Lamb meningitis
Meningitis is an infection of the coverings surrounding the brain and spinal cord. In lambs, it most often occurs in the first weeks of life. Bacteria almost never arrive directly at the brain: they leave from elsewhere. The poorly disinfec...
What is it?
Meningitis is an infection of the coverings surrounding the brain and spinal cord. In lambs, it most often occurs in the first weeks of life. Bacteria almost never arrive directly at the brain: they leave from elsewhere. The poorly disinfected navel is the classic entry point, but an infection of the joints, lung or intestine can also seed the blood, and the blood carries the bacteria to the brain. This explains why Lamb meningitis is almost always the last story of the same story: a lamb that did not receive enough colostrum, born in a dirty place, with an undisinfected navel. It is a cousin of navel infection and joint infection, which often exist in the same animal. The affected lamb changes suddenly: it no longer suckles, becomes stiff, keeps its head thrown back, can no longer see, then convulses. This is a first-rate emergency, where the difference between treatment started the same morning and treatment started the next day makes all the difference.
Key point
Any lamb that becomes stiff, trembling or can no longer see should be examined within the hour. Each hour of delay reduces your chances and increases the risk of permanent after-effects.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
Lamb that suddenly stops suckling and separates from its mother.
General stiffness: rigid neck, tense back, head thrown back in marked shapes, limbs as stiff as wood.
Hypersensitivity to noise and touch: just taking it triggers tremors or a seizure.
Tremors, pedaling movements, convulsions.
Fever at first, often followed by cold as the lamb becomes weak.
Lamb that staggers, turns, tilts its head, pushes against the walls.
Loss of vision: he no longer reacts to the movement of the hand in front of his eyes, bumps into things, can no longer find his mother.
Grinding teeth and signs of pain.
Lamb lying on its side, limbs outstretched, which no longer gets up.
Often, at the same time: large, hot or oozing navel, swollen joints, lameness. These signs are valuable clues to the origin of the infection.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
Various environmental bacteria, notably those which swarm in soiled litter, reach the lamb's blood and then the coverings of the brain.
The most common portals of entry are the navel, the intestine in the first days of life, the joints and the lung.
The factor that makes all this possible is almost always the same: insufficient colostrum or taken too late. Without maternal antibodies, the lamb cannot stop any bacteria.
Lambing in dirty environments, over-density and pens reused without cleaning multiply the quantity of germs to which the lamb is exposed.
Other infectious diseases of sheep can also affect the brain and give rise to similar symptoms: the veterinarian must distinguish them, because the treatments differ.
Insufficient colostrum, too late or of poor quality: always the first factor.
Navel not disinfected or disinfected too late after birth.
Damp and loaded litter, lambing pens reused without cleaning, high density of animals.
Lambs from multiple litters, low weight lambs, lambs from difficult lambings.
Thin or poorly nourished ewes at the end of gestation.
Pre-existing navel or joint infection in the same lamb.
Second half of lambing season.
Transmission
It is not a disease that is transmitted from one lamb to another by contact: each becomes infected from the environment.
But when several lambs are affected, it is a sign that the building is saturated with germs and that the lambing management is in question. We must then act on the entire group, not just on the patient.
The germs in question do not present any particular danger for the breeder under normal working conditions; the usual rules of hand hygiene are sufficient.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian performs a complete nervous examination and looks for the entrance: he feels the navel, examines all the joints, auscultates the lung, takes the temperature.
The presence of an abnormal navel or swollen joints in a lamb showing nervous signs is very suggestive.
A blood test evaluates the infection and general condition.
Additional examinations, including analysis of the fluid surrounding the brain, are possible depending on the means available; they confirm the diagnosis.
The veterinarian rules out other causes of nervous signs in young lambs, which are numerous and similar: enterotoxemia, tetanus, deficiencies, poisoning, malformation, lack of oxygen at birth, deep hypothermia and hypoglycemia of the newborn. Some can be corrected in a few minutes, hence the importance of not concluding alone.
Examining a dead lamb is useful when several cases occur: it guides prevention for the rest of the campaign.
Treatment
It is an emergency: the prognosis directly depends on the time between the first signs and the start of treatment.
The veterinarian prescribes an antibiotic capable of reaching the brain, which is not the case for everyone, and often an anti-inflammatory to limit the damage linked to inflammation. The choice of molecules, the route and the duration are entirely his decision: an unsuitable antibiotic does not cross the brain barrier and is of no use, even if it is effective elsewhere.
Supportive care is essential: lamb in a quiet place, protected from light and noise, on thick bedding, warmed if it is cold, fed by a suitable method if it is no longer suckling. The veterinarian tells you how to feed a lamb that can no longer swallow on its own.
Seizures may require specific treatment, upon prescription.
Treatment must be continued for a fairly long time, including after improvement: stopping as soon as the lamb gets up exposes itself to a rapid and often fatal relapse.
At the same time, the front door must be treated: an infected navel or affected joints require their own treatment.
No improvised treatment with the bottom of a bottle from a previous campaign: the molecule, the route and the duration decide the fate of the lamb.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Secure colostrum intake: each lamb must drink early, in sufficient quantity, and this must be checked rather than assumed.
Disinfect the navel of all lambs at birth, with the product and method indicated by the veterinarian, and repeat it if necessary. It is the gesture that cuts the main entrance door.
Clean, disinfect and re-mulch the lambing pens between two ewes; never leave litter box soggy.
Provide enough individual pens to avoid lambing in the corridor.
Feed ewes correctly at the end of pregnancy.
Treat any navel infection or swollen joint in a lamb immediately: this is where meningitis is prevented.
Be extra vigilant in the second part of the lambing season.
Isolate sick lambs so you can monitor and care for them properly.
Vaccination
No vaccine directly targets this infection.
Vaccination of ewes at the end of gestation, decided with the veterinarian, on the other hand improves the quality of colostrum against other serious diseases of young lambs, notably enterotoxemia and tetanus, and indirectly contributes to the robustness of newborns.
Possible complications
Death within a few hours to a few days in severe forms.
Permanent nervous after-effects in survivors: head tilt, abnormal gait, blindness, apparent mental retardation.
Lambs that never catch up on growth and end up culled.
Extension of the infection to other organs: joints, eyes, lungs.
Abscess in the brain, with delayed worsening after apparent improvement.
When to see a veterinarian
A lamb stiffens, trembles or convulses: call immediately, at any time.
He keeps his head thrown back or his neck rigid.
He suddenly stops sucking and seems to no longer see.
He overreacts to noise or touch.
He has a large or oozing navel, or a swollen joint, associated with the slightest nervous sign.
He remains lying on his side, limbs outstretched.
Several lambs from the same batch present nervous disorders: this is a herd problem, call the veterinarian without waiting for the next case.
Prognosis
The prognosis depends above all on the precocity of the treatment. A lamb taken at the first signs of stiffness, before convulsions, can heal.
A lamb already lying down, convulsing or blind has a poor prognosis, and survivors often have after-effects.
At the flock level, the prognosis is good: colostrum, disinfection of the navel and cleanliness of the lambing pens make almost all cases disappear.
Frequently asked questions
My lamb stiffens and throws its head back, what is this?
This suggests damage to the nervous system, of which meningitis is a part, but other causes give the same picture, some of which are corrected within a few minutes. It's an emergency: call the vet immediately rather than guessing.
What does this have to do with the navel?
A direct and very frequent report. The navel is an open sore full of blood for the newborn. Bacteria that enter can travel to the joints, lungs or brain. Disinfecting the navel at birth is therefore also a prevention of meningitis.
My lamb is doing better, can I stop the treatment?
No. Improvement after a few days does not mean that the brain infection is gone. Quitting early exposes you to a relapse which is often fatal. Follow the duration indicated by the veterinarian until the end.
Are the other lambs at risk of catching it?
Not by direct contact: everyone becomes infected from the environment. But if one lamb develops meningitis, it means the lambing conditions are putting everyone else at risk. We must act on the cleanliness of the huts, the disinfection of navels and colostrum, not just treating the sick.
References
Content reviewed by the TunisieVet editorial team · Updated 09 September 2026
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