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Volume 8, Number 7—July 2002

Detection of West Nile Virus in Oral and Cloacal Swabs Collected from Bird Carcasses

Nicholas Komar*Comments to Author , Robert Lanciotti*, Richard Bowen†, Stanley Langevin*, and Michel Bunning*‡
Author affiliations: *Centers for Disease Control and Prevention, Fort Collins, Colorado, USA; †Colorado State University, Fort Collins, Colorado, USA; ‡United States Air Force, Bowling Air Force Base, Washington, DC, USA

Main Article


Mean logarithmic titers of West Nile virus (WNV) infectious particles, determined by Vero plaque assay and TaqMan reverse transcriptase–polymerase chain reactiona

Specimen type
(Mean Vero log PFU [range]/Mean TaqMan log PFU equivalents [range])
Species Brain Oral swab Cloacal swab
American Crow 8.2 [5.9–8.8]/7.1 [5.3–7.7] 7.3 [4.1–7.7]/6.6 [4.6–7.1] 6.4 [3.8–7.4]/6.9 [6.1–7.3]
Fish Crow 6.6 [4.1–6.9]/5.8 [4.8–6.2] 7.0 [1.4–7.6]/6.1 [3.2–6.7] 6.8 [<0.4–7.4]/6.0 [2.3–6.6]
Blue Jay 8.0 [7.3–8.2]/6.3b [6.2–6.3] 7.1b [5.3–7.4]/5.7b [4.4–6.0] 5.8 [3.0–6.3]/6.7b [5.6–7.0]

aIn postmortem samples of brain tissue (1 cm3), and oral and cloacal swabs for 12 American Crows, 4 Fish Crows, and 4 Blue Jays experimentally infected with the New York 1999 strain of WNV.
bThis value determined from only two birds.

Main Article

1 Pertaining to the family Corvidae, including crows, jays and magpies.

2 These birds were infected either by mosquito bite or by direct contact with infected cagemates, both of which are potentially natural modes of infection.

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