Evaluation of antibody response to vaccination against west nile virus in thick billed parrots (rhynchopsitta pachyrhyncha)

Jennifer Glavis, R. Scott Larsen, Nadine Lamberski, Patricia Gaffney, Ian Gardner

Research output: Contribution to journalArticle

4 Scopus citations


West Nile virus (WNV) was first documented in North America in New York City in 1999. Several deaths attributable to WNV have been reported in captive thick-billed parrots (Rhynchopsitta pachyrhyncha), an endangered psittacine native to North America. The serologic responses in 12 captive adult thick-billed parrots after a series of three initial WNV vaccine injections with annual boosters over 6 yr was evaluated. In addition, the serologic responses of 11 thick-billed parrot chicks following an initial vaccination series to determine if there were seroconversions were also reported. Most adults (67%) had seroconverted after 5 yr of annual vaccination, with a median titer of 1:80 (range 1:401:160) for those that seroconverted. After the first year, birds were likely naturally exposed to WNV, which limited interpretation of titers. None of the chicks seroconverted during the initial three-vaccine series; only two of four chicks (50%) had seroconverted when tested at the 1-yr yearly booster, and at 2 yr, three of four chicks had seroconverted. Although some birds had detectable antibody titers, it is unclear whether this vaccine can reliably provide protection against WNV in thick-billed parrots.

Original languageEnglish (US)
Pages (from-to)495-498
Number of pages4
JournalJournal of Zoo and Wildlife Medicine
Issue number3
StatePublished - Sep 1 2011


  • antibodies
  • psittacines
  • Rhynchopsitta pachyrhynca
  • thick-billed parrots
  • vaccination
  • vaccine
  • West Nile virus

ASJC Scopus subject areas

  • Animal Science and Zoology
  • veterinary(all)

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