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2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Silvia Herrero-Cófreces ◽  
Manuel Fabio Flechoso ◽  
Ruth Rodríguez-Pastor ◽  
Juan José Luque-Larena ◽  
François Mougeot

Abstract Background Fleas frequently infest small mammals and play important vectoring roles in the epidemiology of (re)emerging zoonotic disease. Rodent outbreaks in intensified agro-ecosystems of North-West Spain have been recently linked to periodic zoonotic diseases spillover to local human populations. Obtaining qualitative and quantitative information about the composition and structure of the whole flea and small mammal host coexisting communities is paramount to understand disease transmission cycles and to elucidate the disease-vectoring role of flea species. The aims of this research were to: (i) characterise and quantify the flea community parasiting a small mammal guild in intensive farmlands in North-West Spain; (ii) determine and evaluate patterns of co-infection and the variables that may influence parasitological parameters. Methods We conducted a large-scale survey stratified by season and habitat of fleas parasitizing the small mammal host guild. We report on the prevalence, mean intensity, and mean abundance of flea species parasitizing Microtus arvalis, Apodemus sylvaticus, Mus spretus and Crocidura russula. We also report on aggregation patterns (variance-to-mean ratio and discrepancy index) and co-infection of hosts by different flea species (Fager index) and used generalized linear mixed models to study flea parameter variation according to season, habitat and host sex. Results Three flea species dominated the system: Ctenophthalmus apertus gilcolladoi, Leptopsylla taschenbergi and Nosopsyllus fasciatus. Results showed a high aggregation pattern of fleas in all hosts. All host species in the guild shared C. a. gilcolladoi and N. fasciatus, but L. taschenbergi mainly parasitized mice (M. spretus and A. sylvaticus). We found significant male-biased infestation patterns in mice, seasonal variations in flea abundances for all rodent hosts (M. arvalis, M. spretus and A. sylvaticus), and relatively lower infestation values for voles inhabiting alfalfas. Simultaneous co-infections occurred in a third of all hosts, and N. fasciatus was the most common flea co-infecting small mammal hosts. Conclusions The generalist N. fasciatus and C. a. gilcolladoi dominated the flea community, and a high percentage of co-infections with both species occurred within the small mammal guild. Nosopsyllus fasciatus may show higher competence of inter-specific transmission, and future research should unravel its role in the circulation of rodent-borne zoonoses.



Author(s):  
María Carolina Silva-de la Fuente ◽  
Alexandr A Stekolnikov ◽  
Thomas Weitzel ◽  
Esperanza Beltrami ◽  
Constanza Martínez-Valdebenito ◽  
...  

Abstract Three species of chigger mites are recorded in our collections from four species of cricetid rodents on Chiloé Island (southern Chile, Los Lagos Region), an area endemic to scrub typhus (Orientia sp.). Two species are described as new—Herpetacarus (Abonnencia) eloisae sp. nov. and Quadraseta chiloensis sp. nov. One species, Paratrombicula goffiStekolnikov and González-Acuña 2012, is for the first time recorded on a mammal host (one species of cricetid rodent), and its distribution is extended to the Los Lagos Region of Chile. The genus ProschoengastiaVercammen-Grandjean, 1967 is synonymized with the subgenus Herpetacarus (Abonnencia)Vercammen-Grandjean, 1960, and four new combinations are established: Herpetacarus (Abonnencia) herniosa (Brennan and Jones, 1961), comb. nov., Herpetacarus (Abonnencia) insolita (Brennan and Jones, 1961), comb. nov., Herpetacarus (Abonnencia) macrochaeta (Brennan and Jones, 1961), comb. nov., and Herpetacarus (Abonnencia) antarctica (Stekolnikov and Gonzalez-Acuña, 2015), comb. nov.



2020 ◽  
Author(s):  
Silvia Herrero-Cófreces ◽  
Manuel Fabio Flechoso ◽  
Ruth Rodríguez-Pastor ◽  
Juan José Luque-Larena ◽  
Francois Mougeot

Abstract Background: Fleas frequently infest small mammals and play important vectoring roles in the epidemiology of (re)emerging zoonotic disease. Rodent outbreaks in intensified agro-ecosystems of NW Spain have been recently linked to periodic zoonotic disease spillover to local human populations. Obtaining qualitative and quantitative information about the composition and structure of the whole flea and small mammal host coexisting communities is paramount to understand disease transmission cycles and to dilucidate the disease-vectoring role of flea species. The aims of this research were to: i) characterise and quantify the flea community parasiting a small mammal guild in intensive farmlands in NW Spain, and ii) determine and evaluate patterns of co-infection and the variables that may influence parasitological parameters.Methods: We conducted a large scale survey stratified by season and habitat of fleas parasitizing the small mammal host guild. We report on the prevalence, mean intensity, and mean abundance of flea species parasitizing Microtus arvalis, Apodemus sylvaticus, Mus spretus and Crocidura russula. We also report on aggregation patterns (variance-to-mean ratio and Discrepancy index), co-infection of hosts by different flea species (Fager Index), and used Generalized Linear Mixed Models to study flea parameter variation according to season, habitat and host sex. Results: Three flea species dominated the system: Ctenophthalmus apertus gilcolladoi, Leptopsylla taschenbergi and Nosopsyllus fasciatus. Results showed a high aggregation pattern of fleas in all hosts. All host species in the guild shared C. a. gilcolladoi and N. fasciatus, but L. taschenbergi mainly parasitized mice (M. spretus and A. sylvaticus). We found significant male-biased infestation patterns in mice, seasonal variations in flea abundances for all rodent hosts (M. arvalis, M. spretus and A. sylvaticus), and relatively lower infestation values for voles inhabiting alfalfas. Simultaneous co-infections occurred in a third of all hosts, and N. fasciatus was the commonest flea co-infecting small mammal hosts. Conclusions: The generalist N. fasciatus and C. a. gilcolladoi dominated the flea community, and a high percentage of co-infections with both species occurred within the small mammal guild. Nosopsyllus fasciatus may show higher competence of inter-specific transmission, and future research should unravel its role in the circulation of rodent-borne zoonoses.



2020 ◽  
Author(s):  
Silvia Herrero-Cófreces ◽  
Manuel Fabio Flechoso ◽  
Ruth Rodríguez-Pastor ◽  
Juan José Luque-Larena ◽  
Francois Mougeot

Abstract Background Fleas frequently infest small mammals and play important vectoring roles in the epidemiology of (re)emerging zoonotic disease. Rodent outbreaks in intensified agro-ecosystems of NW Spain have been recently linked to periodic zoonotic disease spillover to local human populations. Obtaining qualitative and quantitative information about the composition and structure of the whole flea and small mammal host coexisting communities is paramount to understand disease transmission cycles and to dilucidate the disease-vectoring role of flea species. The aims of this research were to: i) characterise and quantify the flea community parasiting a small mammal guild in intensive farmlands in NW Spain, and ii) determine and evaluate patterns of co-infection and the variables that may influence parasitological parameters. Methods We conducted a large scale survey stratified by season and habitat of fleas parasitizing the small mammal host guild. We report on the prevalence, mean intensity, and mean abundance of flea species parasitizing Microtus arvalis, Apodemus sylvaticus, Mus spretus and Crocidura russula. We also report on aggregation patterns (variance-to-mean ratio and Discrepancy index), co-infection by different flea species in hosts (Fager Index), and used Generalized Linear Mixed Models (GLMM) to study flea parameter variation according to season, habitat and host sex. Results Three flea species dominated the system (99.4%), namely: Ctenophthalmus apertus gilcolladoi, Leptopsylla taschenbergi and Nosopsyllus fasciatus. Results showed a high aggregation pattern of fleas in all hosts. All host species in the guild shared C. a. gilcolladoi and N. fasciatus, but L. taschenbergi mainly parasitized mice (M. spretus and A. sylvaticus). We found significant male-biased infestation patterns in mice, seasonal variations in flea abundances for all rodent hosts (M. arvalis, M. spretus and A. sylvaticus), and relatively lower infestation values for voles inhabiting alfalfas. Simultaneous infections by two or three flea species occurred in 36.8% of all hosts, and N. fasciatus was the commonest flea co-infecting small mammal hosts. Conclusions The generalist N. fasciatus and C. a. gilcolladoi dominated the flea community, and a high percentage of co-infections with both species occurred within the small mammal guild. Nosopsyllus fasciatus may show higher competence of inter-specific transmission, and future research should unravel its role in the circulation of rodent-borne zoonoses.



Author(s):  
Nathan Upham ◽  
Donat Agosti ◽  
Jorrit Poelen ◽  
Lyubomir Penev ◽  
Deborah Paul ◽  
...  

A deep irony of COVID-19 likely originating from a bat-borne coronavirus (Boni et al. 2020) is that the global lockdown to quell the pandemic also locked up physical access to much basic knowledge regarding bat biology. Digital access to data on the ecology, geography, and taxonomy of potential viral reservoirs, from Southeast Asian horseshoe bats and pangolins to North American deer mice, was suddenly critical for understanding the disease's emergence and spread. However, much of this information lay inside rare books and personal files rather than as open, linked, and queryable resources on the internet. Even the world's experts on mammal taxonomy and zoonotic disease could not retrieve their data from shuttered laboratories. We were caught unprepared. Why, in this digitally connected age, were such fundamental data describing life on Earth not already freely accessible online? Understanding why biodiversity science was unprepared—and how to fix it before the next pandemic—has been the focus of our COVID-19 Taskforce since April 2020 and is continuing (organized by CETAF and DiSSCo). We are a group of museum-based and academic scientists with the goal of opening the rich ecological data stored in natural history collections to the research public. This information is rooted in what may seem an unlikely location—taxonomic names and their historical usages, which are the keys for searching literature and extracting linked ecological data (Fig. 1). This has been the core motivation of our group, enabled by the pioneering efforts of Plazi (Agosti and Egloff 2009) to build tools for literature digitization, extraction, and parsing (e.g., Synospecies, Ocellus) without which biodiversity science would be even less prepared. Our group led efforts to build an additional pipeline from Plazi to the Biodiversity Literature Repository at Zenodo, a free and unlimited data repository (Agosti et al. 2019), and then to GloBI, an open-source database of biotic interactions (Poelen et al. 2014, GloBI 2020). We also developed a direct integration from Pensoft Journals to GloBI, leveraging that publisher’s indexing of computer-readable terms (called semantic metadata; Senderov et al. 2018) to extract mammal host and virus information. Overall, considerable progress was made. In total, 85,492 new interactions were added to GloBI from 14 April to 21 May 2020 (see entire dataset on Zenodo: Poelen et al. 2020). Of those, 28,839 interactions are present when subset to "hasHost", "hostOf", "pathogenOf", "virus", and 4,101 unique name combinations are present after considering mammal species synonymies (from Meyer et al. 2015). Of those interactions, 892 species of mammals and 1,530 unique virus names are involved, which compares to 754 mammals and 586 viruses in the most recent data synthesis (Olival et al. 2017). While these liberated data may still include redundancies, they demonstrate the value of our approach and the expanse of known but digitally unconnected data that remains locked in publications. We can liberate host-virus data from publications, but doing so is expensive and does not scale to the continued influx of new articles that are inadequately digitized. Our efforts make it clear that Pensoft-style semantic publishing should be expanded to all major journals. The pandemic has created an opportunity for re-thinking the way we do science in the digital age. Thankfully, our future is not the past, so we do not have to keep wasting resources to digitially 'rediscover' biodiversity knowledge. We collectively call for changes to the publishing paradigm, so that research findings are directly accessible, citable, discoverable, and reusable for creating complete forms of digital knowledge.



2020 ◽  
Author(s):  
Silvia Herrero-Cófreces ◽  
Manuel Fabio Flechoso ◽  
Ruth Rodríguez-Pastor ◽  
Juan José Luque-Larena ◽  
Francois Mougeot

Abstract Background: Fleas frequently infest small mammals and play important vectoring roles in the epidemiology of (re)emerging zoonotic disease. Rodent outbreaks in intensified agroecosystems of NW Spain have been recently linked to periodic zoonotic disease spillover to local human populations. Obtaining qualitative and quantitative information about the composition and structure of the whole flea and small mammal host coexisting communities is paramount to understand disease transmission cycles and to dilucidate the disease-vectoring role of flea species. Methods: Here we report on a large spatial (6 locations) and temporal (6 years with 3 samplings/year) survey conducted in intensively farmed landscapes in NW Spain, aiming to: (i) characterise the flea community parasitizing the small mammal host guild (Microtus arvalis, Apodemus sylvaticus, Mus spretus, Crocidura russula) in terms of flea-host specificity, abundance, prevalence, intensity and aggregation; (ii) evaluate patterns of co-infection by different flea species in hosts; and (iii) study the variation of flea abundance according to season and host sex. Results: Three flea species dominated the system (99.4%): Ctenophthalmus apertus, Leptopsylla taschenbergi and Nosopsyllus fasciatus. Results showed a high aggregation pattern of fleas in all hosts. C. apertus and N. fasciatus were shared by all host species in the guild, but L. taschenbergi mainly parasitized mice (M. spretus, A. sylvaticus). We found significant male-bias infestation patterns in mice, and significant seasonal variations in flea abundances for all rodent hosts (M. arvalis, M. spretus, A, sylvaticus). Simultaneous infections by 2 or 3 flea species were found in 36.8% of all hosts, and N. fasciatus was the most common flea co-infecting hosts. Conclusions: Our study shows that flea infestation patterns differ among hosts and seasons, influencing their potential vectoring role of diseases. Further investigation should be carried out on abundant and polyphagous fleas (e.g. N. fasciatus), since they may have higher competence to circulate zoonoses in natural systems.



2020 ◽  
Vol 58 (2) ◽  
pp. 153-159
Author(s):  
Yan Lv ◽  
Xian-Guo Guo ◽  
Dao-Chao Jin ◽  
Wen-Yu Song ◽  
Rong Fan ◽  
...  

The chigger mite <i>Leptotrombidium sialkotense</i> is one of the 6 main vectors of scrub typhus in China. Before present study, <i>L. sialkotense</i> was found in some parts of Hunan province, China with a narrow geographical distribution. During field investigation 2016-2017, we found <i>L. sialkotense</i> in Jingha, southern Yunnan, China. Of 15 small mammal host species, <i>L. sialkotense</i> were collected from 6 species of the hosts. Rattus brunneusculus was a dominant host of <i>L. sialkotense</i>, from which 98.3% of the mites were collected. The chigger mite showed a relatively high infestation prevalence (<i>P<sub>M</sub></i>=11.7%) and mean abundance (<i>MA</i>=0.5) in comparison with the rest 5 host species. These results reveal a certain host specificity of <i>L. sialkotense</i> to a rat <i>R. brunneusculus</i>. The mite <i>L. sialkotense</i> showed an aggregated distribution on the host (<i>P</i><0.05). A positive correlation observed between <i>L. sialkotense</i> and the body length of hosts. There was a positive interspecific association between <i>L. sialkotense</i> and 2 other dominant vectors, <i>L. deliense</i> and <i>L. scutellare</i>.



EcoHealth ◽  
2019 ◽  
Vol 16 (2) ◽  
pp. 260-274 ◽  
Author(s):  
Muhammad Afif Yusof ◽  
Farah Shafawati Mohd-Taib ◽  
Siti Nabilah Ishak ◽  
Shukor Md-Nor ◽  
Shahrul Anuar Md-Sah ◽  
...  


Virus Genes ◽  
2018 ◽  
Vol 54 (6) ◽  
pp. 792-803 ◽  
Author(s):  
Julia Kęsik-Maliszewska ◽  
Aleksandra Antos ◽  
Jerzy Rola ◽  
Magdalena Larska

Abstract Schmallenberg virus (SBV) is the member of Peribunyaviridae family, which comprises pathogens of importance for human and veterinary medicine. The virus is transmitted only between animals and mainly by biting midges of the genus Culicoides. This study was performed in order to determine SBV genetic diversity and elucidate the host–vector adaptation. All three viral segments were analysed for sequence variability and phylogenetic relations. The Polish SBV strains obtained from acute infections of cattle, congenital cases in sheep, and from Culicoides midges were sequenced using Sanger and next-generation sequencing (NGS) methods. The obtained sequences were genetically similar (99.2–100% identity) to the first-detected strain BH80/11—4 from German cattle. The sampling year and origin of Polish sequences had no effect on molecular diversity of SBV. Considering all analysed Polish as well as European sequences, ovine-derived sequences were the most variable, while the midge ones were more conserved and encompassed unique substitutions located mainly in nonstructural protein S. SBV sequences isolated from Culicoides are the first submitted to GenBank and reported.



2018 ◽  
Vol 285 (1874) ◽  
pp. 20172613 ◽  
Author(s):  
A. W. Park ◽  
M. J. Farrell ◽  
J. P. Schmidt ◽  
S. Huang ◽  
T. A. Dallas ◽  
...  

The distribution of parasites across mammalian hosts is complex and represents a differential ability or opportunity to infect different host species. Here, we take a macroecological approach to investigate factors influencing why some parasites show a tendency to infect species widely distributed in the host phylogeny (phylogenetic generalism) while others infect only closely related hosts. Using a database on over 1400 parasite species that have been documented to infect up to 69 terrestrial mammal host species, we characterize the phylogenetic generalism of parasites using standard effect sizes for three metrics: mean pairwise phylogenetic distance (PD), maximum PD and phylogenetic aggregation. We identify a trend towards phylogenetic specialism, though statistically host relatedness is most often equivalent to that expected from a random sample of host species. Bacteria and arthropod parasites are typically the most generalist, viruses and helminths exhibit intermediate generalism, and protozoa are on average the most specialist. While viruses and helminths have similar mean pairwise PD on average, the viruses exhibit higher variation as a group. Close-contact transmission is the transmission mode most associated with specialism. Most parasites exhibiting phylogenetic aggregation (associating with discrete groups of species dispersed across the host phylogeny) are helminths and viruses.



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