Wash your hands after filling or cleaning your feeders. Don't allow large amounts of seed to become wet on platform feeders. Instead, when it's wet outside, feed from covered feeders that will keep seed dry, or put out only a handful of seed at a time on platforms. When you put food out in the winter, other animals will also come looking for food. Watch out for squirrels and raccoons, they can eat all of the seed up in a matter of hours and possibly destroy the feeder to get at the food inside.
Cages also work for some type of hanging feeders.
Birds of prey, like hawks, can also dive at your feeders or wait in the shadows to make a meal out of the birds eating in your yard. You can help protect the birds at your feeder by placing it in an area that has trees, brush piles, and bushes so the birds can take cover if they are being watched. Baffles over feeders can also help as well as wire cages around the feeder to keep birds protected inside. Cats on the loose are also a problem for birds at feeders. They wait in the shadows like hawks and pounce on feeding birds.