Moroccan Journal of Agricultural and Veterinary Sciences

Vol. 9 No. 3 (2021): (Poultry farming - September 2021)
Poultry Viral Pathologies

Kinetics of maternal antibodies against low pathogenic avian influenza virus H9N2 and interference with vaccination in broiler chickens

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  • Amal ESSALAH-BENNANI,
  • Saadia NASSIK,
  • Moncef BOUZOUAIA,
  • Ouafae FASSI FIHRI
Amal ESSALAH-BENNANI Ceva Santé Animale, Z.I. Oulad Saleh, Bouskoura, Maroc
Saadia NASSIK Unité de pathologie aviaire, Département de Pathologie et de Santé Publique Vétérinaire, Institut Agronomique et Vétérinaire Hassan II, Rabat, Maroc
Moncef BOUZOUAIA Département de management et pathologie aviaire, Ecole Nationale Vétérinaire Sidi Thabet, Tunisie
Ouafae FASSI FIHRI Unité de Microbiologie et Maladies Contagieuses, Département de Pathologie et de Santé Publique Vétérinaire Institut Agronomique et Vétérinaire Hassan II, Maroc

Published 2021-09-15

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Abstract

Systematic vaccination of Breeders against AILP H9N2 allows the transmission of passive immunity to their progeniture. However, the maternal anti-H9N2 antibodies present in day old chicks offer them some protection during the first days of age and may interfere with vaccination. The aim of this study is to assess the kinetics of AOMs in the presence and/or in the absence of vaccination. In the first part, we followed the kinetics of anti-H9N2 antibodies in unvaccinated chicks reared in isolation. In the second part, batches of broilers vaccinated with 4 different vaccines, administered at 3 different ages, distributed in several regions of Morocco were the subject of serological monitoring, on all the results obtained, an effect Age of vaccination has been proven by statistical analysis which calls into question the interference between H9N2 anti-IAFP vaccines and maternal antibodies.

Keywords: Low pathogenic avian influenza H9N2 (IAFP H9N2), Maternal antibody, ELISA, HI, Half-life

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References