Since manure is a breeding ground for flies, another infestation could occur in a few months.
Salmonella is another concern associated with poultry feces. According to the Centers for Disease Control and Prevention:
"Live poultry may have Salmonella germs in their droppings and on their bodies (including feathers, feet, and beaks) even when they appear healthy and clean. The germs can also get on cages, coops, hay, plants, and soil in the area where the birds live and roam. Additionally, the germs can be found on the hands, shoes, and clothing of those who handle the birds or work or play where they live and roam. Raising chickens in your backyard can be fun and rewarding, but please be careful doing so.
Salmonella can make people sick with diarrhea and fever, often with vomiting and abdominal cramps. Sometimes, people can become so sick from a Salmonella infection that they have to go to the hospital."