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Respiratory Infection in Reptiles
One of the most common health issues in captive reptiles, usually triggered by improper temperature or humidity. Can progress from mild nasal discharge to life-threatening pneumonia. Early detection and husbandry correction are essential.
Last updated: 2026-05-06
Severity
moderate
When to Act
See Vet Today
Symptoms & Signs
Bubbles or discharge from nose/mouth
Clear or thick discharge, sometimes forming bubbles at the nostrils.
Open-mouth breathing
Reptile breathes with mouth open — this is abnormal and significant.
Wheezing or clicking sounds
Audible respiratory sounds — crackles, pops, or whistles when breathing.
Lethargy and anorexia
Reptile is inactive, doesn't bask, and refuses food.
Excess mucus in the mouth
Stringy, rope-like mucus visible when the mouth is opened.
Behavioral Changes to Watch For
Pets can't tell us what's wrong. These behavioral changes are often the first clues that something is wrong.
🐾 Lethargy and not basking
Reptile stays in the cool end, too weak to thermoregulate.
What You May Notice:
Your reptile is cold to the touch and hiding, not moving to their basking spot.
Causes & Risk Factors
Causes
- •Bacterial infection (most common) — Aeromonas, Pseudomonas, Pasteurella, Mycoplasma
- •Fungal infection (less common) — often in immunosuppressed reptiles
- •Viral infection — paramyxovirus, herpesvirus, iridovirus
- •Parasitic — lungworms in some species
- •ALMOST ALWAYS triggered by improper husbandry (too cold, too humid/dry)
Risk Factors
- ⚠Low ambient temperature (below the species' preferred optimal temperature zone)
- ⚠Incorrect humidity (too high for desert species, too low for tropical species)
- ⚠Overcrowding and poor ventilation
- ⚠Dirty enclosure — ammonia from accumulated waste
- ⚠Concurrent illness or malnutrition
- ⚠Stress from transport or improper handling
How It's Diagnosed
- 1Clinical signs + husbandry history
- 2Physical examination — assess respiratory rate and effort
- 3Culture and sensitivity of tracheal wash or nasal discharge
- 4Radiographs to assess lung involvement
- 5Blood work to evaluate systemic illness
Treatment Options
Antibiotic Therapy
Systemic antibiotics are the main treatment for bacterial respiratory infections.
Steps
- 1.Enrofloxacin (Baytril) — most commonly used broad-spectrum antibiotic for reptiles
- 2.Ceftazidime — injectable, every 72 hours, for gram-negative infections
- 3.Treatment typically 14-21 days minimum
- 4.Nebulization with antibiotics + saline for deep respiratory involvement
- 5.Treatment based on culture results when possible
Expected Outcome
Clinical improvement within 5-7 days with appropriate antibiotics.
Precautions
- !Long courses are essential — stopping early leads to relapse
- !Injections are often more effective than oral medication in reptiles
Husbandry Correction
Without fixing husbandry, the infection will recur.
Steps
- 1.Increase ambient temperature to the upper end of the species' optimal range
- 2.Provide a proper thermal gradient (warm basking spot + cooler area)
- 3.Correct humidity to species-appropriate levels
- 4.Improve ventilation — reduce stagnant air
- 5.Deep clean and disinfect the enclosure
- 6.Ensure proper UVB lighting to support immune function
Expected Outcome
Immune system can more effectively fight infection at proper temperatures.
Precautions
- !Reptiles are ectothermic — their immune function is directly temperature-dependent
Common Medications Used
| Medication | Usage | Important Notes |
|---|---|---|
| Enrofloxacin (Baytril) | Broad-spectrum antibiotic for reptile respiratory infections | Injectable form preferred. Can cause tissue necrosis at injection sites — rotate sites. |
| Ceftazidime | Injectable cephalosporin — excellent gram-negative coverage | Every 72 hour dosing. Must be reconstituted and stored properly. |
Prevention
- ✓Maintain species-appropriate temperatures with a thermal gradient
- ✓Correct humidity levels — use a hygrometer to monitor
- ✓Good ventilation with adequate airflow
- ✓Regular enclosure cleaning
- ✓Quarantine new reptiles for 30-90 days
- ✓Annual veterinary checkups
When to See a Veterinarian
- ⚠️Bubbles or discharge from nostrils
- ⚠️Open-mouth breathing
- ⚠️Audible breathing sounds
- ⚠️Not eating + respiratory signs
Frequently Asked Questions
Why is temperature so important for sick reptiles?
Prognosis
Good if caught early and husbandry is corrected. Guarded if pneumonia is advanced. Chronic respiratory infections can cause permanent lung damage.
References
- [1] Mader's Reptile Medicine
- [2] ARAV — Respiratory Disease in Reptiles
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