When does Parvovirus Infection occur? Most infections occur in spring, summer and autumn, with only occasional outbreaks occurring in mild winters. Rain can bring the virus out of the soil and when combined with fly activity, may be the cause of an outbreak.
Once a dog has parvo he deposits the virus into the ground when he defecates. Once in the ground it can live for years. When we experience heavy rain or flooding (like we did this year) the virus surfaces and we see a resurgence of infected dogs who then begin to spread the disease to other unprotected dogs.
Parvo is an environmental pathogen transferred by a fecal-oral cycle that is so infectious that even after parvo-infected dog poop is washed away by rain or snow, the virus can remain in the soil, local veterinarians explained.
Parvovirus is found in any environment (lawns, homes, kennels, dog parks, etc.) and comes from infected dogs that excrete the virus in their vomit or feces. Puppies are more likely to get parvo because they are more likely investigate everything on the ground.
Your dog can contract parvo in several ways: Eating, sniffing or licking the feces of an infected dog. Drinking from contaminated water bowls. Coming in contact with contaminated leashes or collars, or the clothing, shoes or hands of people who have handled infected dogs.
Other common sources of contamination are leashes, bowls, toys, and bedding. On average, the peak of parvovirus season is during the summer and fall months. If you have a young puppy or unvaccinated dog you must contact your vet immediately if they start exhibiting parvovirus symptoms.
Extremely resilient, parvovirus can survive in the environment for up to nine years, including the ground and soil. It can also withstand most household cleaning products (bleach is an exception), heat, cold and humidity, all of which makes the spread of the virus is hard to control.
Now, for most dog owners in Australia, parvovirus is a disease that is part of their pet's regular vaccination regime. Since its emergence, parvovirus remains a leading cause of enteritis (small intestine inflammation) in dogs, despite effective vaccines.
If possible, flush the yard with water and allow to dry. Then apply a disinfectant that is effective with organic material, such as AHP or potassium peroxymonosulfate. These can be used with a pesticide sprayer or hose-end sprayer at the proper dilution to saturate the outside area.
Certain breeds and types of dogs appear to have a higher risk of parvovirus infection or show more severe illness once infected. These include Rottweilers, Doberman Pinschers, Labrador Retrievers, German Shepherds, Bull Terrier breeds, and Alaskan sled dogs.
Parvo is a preventable disease, but even vaccinated dogs are not 100% protected from the virus. Vaccines for the parvovirus are recommended for all puppies and are usually given in a series of three shots when the pup is between 6-to-8 weeks old, again at 10-to-12 weeks, and at 14-to-16 weeks.
Initial signs that your dog may have contracted parvo are running a fever, lethargy, lack of appetite, and anorexia. These initial signs may progress and can result in vomiting and diarrhea within two days after showing their first symptom.
There is evidence suggesting that CPV loses some of its ability to infect an animal after one month in an indoor environment. Outside, you cannot (and should not) bleach your lawn, but rain or watering can dilute the concentration of the virus over time.
Young puppies are very susceptible to infection, particularly because the natural immunity provided in their mothers' milk may wear off before the puppies' own immune systems are mature enough to fight off infection. If a puppy is exposed to canine parvovirus during this gap in protection, it may become ill.
Parvo virus causes severe life threatening diarrhea, often the diarrhea has blood in it. Once a puppy has symptoms of parvo, if left untreated they can die within 48 - 72 hours. It can be simply diagnosed and survival is possible if treated soon enough. If left untreated the mortality rate is as high as 91%.
Puppies are at the greatest risk for parvo between the ages of 6 weeks to 6 months. Puppies can receive their parvo vaccinations at 6, 8 and 12 weeks of age. They must receive a full series of vaccinations to ensure complete immunity. Puppies require a parvo booster vaccine between 14 and 16 weeks of age.
Parvo can be found in almost any environment. It is transmitted when a susceptible dog comes in contact with the virus. This includes contact with the feces of an infected dog, or objects that contain the virus (shoes, clothes, bedding, bowls, grass, carpets, floors, etc).
Parvo may affect dogs of all ages, but is most common in unvaccinated dogs less than one year of age. Young puppies less than five months of age are usually the most severely affected, and the most difficult to treat. Any unvaccinated puppy that shows the symptoms of vomiting or diarrhea should be tested for CPV.
Rain can bring the virus out of the soil and when combined with fly activity, may be the cause of an outbreak. The incubation period for the virus is 4-7 days from the time the dog is first exposed.
Washing hands thoroughly with soap and water will remove the virus. Specific disinfectants need to be used to remove parvovirus from the environment, including toys, clothing and cages. See the Resources section below for a list of disinfectants effective against parvovirus – note it is a “nonenveloped virus.”
But there are very real dangers associated with vaccination and over-vaccination. Not to mention, vaccination doesn't always result in the outcome we are looking for. In fact, data from the Virbac Disease Watchdog shows that 28% of vaccinated puppies and 11% of vaccinated adults still get parvo.
The best household cleaner to use to kill parvovirus is bleach (1 part bleach to 30 parts water). It should be used on hard surfaces including tiles, concrete, paving bottoms of shoes etc – leave the bleach on the surface at least 10-15 minutes. Anything that can be washed in bleach should be.
Even if your veterinarian does everything right, there is still a chance that your puppy won't survive parvo. The near-death signs of parvo include severe lethargy, continuous bloody diarrhea, anorexia, and bloody vomiting. You may not want to admit it to yourself, but this is the point of no return.
The virus can live on contaminated surfaces or clothing for up to 5-6 months. Parvovirus becomes widespread throughout the body in 3-4 days.