Internal parasites and one viral disease account for most of the losses smallholders see in goats and sheep. Neither gets the attention it deserves until an animal is already down. Here’s what actually threatens goat and sheep health in Africa, how to catch it early, and why the deworming drug you’ve always used might already be failing you.
Start with the breed and market timing guide if you’re just setting up.
Haemonchus contortus: the parasite that kills more animals than any disease
Haemonchus contortus, often called the barber’s pole worm, is a blood-feeding stomach parasite and the single biggest health threat to goats and sheep across the continent. Studies across East Africa report prevalence rates that are hard to overstate: one Ethiopian study found infection in over 90% of sheep and goats sampled, and a South African study using the FAMACHA scoring method found 68% prevalence in sheep.
- What it does: The worm feeds on blood in the stomach lining, causing anaemia, weakness, bottle jaw (fluid swelling under the chin), and death in severe cases, especially in young or already-stressed animals.
- Why it’s hard to spot early: Unlike diarrhoea-causing worms, Haemonchus doesn’t always show obvious digestive signs. The first clue is often just a pale animal that’s losing condition.
- Seasonal risk: Infection risk tracks rainfall and pasture moisture, since the worm’s eggs and larvae need a damp environment to develop and survive on pasture.
FAMACHA scoring: catching anaemia before it costs you an animal
FAMACHA is a simple, low-cost field method that lets you check an animal’s risk without a lab. You check the colour of the inner eyelid membrane and compare it against a reference chart running from red (healthy) to white (severely anaemic).
- Why it works: Research has found a strong correlation between FAMACHA score and actual worm egg counts, with severely anaemic animals showing roughly 15 times higher egg counts than non-anaemic ones in the same flock.
- Why it matters for your drug budget: FAMACHA lets you practice targeted selective treatment; dosing only the animals that actually need it, rather than deworming the whole flock on a calendar schedule. This saves money and slows the development of drug resistance.
- How to use it: Check eyelid colour regularly, especially during and after the rains when risk peaks, and treat only the animals scoring in the anaemic range on the chart.
Anthelmintic resistance: why your dewormer might already be failing
This is the part most farmers don’t know yet. Haemonchus contortus has developed resistance to every major class of deworming drug in use, and it happened fast; in some cases within a decade of a new drug’s introduction. This isn’t a distant problem. Studies from Uganda found resistance in a meaningful share of goat farms to ivermectin, levamisole, and albendazole alike, and Ethiopian and South African studies report similar patterns.
- What’s driving it: Routine, whole-flock deworming on a fixed schedule, regardless of whether animals actually need treatment, accelerates resistance by killing off susceptible worms and leaving resistant ones to breed.
- What to do instead: Use FAMACHA or another targeted method to treat only animals that need it, rotate drug classes rather than using the same one repeatedly, and leave some untreated animals in the flock (known as refugia) to dilute the resistant worm population.
- Signs your dewormer isn’t working: Animals that don’t improve after treatment, or a flock where deworming seems less effective than it used to be, are both signals worth investigating with your local vet.
PPR (Peste des Petits Ruminants): the viral disease that can wipe out a flock
PPR is a highly contagious viral disease that can kill 70 to 80% of an infected, unvaccinated flock within 10 to 12 days. First identified in Côte d’Ivoire, it’s now endemic across most of the continent, though southern Africa has so far stayed free of it.
- Symptoms: Fever, discharge from the eyes and nose, mouth sores, diarrhoea, coughing, laboured breathing, and abortion. Goats tend to show more severe signs than sheep, though both are susceptible.
- How it spreads: Direct contact between animals, or indirectly through contaminated water, feed, or aerosol transmission in close quarters.
- Vaccination: A live attenuated vaccine gives protection lasting at least three years, and a heat-stable version has been developed specifically for hot African climates where maintaining a cold chain for vaccines is difficult.
- Treatment: There is no cure once an animal is infected; only supportive care. Vaccination before an outbreak is the only real defence.
Annual PPR vaccination is standard practice across most of the continent for good reason. If you’re not currently vaccinating, this is the single highest-impact health decision available to you.
CCPP (Contagious Caprine Pleuropneumonia): the East African goat killer
CCPP is a severe bacterial lung disease that primarily hits goats and can kill up to 80% of animals in a naive, unvaccinated herd. It causes roughly $507 million in economic losses across endemic areas each year, according to industry estimates.
- Symptoms: Fever, violent coughing, laboured breathing with the neck stretched out, loss of appetite, and abortion. In the fastest-moving cases, an animal can die within one to three days showing minimal warning signs.
- Treatment: Tetracyclines or tylosin can work if given early in the disease course, but treatment doesn’t clear the bacteria completely from a herd.
- Prevention: Vaccination is the most effective control method, though the current vaccine’s protection lasts less than a year, meaning it needs regular boosting in high-risk areas. Avoid mixing your flock with unfamiliar animals, especially at shared grazing or watering points.
- Where it matters most: CCPP shows up across more than 40 countries in Africa, Asia, and the Middle East, but East Africa carries a particularly heavy burden.
Building a basic small ruminant health routine
- Weekly: Check eyelid colour (FAMACHA) on a sample of your flock, especially during and just after the rains.
- Monthly: Check hooves for overgrowth or infection, and body condition for any animal losing weight without an obvious cause.
- Annually: PPR vaccination, plus CCPP vaccination if you’re in an endemic area; talk to your local vet about the right schedule for your region.
- Before kidding or lambing: Vaccinate does and ewes so their young get protection through colostrum.
- Whenever you deworm: Use FAMACHA or another targeted method rather than treating the whole flock automatically, and rotate drug classes to slow resistance.
Key takeaways
- Haemonchus contortus is the leading health threat to goats and sheep across the continent, with infection rates commonly above 80% in some regions.
- FAMACHA scoring lets you treat only the animals that need it, saving money and slowing the resistance that’s already widespread across Africa.
- Anthelmintic resistance is not a future risk; it’s already documented in Uganda, Ethiopia, and South Africa across all major drug classes.
- PPR can kill most of an unvaccinated flock within two weeks; annual vaccination is the highest-impact health decision you can make.
- CCPP hits goats hardest in East Africa; vaccination needs yearly boosting since current protection doesn’t last a full year.
FAQ
What is the biggest health threat to goats and sheep in Africa?
Internal parasites, particularly Haemonchus contortus, cause more losses than any single disease across most of the continent. PPR is the most severe viral threat, capable of killing most of an unvaccinated flock within two weeks of an outbreak.
How do I check for FAMACHA score at home?
Gently pull down the lower eyelid and compare the colour of the inner membrane against a FAMACHA reference chart, available from many veterinary suppliers. Bright red to pink indicates a healthy animal; pale pink to white signals anaemia and a likely need for deworming.
Why do dewormers stop working over time?
Frequent, whole-flock deworming kills susceptible worms while resistant ones survive and reproduce, gradually building a population that no longer responds to the drug. This is already widespread in Haemonchus contortus across parts of Africa, which is why targeted treatment and drug rotation matter more than routine dosing.
Is there a cure for PPR?
No. There is no treatment that cures PPR once an animal is infected; only supportive care is possible. Prevention through annual vaccination is the only reliable defence, and a heat-stable vaccine version now exists specifically for hot African climates.
Which regions in Africa are most at risk for CCPP?
CCPP has been reported across more than 40 countries in Africa, Asia, and the Middle East, with East Africa carrying a particularly heavy disease burden. If you farm goats in this region, ask your local vet about current CCPP vaccination recommendations for your area.
Should I deworm my entire flock on a schedule?
Not anymore, if you can help it. Routine whole-flock deworming accelerates drug resistance. Targeted selective treatment using FAMACHA scoring, where you only treat animals showing signs of anaemia, is now the recommended approach across most of the parasite-resistance research coming out of Africa.
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