USPOULTRY and the USPOULTRY Foundation announce the completion of a research project evaluating the spread of Egg Drop Syndrome 1976 (EDS 76) and flock responses to vaccination. The research is part of the Association’s comprehensive research program, which encompasses all phases of poultry and egg production and processing, and is made possible in part through proceeds from the International Poultry Expo, part of the International Production & Processing Expo.

F-111: Virus Isolation, Serological Surveillance and Mechanical Transmission of Egg Drop Syndrome

Once considered exotic to the United States, EDS 76 — caused by duck Atadenovirus A — reemerged in 2018, affecting commercial layer and broiler breeder flocks and resulting in reduced egg production and soft- or shell-less eggs.

Researchers at the University of Georgia recently completed a study examining how the virus spreads, how flocks respond to vaccination, and the effectiveness of cleaning and disinfection practices. The study had three primary objectives: to determine which cell lines can support virus isolation from field and environmental samples, including evaluating cleaning and disinfection efficacy; to assess antibody responses and viral shedding in vaccinated and unvaccinated flocks on farms with and without EDS 76; and to investigate potential transmission routes, including insects and other environmental sources.

Results showed that while virus detection in field samples remains challenging, viral DNA was identified on eggs, egg cartons, insects and live market ducks, highlighting potential pathways for transmission. These findings underscore the importance of robust biosecurity, environmental monitoring and vaccination strategies in managing this reemerging poultry disease.

The research summary can be found on the USPOULTRY website. Information on other Association research may also be obtained by visiting the USPOULTRY website.