Feline panleukopenia virus is the reason a cattery cleaning routine is not housekeeping. It survives 6 to 12 months on a dry surface, shrugs off most household disinfectants, and travels in on a shoe, a show cage, or a bag of litter. One contaminated carrier can seed an entire nursery before anyone sees a sick kitten.
Why FPV breaks the normal cleaning logic
FPV is a non-enveloped parvovirus, which means it has no lipid coat for alcohol or quaternary ammonium to dissolve. It resists drying, heat up to 60 degrees Celsius for short periods, and most of the pH range you can safely put on a floor. In a cattery it also arrives in volume: a kitten with FPV sheds virus in every stool and vomit for days, and a single gram of feces can carry enough to infect a room.
Mortality is brutal in the group a cattery cares about most: kittens under 8 weeks can die in 60 to 90 percent of untreated cases, and death can come within 12 to 24 hours of the first sign. That is why the protocol is built around surfaces, not around symptoms. By the time you see a sick kitten, the room is already contaminated.
Bleach at 1:32 and the 10-minute clock
Household bleach at 5.25 percent sodium hypochlorite diluted 1:32 gives roughly 5,000 ppm available chlorine, and that is the concentration the veterinary literature treats as effective against FPV. The math: 125 mL of bleach into 4 liters of water, mixed fresh, used within 24 hours, because chlorine off-gasses and the bottle stops being a disinfectant without changing appearance.
Three conditions decide whether it works. First, preclean. Organic matter eats chlorine on contact, so a surface with visible feces or food residue must be washed with detergent and rinsed before the bleach goes on. Second, wet contact time. The surface has to stay visibly wet for 10 minutes; a quick wipe and a dry rag is a rinse, not a disinfection. Third, compatibility. Bleach corrodes stainless steel and ruins some plastics and most fabrics, so porous items get discarded rather than disinfected.
For heavily soiled areas, a 1:10 dilution is used for the first pass, then a 1:32 pass after rinsing. Never mix bleach with a quaternary ammonium product in the same bucket; the reaction produces chlorine gas.
Accelerated hydrogen peroxide versus quaternary ammonium
| Product | Dilution | Wet contact | Against FPV | Notes |
|---|---|---|---|---|
| Sodium hypochlorite | 1:32 fresh | 10 minutes | Effective when precleaned | Corrosive, fumes, ruins fabric |
| Accelerated hydrogen peroxide 0.5 to 1 percent | Ready to use | 1 to 5 minutes | Effective per label claims | Low residue, safe on most hard surfaces |
| Quaternary ammonium | 1:256 typical | 10 minutes | Weak against non-enveloped virus | Good on grease, not a parvo product |
| Steam or heat | Not applicable | 60 degrees Celsius and up | Effective on porous items | Use for bedding, not for plastic |
Accelerated hydrogen peroxide is the practical alternative in a room with metal cages and rubber mats. It costs 3 to 5 times what bleach costs per liter of working solution, it does not need a rinse on food surfaces, and staff will actually use it because it does not burn their throat. Quaternary ammonium belongs on grease and grime, not on a parvo protocol, and a cattery that relies on it is relying on a product that has never been the answer.
The rotation cycle
Rotate the primary disinfectant every 4 to 6 weeks, not because the virus develops resistance, which it does not, but because residue films build up and mask failures. A room cleaned with the same product for 6 months can look clean and test positive, because the film protects the surface underneath from the wet contact that was supposed to kill the virus.
A workable rotation: accelerated hydrogen peroxide for 4 weeks, then bleach at 1:32 for 2 weeks, with a full strip-out and rinse at each switch. Change mop heads weekly, and keep separate mops for the nursery and the isolation room. A mop bucket is a virus distribution system with a handle.
Traffic control is the real weak point
- One pair of shoes per room, or disposable boot covers changed at the door.
- Footbath at every doorway, refreshed daily, because a dirty footbath is worse than none.
- 21 days of quarantine for any cat entering the cattery, 7 days after a show.
- Kitten room cleaned last, isolation room cleaned first, and never the reverse.
- No shared brushes, towels, or scales between the nursery and the isolation room.
- Hands washed between litters, not between rooms.
After a confirmed case
Remove every porous item: bedding, cardboard scratchers, wooden shelves, fabric toys. They cannot be reliably disinfected and are cheaper to replace than to gamble on. Hard surfaces get a detergent wash, a rinse, a 1:32 bleach pass with 10 minutes wet contact, and a second rinse. The room then stays empty for 21 days, which covers the incubation period with margin.
Heat works where chemicals cannot reach: bedding and towels at 60 degrees Celsius or above in a machine wash, and stainless steel bowls through an autoclave at 121 degrees Celsius and 15 psi if you have access to one. A veterinary practice will usually run a load for a local breeder.
Before restocking, swab the room and run a PCR test on the swabs. A negative swab is the only evidence that matters, and it costs less than one litter of kittens. The heat cycle and mating timing guide explains why a queen exposed to FPV should skip a cycle, and stud cat management covers the isolation side for a male that travels. Breed-specific susceptibility notes sit under cat breeds.
- Buy a kitchen scale, a 5 litre jug, and a timer, and keep them in the cleaning room.
- Write the 1:32 recipe on the wall: 125 mL bleach to 4 liters of water, fresh daily.
- Preclean, rinse, then soak the surface wet for 10 full minutes.
- Rotate disinfectants every 4 to 6 weeks with a strip-out in between.
- Quarantine every incoming cat for 21 days, including your own show cat.
Frequently asked
Does bleach kill parvovirus on floors?
Yes, at the right concentration and with the right contact time. Household bleach at 5.25 percent sodium hypochlorite diluted 1:32, which is 125 mL in 4 liters of water, gives about 5,000 ppm available chlorine. The surface must be precleaned of organic matter, then stay visibly wet for 10 full minutes. Mixed solution loses strength within 24 hours, so it is made fresh each day.
Why rotate disinfectants if the virus cannot become resistant?
Because the failure mode is residue, not resistance. Repeated use of one product leaves a film that shields the surface underneath from the wet contact that was supposed to inactivate the virus, so a room can look clean and still test positive on a PCR swab. Rotating every 4 to 6 weeks with a full strip-out and rinse between products breaks that film and exposes the surface again.
How long must a room stay empty after a panleukopenia case?
Twenty-one days after the final disinfection, which covers the incubation period with margin. Before that, every porous item including bedding, cardboard scratchers, and fabric toys should be discarded rather than disinfected, because they cannot be reliably cleaned. Hard surfaces get a detergent wash, a rinse, a 1:32 bleach pass with 10 minutes wet contact, and a second rinse.