Quite a number of news organizations reported recently of a Centers for Disease Control and Prevention (CDC) warning about not dressing your chickens in Halloween costumes (HERE, HERE and HERE for example); however, we could not locate this statement.

This was due to the fact that the CDC never made such a statement.
In the days following the news reports, CDC did come out with a statement on these news reports titled–Erroneous Media Reports About Chickens and Halloween Costumes:
Despite news reports to the contrary, the Centers for Disease Control and Prevention (CDC) has not warned people against dressing chickens in Halloween costumes.
Halloween costumes: The health risks of novelty contact lenses
However, we do advise people with backyard or pet chickens to handle them carefully to keep their family and their chickens safe and healthy.
- Always wash your hands after touching chickens or anything in their environment. Running water and soap are best. Use alcohol-based hand sanitizer if soap and water aren’t available, and wash your hands thoroughly when you get to a sink.
- Keep chickens outdoors. Never bring them in your house.
- Don’t eat or drink in the area where the birds live or roam.
- Don’t kiss your birds or snuggle them and then touch your face or mouth.
- Children under 5 years old should not hold or touch chickens. Young children are more likely to get sick because their immune systems are still developing and they are more likely to put their fingers or pacifiers and other items into their mouths.
- More information about keeping backyard chickens and other poultry is available at https://www.cdc.gov/features/salmonellapoultry/index.html.
Related:
- Costa Rica reports rare human rabies case
- Amazonas state reports 2,000 measles cases
- Dengue cases top 8,000 in Bangladesh
- Scripps researchers capture images of antibodies working together against malaria
- Mumps increase reported in Georgia
- Minnesota: H5N2 avian influenza detected in Kandiyohi County turkey flock
- Acinetobacter baumannii cases investigated at Newark hospital NICU
So, go right ahead and dress up your chickens!