Absolutely, wet conditions can make it much worse! That’s how and where the ooycst (the cocci bacteria) thrive in wet, warm, humid conditions. It’s really a very common illness. Sand is a good absorber, and you can easily scoop out the wet sand. But I would def suggest a solid floor, with bedding over it. I bought a new batch of chicks that brought Cocci with them, boy that was not fun. The dosage for liquid Corid is 2tsp per gallon of water. You can also give the sick bird a small drop a couple
Times a day if it isn’t drinking much on its own. Nutri Drench will help with overall wellness. White Vinegar is a good thing to help sanitize your coop as well. Tho it’s good for these older birds to get a bit of exposure to for immunities. If/when this bird pulls through it will be immune to that strain. Keep an eye on everyone’s poo. Any blood or foam is a sure sign. But also the hunkering down like it’s cold, dropping wing, and an “unkempt” dirty look, lethargy, sometimes gaping for breath, are all signs too. You CAN beat this as long as quick action is taken!