Holly Faulkner, Project Assistant says:

Hi Laura, Mycoplasmal convunctivitis has only been found in members of the finch family so far, but that doesn’t mean your scrub-jay isn’t sick with something else. Regardless of the disease, we recommend anytime you see a sick bird, that it’s best to take your feeders down and clean them. Cleaning them regularly (every 1-2 weeks) is the best way to prevent disease, even when you see no sick birds. You can learn more about bird diseases and how best to clean your feeders here. Please also note that it is against federal law to handle to treat wild birds without a federal permit. If you’re particularly worried about an individual, the best thing to do is to call a local wildlife rehabilitator before taking action. If you’re not sure who that is, your state’s wildlife office should have a list of rehabilitators that are federally certified.