Hi everyone, I posted a while back about a lucky ILT outbreak... fast forward now, I'm doing my first batch of chickens. Pen was disinfected well with Virkon, and I try my best to maintain biosecurity regards fomites. The broilers are now 3 weeks 5 days and have recently started sneezing. I look at them carefully every day, and up to today could not see any other symptom (no gasping, no crusty eyes, no discharges). They are alert and happy, but today I did find two instances of bloody something...

or mucus. They look ok, but I am on high alert.
They're coming out of chick crumbs onto mash, and I change their water twice a day and give electrolytes/vitamins. Thougts? Should I vaccinate my broilers for ILT? If so, where do I get the vaccine - near Ottawa.