Porcine Epidemic Diarrhea in Pigs: PED Symptoms, Mortality, and Biosecurity
- See your vet immediately if a pig has sudden watery diarrhea, vomiting, weakness, or rapid dehydration, especially in nursing piglets.
- Porcine epidemic diarrhea (PED) is a highly contagious coronavirus infection of pigs that spreads mainly through infected feces, contaminated boots, tools, trailers, feed-contact surfaces, and pig movement.
- Mortality is highest in neonatal piglets. In naive herds, piglets infected in the first week of life can die within 3 to 4 days, and losses may exceed 60% to 100% depending on age, immunity, and strain.
- There is no specific antiviral treatment. Care focuses on fluids, warmth, nursing support, sanitation, and strict herd biosecurity directed by your vet.
- Typical U.S. veterinary cost range for an outbreak workup and first-line herd response is about $250-$1,500 for farm call, exam, PCR testing, and initial supportive planning, with total outbreak costs rising much higher if many piglets need intensive support.
What Is Porcine Epidemic Diarrhea in Pigs?
Porcine epidemic diarrhea, or PED, is a contagious intestinal disease caused by porcine epidemic diarrhea virus (PEDV), a coronavirus that affects pigs. It causes sudden vomiting and profuse diarrhea, with the most severe disease seen in suckling piglets. Older pigs often survive, but they can still become sick and shed virus into the environment.
PED spreads fast through a group because the virus is shed in feces and moves easily on contaminated clothing, boots, hands, equipment, trailers, and other farm surfaces. In a herd with little or no prior immunity, nearly all pigs may become infected over a short period. That is why early recognition and immediate biosecurity matter so much.
For pet pigs and small backyard groups, PED can still be serious. Young piglets are at the highest risk for life-threatening dehydration and death. Adult pigs usually have lower mortality, but they may develop diarrhea, reduced appetite, and weakness that still require prompt veterinary guidance.
Symptoms of Porcine Epidemic Diarrhea in Pigs
- Profuse watery diarrhea, often sudden in onset and severe in nursing piglets
- Vomiting, especially early in the course of infection
- Rapid dehydration with sunken eyes, dry mouth, and weakness
- Lethargy, piling, chilling, or failure to nurse in piglets
- Reduced appetite or anorexia in older pigs
- Weight loss and poor body condition if illness continues
- Higher pre-weaning death loss, especially in piglets under 7 days old
- Milder diarrhea and lower death rates in older growing pigs and adults
See your vet immediately if a piglet has watery diarrhea, vomiting, weakness, or stops nursing. PED can cause dangerous dehydration very quickly, sometimes within hours. The youngest piglets are the most fragile.
Adult pigs may recover with supportive care, but they can still spread infection. Any sudden diarrhea outbreak in multiple pigs should be treated as urgent until your vet helps rule out PED, transmissible gastroenteritis, deltacoronavirus, coccidiosis, salmonellosis, or other serious causes.
What Causes Porcine Epidemic Diarrhea in Pigs?
PED is caused by porcine epidemic diarrhea virus (PEDV), an enteric coronavirus that infects the lining of the small intestine. The virus damages intestinal villi, which reduces the pig's ability to absorb fluids and nutrients. That damage leads to diarrhea, dehydration, electrolyte loss, and weakness.
The main route of spread is fecal-oral transmission. Pigs become infected when they contact manure or contaminated materials carrying the virus. Common sources include boots, coveralls, feeders, waterers, sorting boards, transport trailers, tires, loading ramps, and hands. Movement of infected pigs or contaminated vehicles is a major biosecurity concern.
Age and immunity strongly affect outcome. Newborn piglets have the highest mortality because they dehydrate quickly and have limited reserves. Herds with no recent exposure or limited maternal immunity often see the most severe losses. Even when adults survive, they can amplify spread to vulnerable piglets.
How Is Porcine Epidemic Diarrhea in Pigs Diagnosed?
Your vet usually starts with the history, age group affected, speed of spread, and stool appearance. PED often causes a rapid outbreak of vomiting and watery diarrhea across multiple pigs, with the worst disease in neonatal piglets. Still, signs alone are not enough to confirm it.
Diagnosis is typically confirmed with PCR testing on fresh feces, fecal swabs, intestinal contents, oral fluids, environmental swabs, or intestinal tissue from acutely affected pigs. Samples collected early in the outbreak are often the most useful. In some cases, your vet may also submit formalin-fixed intestine for histopathology or immunohistochemistry.
Because several swine diseases can look similar, your vet may recommend testing for transmissible gastroenteritis virus (TGEV), porcine deltacoronavirus (PDCoV), coccidia, rotavirus, or bacterial enteritis at the same time. That broader approach helps guide isolation, sanitation, and herd management decisions.
Treatment Options for Porcine Epidemic Diarrhea in Pigs
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Budget-Conscious Care
- Farm call or teleconsult guidance with your vet
- PCR testing on selected fecal or intestinal samples
- Oral electrolyte support where practical
- Supplemental heat, dry bedding, and frequent monitoring
- Strict isolation of sick pigs and manure control
- Basic cleaning and disinfection of tools, boots, and traffic areas
Recommended Standard Treatment
- Full veterinary herd assessment and outbreak plan
- PCR confirmation plus differential testing as needed
- Structured oral and injectable fluid support directed by your vet
- Nursing support for weak piglets, warming, and frequent reassessment
- Enhanced sanitation protocols for pens, feeders, and handling equipment
- Biosecurity plan for people, pig flow, and vehicle entry
Advanced / Critical Care
- Intensive veterinary oversight for severe herd outbreaks
- Expanded diagnostics and necropsy submission when needed
- Aggressive fluid and supportive protocols for valuable or high-risk animals as directed by your vet
- Dedicated isolation workflow, PPE, and traffic control
- Professional-grade cleaning, disinfection, drying, and transport biosecurity upgrades
- Broader herd recovery planning, monitoring, and follow-up testing
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Porcine Epidemic Diarrhea in Pigs
Bring these questions to your vet appointment to get the most out of your visit.
- Based on my pig's age and symptoms, how likely is PED compared with other causes of diarrhea?
- Which samples should we submit for PCR, and how soon do they need to be collected?
- What fluid and electrolyte plan makes sense for these pigs at home or on the farm?
- Which pigs need immediate isolation, and how should we handle chores to reduce spread?
- What cleaning and disinfection products are appropriate for this setup, and what contact time matters most?
- How long should we consider recovered pigs potentially infectious for biosecurity planning?
- Should we test for TGEV, PDCoV, coccidia, or bacterial causes at the same time?
- What realistic monitoring signs tell us a piglet is improving versus declining?
How to Prevent Porcine Epidemic Diarrhea in Pigs
Preventing PED starts with biosecurity every day, not only during an outbreak. The virus spreads efficiently in manure and on contaminated surfaces, so routine control of boots, clothing, tools, feeders, waterers, and transport equipment is essential. New pigs should be introduced cautiously and only with a plan from your vet.
Limit unnecessary visitors and keep a clear separation between pig areas and outside traffic. Dedicated boots and coveralls, hand hygiene, and chore order from youngest or healthiest pigs to sick pigs can reduce spread. Transport vehicles and trailers are especially important. Organic debris must be removed before disinfection, because disinfectants do not work well through manure and dirt.
Cleaning, disinfection, and complete drying are key parts of PED control. Pens, ramps, boards, buckets, and trailers should be thoroughly cleaned, then disinfected according to label directions, including contact time. Your vet can help tailor a practical plan for your home, small farm, or breeding setup.
If you suspect PED, isolate affected pigs right away and contact your vet. Fast action may not stop every case, but it can reduce exposure pressure, protect unaffected pigs, and improve overall outbreak control.