Low genetic diversity of Anaplasma marginale in calves in an endemic area for bovine anaplasmosis in the state of São Paulo, Brazil

Ticks and Tick-borne Diseases
Jenevaldo Barbosa da SilvaRosangela Zacarias Machado

Abstract

Major surface protein 1a has been used as a marker for genetic stability in identifying geographical isolates of Anaplasma marginale. We conducted a longitudinal study to ascertain the genetic diversity of A. marginale in a dairy cattle herd with a history of clinical anaplasmosis. A total of 20 calves were evaluated every 3 months, from birth to 1 year of age. They were evaluated using blood smears, IFAT, ELISA, and qPCR. Additionally, samples positive for the msp1a gene using nPCR were sequenced. The detection of A. marginale ranged from 20 to 90% using blood smears, 20-80% using ELISA/IFAT, and 15-100% using qPCR. We found evidence that suggested transplacental transmission of A. marginale in 15% (3/20) of the calves based on qPCR and 20% (4/20) based on blood smears. Additionally, these four animals were A. marginale ELISA/IFAT-positive. The A. marginale strains found were α-β(3)-Γ (n=7), α-β(2) (n=1), and α-β(2)-190-Γ (n=1). The new MSP1a tandem repeat 190 was described. The results showed that the genetic diversity of A. marginale in a group of calves up to 1 year of age from Taiaçu (SP) was low, with only three different strains identified, showing the microsatellite genotype E. Eighty percent of the animals evaluated ha...Continue Reading

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Citations

Mar 8, 2018·Veterinary Sciences·Paidashe HoveNicola E Collins
Aug 8, 2019·Revista brasileira de parasitologia veterinária = Brazilian journal of veterinary parasitology : Órgão Oficial do Colégio Brasileiro de Parasitologia Veterinária·Inalda Angélica de Souza RamosMarcos Rogério André
Apr 9, 2020·Revista brasileira de parasitologia veterinária = Brazilian journal of veterinary parasitology : Órgão Oficial do Colégio Brasileiro de Parasitologia Veterinária·Inalda Angélica de Souza RamosMarcos Rogério André
Apr 25, 2019·Tropical Medicine and Infectious Disease·Babette AbandaAlbert Eisenbarth
Dec 21, 2019·Nanomedicine : Nanotechnology, Biology, and Medicine·Leticia Santos PimentelPaula Cristina Batista de Faria
Jan 25, 2019·Research in Veterinary Science·Krishnamoorthy ParamanandhamParimal Roy
Jun 3, 2021·Revista brasileira de parasitologia veterinária = Brazilian journal of veterinary parasitology : Órgão Oficial do Colégio Brasileiro de Parasitologia Veterinária·Bruno Dall'AgnolJosé Reck

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