Outbreak of bovine tick-borne disease on a riverside property in the Western Amazonia: Case report

Autori

  • Guilherme Henrique Reckziegel Faculdade de Medicina Veterinária e Zootecnia - Universidade Federal do Mato Grosso do Sul
  • David Brado Bayma Universidade Federal do Acre
  • Tamyres Izarelly Barbosa da Silva Universidade Federal do Acre
  • Romulo Barros Fernandes Instituto de Defesa Agropecuária e Florestal do Estado do Acre
  • Siham Kassab Universidade Federal do Acre
  • Mariana Dinis Souza Universidade Federal do Acre
  • Tallison Filipe Lima Oliveira Universidade Federal do Acre
  • Heitor Tartari Instituto de Defesa Agropecuária e Florestal do Estado do Acre
  • Carlos Alberto do Nascimento Ramos Faculdade de Medicina Veterinária e Zootecnia - Universidade Federal do Mato Grosso do Sul

Parole chiave:

Amazon, anaplasmosis, babesiosis, cattle, PCR

Abstract

The objective was to report an outbreak of tick-borne disease (TBD) on riverside property in the Western Amazon. The death of 25 Nellore cattle was reported on a rural property on the banks of the Purus River, state of Acre. The producer observed animals with staggering walking, drop in productivity, weight loss and evolution to death in approximately 30 days. Fifteen animals from the same batch were selected for clinical evaluation and the ear tip was punctured for hemoparasite research, in addition to blood collection for hematological, biochemical and molecular evaluation. The main laboratory findings were leukocytosis, thrombocytopenia, hypoproteinemia, elevated creatine kinase and reduced urea, creatinine and albumin, as well as visualization of forms suggestive of Anaplasma spp. in 13.33% of the samples. Through PCR, 20% positivity was observed for Anaplasma marginale and 53.33% for Babesia sp. Hematological and biochemical changes, although highly suggestive, may suffer changes from other factors not related to TBD. Therefore, the presumptive identification of the etiological agent in the blood or confirmatory by molecular methods is essential in the diagnosis. Depending on the stage of the disease, low parasitemia occurs, making it difficult to see hemoparasites in blood smears. The Babesia sp. was the main agent of the outbreak of TBD in the population evaluated, which, when associated with early clinical and laboratory diagnosis, results in adequate therapeutic direction and prophylactic measures, promoting a balance between host, agent and vector.

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Pubblicato

2022-07-26

Fascicolo

Sezione

Medicina Veterinária Preventiva