I just treated my girls with a 2ND round of Corid for the same reason & now that they've finished their 2nd course of treatment, 2 OTHER girls are starting with blood in their droppings!! I am thinking that they need an antibiotic so I will have to do some research on this site to see which one, dosages & of course buy them some juice...because I know that it's not hoing to taste good & they are NOT gonna to want to drink their meds.