Bordetella bronchiseptica Infection in Guinea Pigs

Bordetella bronchiseptica infection is a contagious bacterial respiratory disease in guinea pigs. It most often affects the nose, sinuses, windpipe, and lungs, but it can also involve the eyes and middle ears. In guinea pigs, this organism is considered especially aggressive compared with some other species.

This infection may cause upper respiratory signs at first, such as sneezing or discharge from the nose and eyes, then progress to pneumonia. Some guinea pigs become very quiet, stop eating, lose weight, or die suddenly. Young, older, pregnant, and stressed guinea pigs are often at higher risk for severe illness.

Because guinea pigs hide illness well, even mild signs deserve prompt attention from your vet. Early care matters. A guinea pig that is breathing harder than usual or eating less can become critically ill in a short time.

Bordetella bronchiseptica infection is caused by exposure to the bacterium Bordetella bronchiseptica. It spreads through close contact with infected animals, respiratory droplets from sneezing or coughing, and contaminated items such as bedding, cages, food bowls, or hands that move between animals.

One important risk factor is contact with rabbits. Rabbits may carry this bacterium in their respiratory tract without obvious illness, but guinea pigs can become very sick after exposure. For that reason, rabbits and guinea pigs should not be housed together.

Stress and poor husbandry can also make infection more likely or more severe. Overcrowding, poor ventilation, sudden temperature changes, damp bedding, transport stress, pregnancy, and underlying illness can all reduce a guinea pig's ability to fight infection. In some cases, more than one respiratory pathogen may be involved, so your vet may consider other bacterial causes of pneumonia too.

Your vet will start with a physical exam, listening to the chest, checking breathing effort, looking for nasal or eye discharge, and asking about appetite, weight loss, recent stress, and any contact with rabbits or other sick animals. Because guinea pigs often become unstable with handling, the exam may be kept gentle and focused.

Diagnosis is often based on the combination of clinical signs and history, but testing may be needed to confirm the cause and assess severity. Your vet may recommend chest radiographs to look for pneumonia, along with nasal, conjunctival, or tracheal samples for bacterial culture and sometimes PCR testing. Culture can help identify the organism and guide antibiotic selection.

Additional testing depends on how sick your guinea pig is. Your vet may monitor body weight, hydration, oxygenation, and temperature, and may recommend bloodwork in some cases. If there is head tilt or ear pain, imaging or ear evaluation may be discussed. Because several infections can look similar, diagnosis often includes ruling out other causes of guinea pig respiratory disease.

Prevention starts with housing and biosecurity. Do not keep rabbits with guinea pigs, and avoid shared airspace, bedding, bowls, or cleaning tools when possible. Wash your hands between handling animals, and quarantine new guinea pigs before introducing them to the group.

Good husbandry lowers risk. Keep the enclosure dry, clean, and well ventilated without drafts. Avoid overcrowding, sudden temperature swings, and damp bedding. Reduce stress during transport and introductions, and make sure your guinea pig has steady access to hay, fresh water, and an appropriate guinea pig diet so the immune system is better supported.

Watch closely for early respiratory signs, especially in young, older, pregnant, or recently stressed guinea pigs. Prompt veterinary care for sneezing, discharge, or appetite changes can help prevent a mild infection from becoming pneumonia. There is no routine pet guinea pig vaccine for this condition, so prevention depends mainly on separation from carriers, sanitation, and early intervention.