Specimens inventory of Tabanidae (Diptera) of Entomological Collection of National Museum of Natural History - Universidade Federal do Rio de Janeiro

Guimarães, Ronald Rodrigues; Aguiar, Valéria Magalhães

doi:10.1590/1676-0611-bn-2018-0651

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…Thereby, results reported here that most (92.86%) foals remain seronegative to this virus despite remaining with their EIAV seropositive mares throughout the entire weaning process suggest that implementation of such policies is not an absolute requirement for restorative breeding programs. Moreover, in contrast to conditions outlined above in work conducted in the United States [20], equids in this study were feral, living in an environment where EIAV is endemic and where the hot, humid tropical rainforest climate support very high insect vector populations all year round [17,20,37].…”

Section: Discussionmentioning

confidence: 75%

Low transmission rates of Equine infectious anemia virus (EIAV) in foals born to seropositive feral mares inhabiting the Amazon delta region despite climatic conditions supporting high insect vector populations

et al. 2022

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Background Marajó Island, within in the Amazon River Delta, supports numerous bands of feral equids including the genetically distinct Marajoara horses. Approximately 40% of the equids on the island are infected with Equine infectious anemia virus (EIAV). This high seropositivity rate coupled with the need to preserve rare breeds such as the Marajoara horse precludes euthanasia as the primary means for controlling EIAV in this region. In the absence of iatrogenic transmission, spread of this lentivirus is mediated primarily by hematophagous insects, whose year-round prevalence on the island is supported by favorable climatic conditions. In addition, cases of vertical EIAV transmission have been observed suggesting inclusion of seropositive mares in restorative breeding programs could result in their progeny becoming infected with this virus either pre-parturition or post-partum via hematophagous insects. Therefore, the aim of this study was to evaluate EIAV vertical and post-partum insect-mediated transmission rates among foals born to seropositive feral mares until natural weaning. Serum samples from foals born to seropositive feral mares within the Soure municipality, of Marajó Island, were collected to investigate their serological status, using an indirect ELISApgp45, with positive samples confirmed using the classical agar gel immunodiffusion (AGID) assay. Results The serological status of 28 foals were monitored over a 2-year period with some subjects, depending on their date of birth, being sampled up to six times. All foals remained with their respective mares until fully weaned at approximately 10 months of age. Only 2 foals (7.14%) in the study group became seropositive against EIAV. Conclusion The results demonstrate that in most cases it is possible to obtain seronegative foals born to and eventually weaned by EIA positive mares, even in equatorial regions where substantial rainfall and high temperatures favor the proliferation of insect vectors.

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Section: Discussionmentioning

confidence: 75%

Low transmission rates of Equine infectious anemia virus (EIAV) in foals born to seropositive feral mares inhabiting the Amazon delta region despite climatic conditions supporting high insect vector populations

et al. 2022

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“…In this current study it is shown that 24 of 26 (92.86%) foals born to EIAV seropositive mares remained seronegative to this virus even staying a long period with their respective EIAV-seropositive mothers, in the case of all but 2 Group A subjects, over 2 years. This is despite living a feral existence, unlike the animals described by McConnico et al (2000), in an environment where EIAV is endemic and the hot, humid tropical rainforest climate supports very high insect vector populations all year round [14,18,35].…”

Section: Discussionmentioning

confidence: 97%

Low Transmission Rates of Equine Infectious Anemia Virus (EIAV) in Foals Born To Seropositive Feral Mares Inhabiting the Amazon Delta Region Despite Climatic Conditions Supporting High Insect Vector Populations

Resende¹,

Santos²,

Cook³

et al. 2021

Preprint

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Background Marajó Island within in the Amazon River Delta supports numerous bands of feral equids including the genetically distinct Marajoara horses. Roughly 40% of the equids on the island are infected with the Equine infectious anemia virus (EIAV). In the absence of iatrogenic transmission, spread of this lentivirus is mediated mainly by hematophagous insects whose year-round prevalence on the island is supported by favorable climatic conditions. The euthanasia of all infected equids within the population is not a feasible strategy when the prevalence of the disease is high or in highly specialized or rare breeds of equid such as the Marajoara horse. Preservation of these animals is complicated by high rates of seropositivity with the potential for vertical transmission or insect mediated transmission following parturition of foal. Therefore, the aim of this study was to evaluate EIAV vertical and post-partum insect-mediated transmission rates among foals born to seropositive feral mares until natural weaning. Serum samples of foals born to seropositive feral mares from Soure municipality, within Marajó Island, were collected to investigate their serological status, using an indirect ELISApgp45 with positive samples being tested in the classical agar gel immunodiffusion (AGID) assay to confirm the results. Results Twenty-eight foals were sampled and their serological status was monitored over a 2-year period. Depending on the birth date, some of them were sampled up to six times. All foals remained with their respective mares until fully weaned, approximately 10 months of age, and just 2 of 28 foals (7.14%) in the study group became seropositive against EIAV. Conclusion The results showed that in most cases it is possible to obtain negative foals born to and eventually weaned by EIA positive mares, even in equatorial regions where substantial rainfall and high temperatures favor the proliferation of insect vectors.

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Specimens inventory of Tabanidae (Diptera) of Entomological Collection of National Museum of Natural History - Universidade Federal do Rio de Janeiro

Cited by 2 publications

References 6 publications

Low transmission rates of Equine infectious anemia virus (EIAV) in foals born to seropositive feral mares inhabiting the Amazon delta region despite climatic conditions supporting high insect vector populations

Low transmission rates of Equine infectious anemia virus (EIAV) in foals born to seropositive feral mares inhabiting the Amazon delta region despite climatic conditions supporting high insect vector populations

Low Transmission Rates of Equine Infectious Anemia Virus (EIAV) in Foals Born To Seropositive Feral Mares Inhabiting the Amazon Delta Region Despite Climatic Conditions Supporting High Insect Vector Populations

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