West Nile virus survey of birds and mosquitoes in the Dominican Republic.

We report West Nile virus (WNV) activity from a new area on Hispaniola, in the vicinity of Monte Cristi National Park in northwest Dominican Republic. Specific anti-WNV antibodies were detected in 12 of 58 (21%) resident birds sampled in March 2003, representing six species in the orders Cuculiformes (cuckoos), Strigiformes (owls), and Passeriformes (song birds). This seroprevalence is the highest reported from any site in the Caribbean Basin. Virus was not detected in any mosquitoes or tissues from bird specimens. Testing of 20 sick or dead birds was negative for WNV. Undetermined flavivirus antibodies were detected in four resident birds at Monte Cristi, as well as in five resident birds at Sierra de Baoruco National Park in southwest Dominican Republic. These data suggest that an unidentified flavivirus, as well as WNV, is active in the Dominican Republic.

Prevalence of Batrachochytrium dendrobatidis in Agalychnis moreletii (Hylidae) of El Salvador and association with larval jaw sheath depigmentation.

Amphibian populations around the world have been declining at an alarming rate due to factors such as habitat destruction, pollution, and infectious diseases. Between May and July 2008, we investigated a fungal pathogen in the critically endangered Morelet's treefrog (Agalychnis moreletii) at sites in El Salvador. Larvae were screened with a hand lens for indications of infection with Batrachochytrium dendrobatidis (Bd), a fungus that can cause lethal chytridiomycosis in amphibians. Subsets of inspected tadpoles were preserved for analysis by polymerase chain reaction to determine the effectiveness of hand lens screening for presence of Bd and to estimate infection prevalence at various sites. Because individuals with signs of infection were preferentially included, we used a novel method to generate unbiased estimates of infection prevalence from these biased samples. External mouthpart deformities, identified with a hand lens, successfully predicted Bd infection across a large spatial scale. Two of 13 sites sampled had high (≥ 89%) estimated prevalence, whereas little or no Bd was detected at the remaining sites. Although it appears that A. moreletii populations in this region are not suffering rapid declines due to Bd, further monitoring is required to determine the extent to which these populations are stably coexisting with the pathogen.