, 16 tick species were received from people who had recently travelled overseas. Confirmed imports (acquired outside of the UK) were received from people who recently travelled to 22 countries. Possible imports (acquired abroad or within the UK) were received from people who had recently travelled to eight European countries. Species-specific literature reviews highlighted nine of the sixteen tick species are known to vector at least one tick-borne pathogen to humans in the country of acquisition, suggesting travellers exposed to ticks may be at risk of being bitten by a species that is a known vector, with implications for novel tick-borne disease transmission to travellers.

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Habitat amount, quality, and fragmentation associated with prevalence of the tick-borne pathogen Ehrlichia chaffeensis and occupancy dynamics of its vector, Amblyomma americanum

et al. 2019

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Broad, Multi-Year Sampling Effort Highlights Complex Dynamics of the Tick-Borne PathogenEhrlichia chaffeensis(Rickettsiales: Anaplasmatacae)

Cited by 5 publications

References 51 publications

Capybara density and climatic factors as modulators of Ehrlichia prevalence in questing ticks in the Iberá wetlands, Argentina

Capybara density and climatic factors as modulators of Ehrlichia prevalence in questing ticks in the Iberá wetlands, Argentina

The Unexpected Holiday Souvenir: The Public Health Risk to UK Travellers from Ticks Acquired Overseas

Habitat amount, quality, and fragmentation associated with prevalence of the tick-borne pathogen Ehrlichia chaffeensis and occupancy dynamics of its vector, Amblyomma americanum

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