I've noticed a couple of my chickens are starting to sneeze and make a gurgling noise. I've looked for some antibiotics, but all have a warning that they aren't intended for use with chickens that produce eggs for human consumption. Are these still safe to use, if I don't collect eggs while the chickens are on them and also several days after I stop administering the medicine? I've also looked a vitamin/mineral/electrolyte mixes. I'm just not sure which route to take...