Monthly treatment is an awful idea that will basically help add to the resistance issue of so many drugs.. possibly requiring a sulpha antiboitic to treat future outbreaks instead of the over the counter product still being effective. Also it blocks thiamine.. robbing your birds while you're treating..Coccid lives in the digestive tract. Usually, folks say to watch for changes in behavior then check feces for bright blood. If the above poster is right that many strains don't cause symptoms but can weaken Chickens - monthly CORID treatment in water would be a good idea, especially in wet conditions. I'm going to improve my CORID routine to help reduce that possibility in my girls.
All strains of coccidia will produce some symptom IF out of control.. just not the blood in feces. A wiser choice would be using a monthly substitute that supports the immune system for a boost like poultry nutri drench, poultry Cell, or Poultry Booster.. All of which will also benefit your egg nutrition that your family is eating.
I live in the Pacific Northwest where some years we get 80+ inched of rain.. and not less than 40 inches in a dry year. Plus being on the coast, it's foggy when it isn't raining. Wetness in and of itself is NOT an issue for coccidia and soil type plus temperature may have impact.. round worms and others may be a larger issue than coccidia.. get fecal floats and don't treat what you don't have an excess of.. or over use what few drugs we have that still work.
Waste removal, stock density, good nutrition, etc.. it all adds up.
Someone told you wrong. Coccidia are a protazoa that live in the digestive tract.. and a fecal float to detect the microscopic oocysts is one of the best ways to detect your load count.As for coccidiosis - I will have to check in the lab if they are able to identify it in the poops. Someone told me coccidiosis is a parasite living in the blood, so maybe then it won't show in the poops..?
I hadn't realized that was the reason for not eating. Yes 100% I think it could be the same issue.He was not eating/drinking because he was blind as both of his eyes were full of that white pus which I subsequently removed. Right now he keeps one eye shut, no more white pus, the other eye is ok. Don't you think eyes could be a result of the same respiratory issue which is causing the breathing/snoring sound?
I'm glad you understand the difference between bacterial and viral and how they're treated respectively.
IIRC.. on another thread you had a bird that was itchy test positive for E Coli. The following link indicates that E Coli can be heavily involved as a secondary bacterial infection source.. starting around #5 with Pneumonitis infection is where it starts getting relevant to your situation..
http://www.flockandherd.net.au/other/reader/respiratory-disease-small-poulty-flocks.html
Considerations taken from the link..
- Bacterial - Coryza, Mycoplasma gallisepticum, Pasteurella multocida, E coli, Strep, Chlamydiosis, Ornithobacterium rhinotracheale.
- Viral -ILT, IBV, AIV, NDV, F pox, Pneumovirus, Mareks disease, Leucosis
- Fungal -Aspergillosis
- Parasitic - Syngamus, trichomoniasis, Oxyspirura, flukes (ducks).
- Physical- Ammonia, lime
- Nutritional - Vit A
- Developmental abnormalities (eg heart, lungs, lymphatics)

Another read about respiratory possibilities and descriptions..
http://www.veterinaryworld.org/2008/July/Common Respiratory Diseases of Poultry.pdf
