Statement on Unidentified Songbird Illness Reported from Eastern U.S.


A joint statement of the Cornell Lab of Ornithology and the Cornell University College of Veterinary Medicine.

Many people are concerned about the emergence of a new illness causing crusty eyes, tremors, and paralysis among songbirds in several eastern states including Virginia, Maryland, Delaware, New Jersey, Pennsylvania, West Virginia, Kentucky, Ohio, Indiana, and District of Columbia. This illness and the uncertainty around it are upsetting, and we share your concern.

The Cornell Lab of Ornithology does not have experts studying the situation. We have prepared this statement with the help of the Cornell University College of Veterinary Medicine to summarize the state of knowledge of experts in state and federal agencies who are working to understand this event. For a detailed summary of the situation, please see this statement from the U.S. Geological Survey.

The main points to know

  • Please follow your own state’s guidelines on whether to take down bird feeders. Find your state agency here.
  • Although little is known yet about the cause, as of mid-July, it appears that the incidence of the illness may be waning.
  • No human health or domestic livestock/poultry issues have been reported.
  • The illness is not caused by any of the major known bird diseases such as West Nile, salmonella, avian influenza, House Finch eye disease, Trichomonas parasites, etc.
  • The species most frequently affected are fledgling (juvenile) Blue Jays, Common Grackles, European Starlings, and American Robins, along with a few other species. Symptoms include crusty eyes and neurological signs such as tremors or partial paralysis.
  • We don’t yet know if the illness is caused by a disease organism (i.e., virus, bacteria, or parasite), or if it’s the result of a toxic substance in the landscape.
  • If it’s a disease, we don’t know how it’s transmitted. It might be directly transmissible from bird to bird (like a cold or the flu), or might require a vector (such as with malaria, where a mosquito transmits the illness).

What to do if you find a sick or dead bird

  • Avoid handling birds unless necessary. If you must handle them wear disposable gloves, or use an inverted plastic bag over your hand to pick up a dead bird.
  • Keep pets (including pet birds) away from sick or dead wild birds as a standard precaution.
  • Report the sick or dead bird to your state wildlife conservation agency for further instructions and to help them track this event.

What to do about bird feeders

  • Please follow your own state’s recommendations on whether to take down bird feeders. See below for links to state advisories.
  • In states without specific guidance on feeders, the Cornell Lab does not currently recommend taking them down, given the lack of confirmed cases and uncertainty about how the disease is transmitted. However, it is fine to take down feeders as an extra precaution if you prefer, since there is plenty of natural food for birds at this time of year.
  • It’s always a good idea to keep feeders clean by washing with a dilute bleach solution. Here’s more about how to clean feeders.

Specific information for New York state residents

  • There have been no confirmed cases of the illness yet in New York state.
  • Because of the lack of confirmed cases in New York state, and uncertainty about how the disease is transmitted, the Cornell Lab is not recommending that feeders in New York be taken down at this time. Note that Audubon New York has recommended taking down feeders, and there is no harm in doing that out of an abundance of caution.
  • It’s always a good idea to regularly clean your feeders.

State advisories



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