A disease report in your area changes the risk picture even when your own hens look perfectly well. Biosecurity in that moment means breaking the routes by which infection travels: on footwear, on shared tools, in contaminated feed or water, and through contact with wild birds or other flocks. None of the steps below involves treatment or medication; they are husbandry barriers, applied consistently for as long as official guidance for your area says the risk remains.
Separate your flock from wild birds and other poultry
Keep your birds in a covered run or housed while the alert lasts, so direct contact with wild birds and their droppings is cut off. Move feeders and drinkers under cover, store feed in sealed containers that wild birds and rodents cannot reach, and clear spilled grain promptly, since spilled feed draws visitors to exactly the ground your hens use. Netting or a solid roof over the run also keeps droppings from perching wild birds out of the pen. Stop taking birds to shows, swaps or shared grazing, decline offers of new birds for now, and avoid visiting other flocks; if you must visit one, treat your clothing and footwear as contaminated when you return home.
Quarantine for new and returning birds
Any bird that joins or rejoins the flock during a risky period should live apart first, in separate housing with its own feeder, drinker and tools, positioned so drainage and air flow do not carry material from the quarantine pen toward the main flock. Tend the resident birds first and the quarantined birds last, washing hands between groups. Watch the separated birds closely each day for appetite, posture, breathing and droppings, and agree the length of separation and the signs that would end it early with a poultry vet before the bird arrives rather than improvising afterwards. A bird returning from a show, a loan or veterinary care counts as returning stock, not as a bird that never left.
Footwear, equipment and visitor discipline
Set a single entry point to the pen and keep dedicated boots there that go nowhere else, cleaning them on arrival and departure so mud and droppings are not carried in either direction. Keep pen tools, buckets and wheelbarrows for the flock only, and clean equipment before any disinfecting step, following the label directions on whatever product you use, since dirt undermines the process. Ask visitors to stay out of the run during an alert, signpost the rule for delivery drivers and neighbours, and keep a simple note of who entered the yard and when. Children who keep poultry at school or friends who help with holiday care need the same briefing as adults, delivered kindly and clearly.
Watching the flock and reporting through official routes
Walk the flock slowly at least once a day, looking for hens that hang back, eat less, sit fluffed, breathe with effort, lay oddly or produce unusual droppings, and note deaths with dates rather than relying on recollection. If signs worry you, contact your vet or the official animal-health reporting route for your area promptly and follow the instructions you are given about movements and sampling. Keep your log of observations, purchases, movements and visitors current as events unfold, since officials reconstruct timelines from exactly those details. That dated flock log sits neatly in Pet Passport on KinsLe, ready to hand over whenever an officer or clinician asks what happened and when.