Costa Rica Pelicans Test Negative for Avian Flu as Mystery Continues
Pelicans found weak, disoriented or behaving unusually along Costa Rica’s Pacific coast have tested negative for avian influenza, but authorities still do not know what is affecting the birds. The results provide an important update to warnings issued last week after reports of sick pelicans increased in Guanacaste, Jacó, Puntarenas and other coastal areas. Tests conducted on pelican samples have not detected the virus. The National Animal Health Service ( SENASA ), is continuing its investigation with the National System of Conservation Areas to determine whether another illness or an environmental factor is responsible. One possibility under consideration involves algae or marine toxins, which can move through the food chain when seabirds eat contaminated fish. Similar incidents involving pelicans have occurred in Costa Rica without being connected to avian flu. No cause has been confirmed in the current cases. The negative results do not change the warning for people visit...