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Volume 9, Number 10—October 2003

Dispatch

West Nile Virus Transmission in Resident Birds, Dominican Republic

Oliver Komar*Comments to Author , Mark B. Robbins*, Kaci Klenk†, Bradley J. Blitvich‡, Nicole L. Marlenee‡, Kristen L. Burkhalter†, Duane J. Gubler†, Guillermo Gonzálvez§, Carlos J. Peña§, A. Townsend Peterson*, and Nicholas Komar†
Author affiliations: *University of Kansas, Lawrence, Kansas, USA; †Centers for Disease Control and Prevention, Fort Collins, Colorado, USA; ‡Colorado State University, Fort Collins, Colorado, USA; §Centro Nacional de Control de Enfermedades Tropicales, Santo Domingo, Dominican Republic

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Table

Laboratory results for flavivirus-seropositive birds collected in the Dominican Republic, 2002a

Species KUNHM catalog no. Date sampled Age and sexb Locality SLEV
PRNT90 WNV PRNT90 % inhibition by ELISAc Result
Ruddy quail-dove
(Geotrygon montana)
94667
21 Nov
Immature male
Los Haitises
<10d
20d
40
WNV
Mangrove cuckoo
(Coccyzus minor)
94671
19 Nov
Adult femalee
Los Haitises
<10
160
81
WNV
Hispaniolan lizard cuckoo
(Saurothera longirostris)
94669
18 Nov
Adult female
Los Haitises
160
640
73
WNV
Hispaniolan lizard cuckoo
(Saurothera longirostris)
94670
21 Nov
Adult male
Los Haitises
<10
40
23
FLAV
Hispaniolan trogon
(Priotelus roseigaster)
94951
12 Nov
Adult male
Sierra de Baoruco
<10
10
6
FLAV
Red-legged thrush
(Turdus plumbeus)
94956
20 Nov
Adult femalee
Los Haitises
10
160
86
WNV
Red-legged thrush
(Turdus plumbeus)
94689
19 Nov
Adult malee
Los Haitises
<10
80
not available
FLAV
Red-legged thrush
(Turdus plumbeus)
94691
21 Nov
Adult female
Los Haitises
20
1280
61
WNV
Greater Antillean grackle
(Quiscalus niger) 94949 19 Nov Adult male Los Haitises 640 40 42 FLAVf

aELISA, enzyme-linked immunosorbent assay; FLAV, undifferentiated flavivirus; KUNHM, University of Kansas Natural History Museum, Division of Ornithology; PRNT90, reciprocal 90% plaque reduction neutralization titer; SLEV, Saint Louis encephalitis virus; WNV, West Nile virus.
bBirds were in nonbreeding condition unless otherwise indicated.
cInhibition values >30% were considered significant.
dValues represent reciprocal titers; threshold of detection was 1:10.
eBreeding condition, as determined by size of gonads.
fAlthough serologic results based upon PRNT would suggest that this specimen be identified as SLEV antibody–positive, the WNV antibody–positive result in the blocking ELISA indicates that this specimen was possibly positive for both SLEV and WNV. However, secondary flavivirus infections are notorious for heterologous reactivity, so infection by WNV or other flaviviruses causing these reactions could not be ruled out. Hence, the determination as FLAV.

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