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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Anthelmintic resistance of Haemonchus contortus from sheep flocks in Brazil: concordance of in vivo and in vitro (RESISTA-Test©) methods

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Author(s):
Yousmel Alemán Gainza [1] ; Isabella Barbosa dos Santos [2] ; Amanda Figueiredo [3] ; Leonardo Aparecido Lima dos Santos [4] ; Sérgio Novita Esteves [5] ; Waldomiro Barioni-Junior [6] ; Alessandro Pelegrine Minho [7] ; Ana Carolina de Souza Chagas [8]
Total Authors: 8
Affiliation:
[1] Universidade Estadual Paulista. Faculdade de Ciências Agrárias e Veterinárias - Brasil
[2] Universidade Estadual Paulista. Faculdade de Ciências Agrárias e Veterinárias - Brasil
[3] Universidade Estadual Paulista. Faculdade de Ciências Agrárias e Veterinárias - Brasil
[4] Centro Universitário Central Paulista - Brasil
[5] Embrapa Pecuária Sudeste - Brasil
[6] Embrapa Pecuária Sudeste - Brasil
[7] Embrapa Pecuária Sudeste - Brasil
[8] Embrapa Pecuária Sudeste - Brasil
Total Affiliations: 8
Document type: Journal article
Source: Revista Brasileira de Parasitologia Veterinária; v. 30, n. 2 2021-05-03.
Abstract

Abstract This study evaluated the resistance status of Haemonchus contortus from sheep flocks in the state of São Paulo, Brazil, through comparison between the fecal egg count reduction test (FECRT) and the larval development test (LDT). For the FECRT, 35 sheep were selected in each of five flocks and divided into groups treated with: benzimidazole, levamisole, ivermectin, monepantel and control. Feces were collected for EPG and fecal cultures. The LDT was performed using thiabendazole (TBZ), levamisole (LEV), ivermectin aglycone (IVM-A) and Zolvix (ZLV). Resistance to all drugs was detected using FECRT in 100% of the flocks, except in relation to ZLV (40% resistant and 20% suspected of resistance). LDT indicated resistance to TBZ and IVM-A in all flocks, to LEV in 80% of flocks and to ZLV in 10%. Total agreement was obtained between the two tests for TBZ and IVM (k = 1.0), while for LEV (k = 0.8) and ZLV (k = 0.9), substantial and almost perfect agreement were obtained, respectively. The concordance between the tests was significant, thus showing that it is possible to use the outcome of the LDT to predict the FECRT, and hence validating the former as a fast diagnostic test for use by sheep farmers in Brazil. (AU)

FAPESP's process: 18/16070-1 - Study of the impact of gastrointestinal nematodes infection on the performance of Morada Nova Lambs for development of a targeted selective treatment
Grantee:Isabella Barbosa dos Santos
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 14/25821-0 - Genomics of anthelmintic resistance in Haemonchus contortus and evidences for DNA methylation
Grantee:Simone Cristina Méo Niciura
Support Opportunities: Regular Research Grants
FAPESP's process: 16/07132-8 - Development and validation of a diagnostic kit of parasitic resistance to anthelminthics for resistance monitoring in sheep flocks
Grantee:Yousmel Alemán Gainza
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 17/13249-8 - Nanotechnology applied to elaboration of synthetic acaricides associated with plant isolates for the control of Rhipicephalus (b.) microplus
Grantee:Amanda Figueiredo
Support Opportunities: Scholarships in Brazil - Doctorate