Flock health

Backyard Flock Biosecurity: Defend the Flock Checklist, Bird Flu Signs and Who to Call

Field guide · Updated October 14, 2026 · about 6 min read

Biosecurity means keeping germs away from your birds. Against highly pathogenic avian influenza (HPAI) it is the main protection a flock has: USDA APHIS says there is no treatment and that HPAI can wipe out entire flocks within days. This page turns USDA's Defend the Flock guidance and extension advice into backyard checklists, with the warning signs and the numbers to call.

Sick or dying birds? Report them to your State veterinarian or to USDA toll-free at 1-866-536-7593 (USDA APHIS). The U.S. Animal Health Association keeps a "find my state veterinarian" directory.

How disease reaches a backyard flock

• Wild birds. The CDC says backyard flocks can catch avian influenza from wild birds that carry it, and APHIS notes that wild birds can carry it without looking sick. Penn State Extension calls waterfowl the primary reservoir.
• People and things. APHIS lists direct bird-to-bird contact and contaminated manure, egg flats, crates, equipment, clothing, shoes and hands.

APHIS says avian influenza A viruses rarely infect people; the CDC adds that owners exposed to their own infected, sick birds are at higher risk.

USDA's four Defend the Flock steps

Biosecurity checklist

Every day

• Wash your hands before and after touching birds. APHIS prefers soap and water, with hand sanitizer as a backup. California's CDFA specifies at least 70% alcohol, and only when hands are not visibly dirty.
• Wear coop-only clothes and shoes; CDFA keeps coveralls and rubber boots by the coop.
• Give clean feed and water daily (CDFA).
• Watch the flock for the warning signs listed below (APHIS: learn the signs and monitor flock health).
• Do chores for healthy birds first and new or sick birds last (CDFA, Penn State).
• Keep poultry out of the house, especially where food is prepared or stored (CDC).

Every week or month

• CDFA: clean and disinfect coops at least once a week; remove droppings and change bedding at least two to three times a week.
• Look for rodent signs; use covered bait stations or traps and close holes (Penn State).
• Check for parasites monthly (Penn State). See mite treatment options.

Visitors and equipment

• Only people who care for the birds should touch them (APHIS). Penn State's May 2026 alert suggests a visitor log and asks visitors to avoid other birds for 72 hours beforehand.
• Don't share tools or equipment with other poultry owners. Disinfect anything borrowed before it comes onto your property (Penn State, UGA).
• Don't visit other poultry facilities or go to your birds after hunting or other contact with wild-bird areas (Penn State).

New birds and birds back from shows

During quarantine, watch for illness and wear separate clothing for the quarantine pen (CDFA). The sources differ on length; 30 days satisfies all of them.

Cleaning and disinfecting the coop

APHIS's clean routine, in order:

1. Put on poultry-only clothing and boots, move the birds to a separate area and leave the coop empty.
2. Dry clean: brush, scrape and shovel out manure, feathers and debris. "Disinfectant won't work through organic matter or caked-on dirt."
3. Wet clean: scrub all surfaces with water and detergent, top to bottom and back to front, then rinse.
4. Disinfect with an EPA-registered product effective against avian influenza, following the label. CDFA stresses the label's contact time.
5. Dry completely before birds return; fans or open doors and windows help.
6. Discard disposable gear or clean reusable clothes and boots, then wash your hands.

When replacing a whole flock, Penn State advises "all in, all out": remove every bird and disinfect the coop before new birds arrive. For drinkers, see keeping a nipple waterer clean.

Keep wild birds and wildlife out

• Where possible, house birds in a coop with four walls and a roof. Outdoors, use a contained area covered with netting (Penn State, 2026).
• Repair holes in buildings and damaged screens (APHIS).
• Don't feed wildlife. Store feed in sealed containers, clean up spills, remove fallen fruit and keep compost and trash covered (APHIS, Penn State).
• Never use untreated surface water to water poultry or clean their housing. Fence natural ponds off from the poultry area, and fill or grade spots where water stands more than 48 hours after heavy rain (APHIS).

Warning signs of avian influenza

APHIS lists these signs and says they could point to avian influenza or another poultry disease. Report sudden or significant changes right away.

The CDC's list adds ruffled feathers and discolored or irregular eggs. The yearly molt also cuts laying; see molting for how to tell the two apart.

Who to call, step by step

1. Isolate sick birds (APHIS, CDFA).
2. Report sick or dying birds to your State veterinarian, to USDA at 1-866-536-7593, or to your APHIS Area Veterinarian in Charge (APHIS). The AVMA says to call your veterinarian before bringing a bird in.
3. No poultry vet? The CDC suggests a veterinarian or local extension agent with poultry experience, who can refer you to one.
4. Stop movement. Penn State: put your premises under voluntary quarantine from all visitors, and don't buy, sell, trade or move birds.
5. Keep dead birds for testing. Double-bag and refrigerate them, do not freeze them, and contact a veterinary diagnostic lab (Penn State). CDFA says to refrigerate for no more than 3 days before shipping.
6. Protect yourself. The CDC says not to touch sick or dead birds, droppings or litter without goggles, disposable gloves, boots or boot covers, an N95 respirator if available (otherwise a well-fitting facemask), coveralls and a head cover. After exposure to potentially infected birds, watch for symptoms for 10 days and contact your local or state health department with concerns.

Current detections are posted on APHIS's H5N1 HPAI page. HenClass does not give veterinary advice. For sick birds, follow your veterinarian and your state animal health officials.