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Volume 16, Number 3—March 2010


Surveillance for West Nile Virus in American White Pelicans, Montana, USA, 2006–2007

Gregory JohnsonComments to Author , Nicole Nemeth, Kristina Hale, Nicole Lindsey, Nicholas Panella, and Nicholas Komar
Author affiliations: Montana State University, Bozeman, Montana, USA (G. Johnson, K. Hale); Centers for Disease Control and Prevention, Fort Collins, Colorado, USA (N. Nemeth, N. Lindsey, N. Panella, N. Komar)

Main Article

Table 4

Virus titers of field-collected samples from WNV-positive American white pelican chicks and test agreement with carcass-matched specimens, Montana, USA, 2006–2007*

Sample No. (%) WNV positive, n = 19 Median viral titer, log PFU/0.5 cm3 (range) κ
Skin† 15 (88.2) 3.6 (1.7–5.0) 0.88
Feather pulp 15 (78.9) 4.9 (1.3–5.6) 0.84
Oral swab 7 (36.8) 1.2 (0.7–2.1) 0.79
Cloacal swab 4 (21.1) 1.5 (0.7–2.7) 0.79

*WNV, West Nile virus; κ, concordance. All carcasses were positive for WNV infection by virus isolation or detection of specific WNV RNA by reverse transcription–PCR. Only plaque assay results are presented for field-collected samples.
†Skin was collected from only 17 carcasses in the field.

Main Article