Update as of August 17, 2021
Maryland 2021 - In late May, wildlife managers in the District of Columbia, Maryland, Virginia, West Virginia, and other states began receiving reports of sick and dying birds. Several passerine bird species have been affected. No human health or domestic animal (pets, livestock and poultry) issues have been documented. As of mid-August, reports have decreased in many jurisdictions and the Maryland Department of Natural Resources is lifting its previous recommendation to cease feeding birds.
The natural resource management agencies in the affected states and the District of Columbia, along with the National Park Service, continue to work with diagnostic laboratories to investigate the cause(s) of this event. Those laboratories include the USGS National Wildlife Health Center, the University of Georgia Southeastern Cooperative Wildlife Disease Study, the University of Pennsylvania Wildlife Futures Program, the Indiana Animal Disease Diagnostic Laboratory and multiple state laboratories.
While no definitive cause(s) of illness or death have been determined, the following pathogens have not been detected, based on results received to date: Salmonella and Chlamydia (bacterial pathogens); avian influenza virus, West Nile virus and other flaviviruses, Newcastle disease virus and other paramyxoviruses, herpesviruses and poxviruses; and Trichomonas parasites. Transmission electron microscopy, metagenomics work, and additional diagnostic tests are ongoing.
Residents who choose to resume feeding birds and providing water in bird baths should remain vigilant and consider the following standard guidelines:
- Clean feeders and bird baths with soap and water at least once a week, then disinfect with a 10% bleach solution to prevent potential infectious disease spread between birds and other wildlife. After cleaning, rinse well with water and allow to air-dry. When handling bird feeders and baths be sure to wear disposable gloves and wash your hands when finished.
- When feeding birds follow expert recommendations such as those listed in the Audubon International Guide to Bird Feeding.
- Avoid handling birds unless necessary. Dispose of dead birds in a plastic bag, seal, and discard with household trash, or alternatively, bury them deeper than 3 feet to prevent disease transmission to other animals. If handling is necessary, wear disposable gloves or use plastic bags on your hands to avoid contact with carcasses.
- Keep pets away from sick or dead wildlife.
- Report sick or dying birds to the Maryland DNR / USDA Wildlife Services Call Center at 1-877-463-6497 (410-349-8130 for out-of-state phone numbers). Licensed wildlife rehabilitators can be found on the DNR website.
Maryland DNR greatly appreciates the assistance of the public and wildlife rehabilitation facilities during this outbreak. Wildlife disease investigations take time and can be inherently challenging. Additional information and guidance will be shared as more results are confirmed.
July 2
Maryland 2021 - In late May, wildlife managers in Washington D.C., Maryland, Virginia, West Virginia, and Kentucky began receiving reports of sick and dying birds with eye swelling and crusty discharge, as well as neurological signs.
More recently, additional reports have been received from Delaware, New Jersey, Pennsylvania, Ohio, and Indiana. While the majority of affected birds are reported to be fledgling common grackles, blue jays, European starlings, and American robins, other species of songbirds have been reported as well. No definitive cause(s) of illness or death have been determined at this time. No human health or domestic livestock and poultry issues have been reported.
The natural resource management agencies in the affected states and the District of Columbia, along with the National Park Service, are continuing to work with diagnostic laboratories to investigate the cause(s) of this event. Those laboratories include the USGS National Wildlife Health Center, the University of Georgia Southeastern Cooperative Wildlife Disease Study, the University of Pennsylvania Wildlife Futures Program, and the Indiana Animal Disease Diagnostic Laboratory.
The following pathogens have not been detected in any birds tested, based on results received to date: Salmonella and Chlamydia (bacterial pathogens); avian influenza virus, West Nile virus and other flaviviruses, Newcastle disease virus and other paramyxoviruses, herpesviruses and poxviruses; and Trichomonas parasites. Transmission electron microscopy and additional diagnostic tests, including microbiology, virology, parasitology, and toxicology are ongoing.
Birds congregating at bird feeders and bird baths can transmit diseases to one another. Therefore, the state and District agencies recommend the following standard precautions:
- Cease feeding birds until this wildlife morbidity/mortality event subsides;
- Clean feeders and bird baths with a 10% bleach solution (one part bleach mixed with nine parts water), rinse with water, and allow to air dry;
- Avoid handling birds unless necessary. If you do handle them wear disposable gloves. If picking up a dead bird, place an inverted plastic bag over your hand to avoid direct contact with the bird; and
- Keep pets (including pet birds) away from sick or dead wild birds as a standard precaution.
If you encounter sick or dead birds, please contact your state or District wildlife conservation agency for further instructions and to help them track this event. To dispose of dead birds, place in a plastic bag, seal, and discard with household trash or alternatively bury them deeply. Additional information will be shared as diagnostic results are received.
