Selective isolation of Avian influenza virus (AIV) from cloacal samples containing AIV and Newcastle disease virus

Mohamed E. El Zowalaty, Yogesh Chander, Patrick T. Redig, Hemmat K. Abd El Latif, Mona A. El Sayed, Sagar M. Goyal

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Avian influenza viruses (AIVs) are important zoonotic pathogens whose natural reservoir is waterfowl. In addition to AIV, waterfowl are often coinfected with other viruses, such as the paramyxoviruses, of which Newcastle disease virus (NDV) is of particular importance because of the highly virulent nature of certain strains of this virus for domestic poultry. In routine surveillance of waterfowl for AIV, a number of cloacal samples were encountered that were positive for AIV by real-time reverse transcription polymerase chain reaction (RT-PCR), but did not yield AIV by inoculation in embryonated chicken eggs. On further testing, these samples were also positive for NDV by conventional RT-PCR. It was hypothesized that if both NDV and AIV are present in a sample, the former may overgrow AIV yielding false-negative AIV results. Such samples were treated with chicken anti-NDV polyclonal antiserum and then inoculated in embryonated chicken eggs. Several samples were found to be positive for different subtypes of AIV, indicating that, in the presence of mixed infection with NDV and AIV, it is imperative to remove the influence of NDV, so a true picture of AIV prevalence emerges. An additional benefit is that information on the circulation of NDV in these birds sheds light on their epidemiologic and ecologic significance.

Original languageEnglish (US)
Pages (from-to)330-332
Number of pages3
JournalJournal of Veterinary Diagnostic Investigation
Volume23
Issue number2
DOIs
StatePublished - 2011

Keywords

  • Avian influenza
  • Cloacal samples
  • Mixed infection
  • Newcastle disease
  • Waterfowl

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