Respiratory infections are among the most common health problems in captive tortoises, caused by bacteria (especially Pasteurella, Mycoplasma, and Pseudomonas), viruses, or fungi. Signs include nasal discharge, open-mouth breathing, lethargy, and reduced appetite. Unlike mammals, tortoises cannot clear respiratory infections efficiently on their own — veterinary antibiotic treatment and husbandry correction are both required.
Last reviewed: June 2026
Why Tortoises Are Prone to Respiratory Infections
Tortoises are ectotherms whose immune function depends entirely on body temperature. When ambient temperatures fall below optimal range — or when tortoises are kept without adequate thermal gradients — their immune systems cannot mount effective responses to pathogens. As described in Mader's Reptile and Amphibian Medicine and Surgery, the vast majority of respiratory infections in captive tortoises arise secondary to suboptimal husbandry: temperatures too low, excessive humidity causing fungal colonization of respiratory mucosa, or inappropriate hibernation (brumation) attempts in animals that are not healthy enough for it.
Mycoplasma agassizii is a specific pathogen of desert tortoise species (Gopherus agassizii and relatives) that causes chronic upper respiratory tract disease (URTD) and is a significant conservation concern in wild populations. In pet tortoises, it is acquired from infected animals and persists as a lifelong, intermittently active infection.
Signs of Respiratory Infection in Tortoises
Early signs:
- Nasal discharge — thin and clear early, progressing to thick, white, or yellow-green mucopurulent discharge
- Nasal bubbling when the tortoise breathes
- Audible breathing sounds — wheezing, clicking, or gurgling
- More frequent open-mouth gaping
- Reduced activity, basking more or less than usual
- Decreased appetite
Progressive signs:
- Open-mouth breathing with neck extended (attempts to improve airway patency)
- Distinct bubbly or raspy respiratory sounds
- Palpable accumulation of mucus in the throat or glottis
- Weight loss in chronic cases
- Pneumonia in severe, untreated cases — consolidated lung tissue and potential death
The ARAV Reptile and Amphibian Resources, 2024 emphasize that any tortoise showing nasal discharge for more than 1–2 weeks should be evaluated by a reptile-experienced veterinarian, and that new tortoises should always be quarantined for at least 90 days before introducing to existing animals.
Diagnosis and Treatment
Diagnosis combines clinical signs, radiographs (to assess lung consolidation), and culture/sensitivity testing from nasal or tracheal washes. PCR testing for Mycoplasma is available at specialized labs. Treatment requires parenteral (injectable) antibiotics — enrofloxacin and oxytetracycline are commonly used against Mycoplasma; ciprofloxacin, trimethoprim-sulfa, or amikacin for bacterial pneumonia. Oral treatment is often inadequate in reptiles due to unpredictable gut absorption. Nebulization with antibiotics, bronchodilators, or acetylcysteine helps reach the respiratory tract directly. Concurrent husbandry correction (optimizing temperatures, reducing humidity to appropriate levels) is as important as the medication itself.
When to See a Vet
Call your vet today if:
- Your tortoise has nasal discharge that has persisted more than 7 days
- You can hear wheezing or bubbling sounds when your tortoise breathes
- Your tortoise is not eating and is less active than normal
Go to the ER immediately if:
- Your tortoise is gaping its mouth continuously and cannot close it
- Your tortoise is unresponsive to handling
- Your tortoise has made no movement and is cold despite proper ambient temperatures
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Frequently Asked Questions
Can tortoise respiratory infections spread to other tortoises? Yes — especially Mycoplasma, which can spread through direct contact and contaminated water sources. New tortoises should always be quarantined for a minimum of 90 days before introduction to an established group. Tortoises diagnosed with URTD should ideally be kept permanently separate from Mycoplasma-negative animals.
How long does tortoise respiratory treatment take? Treatment duration varies by infection severity and causative organism. Mild bacterial URIs may resolve with 4–6 weeks of antibiotics. Mycoplasma infections require 60–90 days or longer of treatment, and recurrence during stress or illness is common. Post-treatment monitoring with repeat nasal washes is recommended.
How much does tortoise respiratory infection treatment cost? An exotic reptile exam runs $75–$150. Radiographs add $100–$250. Culture and sensitivity testing adds $100–$200. Antibiotic injections (if administered at the clinic) cost $30–$80 per visit, often weekly for 4–8 weeks. Teaching the owner to inject at home reduces costs. Total treatment runs $400–$1,200 for an uncomplicated case.
Can I treat a respiratory infection in my tortoise at home? No — over-the-counter products, home remedies, and topical treatments are not effective against bacterial or Mycoplasma respiratory infections in reptiles. Supportive measures (warming the tortoise to the high end of its appropriate temperature range to support immune function, ensuring adequate hydration) help, but antibiotic therapy prescribed by a veterinarian is required.
Does hibernating a sick tortoise help recovery? Absolutely not. Hibernating (brumaing) a tortoise with an active respiratory infection is one of the most dangerous mistakes an owner can make. Lowered body temperature during brumation suppresses immune function, allowing pathogens to proliferate unchecked. Any tortoise with respiratory signs must be kept warm and active until fully recovered before brumation is considered.
Still Not Sure if Your Tortoise Needs a Vet?
When you're not sure if this is wait-and-see or call-tonight, Voyage AI Vet triages in under 2 minutes. Describe what you're seeing in chat, share photos of the nasal discharge, your tortoise's posture, and your enclosure setup, or hop on a live video call if you want a second pair of eyes. Every answer comes with citations to the actual veterinary literature it's pulling from — so you see exactly where the guidance comes from, not just a chatbot's word.