Infectious rhinitis of guinea pigs
Infectious rhinitis is an inflammation of the upper respiratory tract of guinea pigs, often caused by bacteria such as Bordetella bronchiseptica or Streptococcus pneumoniae. It frequently affects pet guinea pigs, especially in poor hygiene...
What is it?
Infectious rhinitis is an inflammation of the upper respiratory tract of guinea pigs, often caused by bacteria such as Bordetella bronchiseptica or Streptococcus pneumoniae. It frequently affects pet guinea pigs, especially in poor hygiene or housing conditions. This illness can remain mild but sometimes progresses to serious pneumonia if not treated in time.
Key point
In guinea pigs, an untreated respiratory infection can quickly progress to serious pneumonia, potentially fatal within a few days.
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:
The first signs are repeated sneezing and discharge from the nose, sometimes clear then thicker.\nThe guinea pig may also have watery or slightly stuck eyes.\nWe often observe a drop in appetite, a less active animal, sometimes hidden in a corner of its cage.\nIf the infection goes down to the lungs, breathing becomes noisy, rapid, even difficult: this is a sign of emergency.\nIn some cases, the infection can reach the ear internal, causing a tilted head or loss of balance.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
Infectious rhinitis is most often due to opportunistic bacteria which take advantage of a drop in immune defenses or stress. Bordetella bronchiseptica is frequently the cause, sometimes in association with Streptococcus pneumoniae or other germs. These bacteria can be present without causing illness in a healthy guinea pig, and can appear when weakened.
Poorly ventilated, humid or too cold housing promotes the disease.\nDirty litter or an accumulation of ammonia irritates the respiratory tract and facilitates infection.\nStress, a sudden change in environment, or cohabitation with a new animal increase the risk.\nA diet low in vitamin C weakens the immune defenses of the guinea pig, which does not synthesize it itself.\nYoung guinea pigs, elderly or already sick animals are more vulnerable.
Transmission
Transmission occurs by direct contact between guinea pigs, by respiratory secretions (sneezing, droplets) or by contaminated equipment (litter, bowls, cage). A healthy carrier guinea pig can transmit the bacteria without showing symptoms. The guinea pig can also be contaminated by a recently introduced guinea pig, or by contact with other species such as rabbits or dogs carrying Bordetella.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian first carries out a complete clinical examination, listening to breathing and observing discharge. Nasal or eye swabs can be analyzed in the laboratory to identify the bacteria in question. In more severe cases, a chest x-ray can be used to check whether the lungs are affected. The diagnosis also takes into account the animal's living conditions and recent history (new companion, change of cage).
Treatment
Treatment is generally based on antibiotic therapy adapted to guinea pigs, because certain common antibiotics are toxic to them and should never be used without veterinary advice. Supportive care may be offered: rehydration, stimulation of appetite, improvement of the environment. A vitamin C supplement is often recommended to support natural defenses during convalescence.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Maintaining a clean, well-ventilated cage with regularly changed litter limits respiratory irritation.\nAvoiding cold drafts and sudden temperature variations protects the guinea pig's fragile respiratory tract.\nA diet rich in vitamin C, provided by fresh vegetables or a suitable supplement, strengthens immunity.\nQuarantining any new guinea pig before introducing it into a group reduces the risk of contagion.\nAvoiding contact with Rabbits or other animals that can carry Bordetella without being sick is also recommended.
Possible complications
If left untreated, the infection can travel to the lungs and cause pneumonia, which is potentially fatal in guinea pigs. Damage to the inner ear can lead to lasting balance problems. Since the guinea pig is an animal that easily hides its signs of illness, a delay in treatment often worsens the prognosis.
When to see a veterinarian
Repeated sneezing or runny nose that persists for more than a day or two
Breathing becomes noisy, rapid or difficult
Guinea pig who refuses to eat or remains prostrate
Head tilted, loss of balance or abnormal gait
Eyes that run or remain half-closed unusually
Prognosis
The prognosis is good if the disease is treated early, before the lungs are affected. He becomes more reserved in the event of established pneumonia, the guinea pig's breathing being fragile. Regular monitoring and prompt treatment significantly improve the chances of complete recovery.
Frequently asked questions
My guinea pig sneezes from time to time, is it serious?
An occasional sneeze is not necessarily cause for concern, especially if there is no discharge or change in behavior. But if it repeats itself or is accompanied by other signs, a consultation is recommended.
Can I give a human antibiotic to my guinea pig?
No, especially not without veterinary advice. Some common antibiotics are toxic to guinea pigs and can seriously disrupt their digestive flora, sometimes fatally.
Can a guinea pig transmit this disease to a rabbit?
Yes, certain bacteria like Bordetella bronchiseptica can circulate between guinea pigs, rabbits and even other animals. It is prudent to avoid direct contact between different species, especially if one shows respiratory signs.
How to prevent the disease from returning?
Good cage hygiene, a diet rich in vitamin C and the absence of cold drafts significantly reduce the risk of recurrence.
References
AVMA — American Veterinary Medical Association
WSAVA — World Small Animal Veterinary Association
Content reviewed by the TunisieVet editorial team · Updated 19 September 2026
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