Can feeders or bird baths make birds sick?

Bringing birds together like we do at feeders and bird baths is unnatural, and increases the chances for them to spread disease, or for waste to accumulate and breed diseases. By spreading out feeders and providing several sources of water in different parts of the yard, you not only decrease the concentration of disease and wastes, but the reduced competition is less stressful on the birds.  It is also critically important to clean feeders and bird baths regularly to not only remove old seed and bird waste, but to also disinfect them with a weak bleach solution.