Mycoplasma infections in layer hens

🔬 What is Mycoplasma?

Mycoplasma infections in chickens are caused mainly by two species:

- Mycoplasma gallisepticum (MG) – affects the respiratory system.

- Mycoplasma synoviae (MS) – affects joints and can also cause respiratory issues.

These bacteria lack a cell wall, making them resistant to some antibiotics and capable of long-term colonization in birds.

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🩺 Symptoms to Watch For

🫁 Respiratory Signs

- Sneezing, coughing, and nasal discharge

- Gurgling or wheezing sounds when breathing

- Swollen sinuses and watery/foamy eyes

- Drop in activity or birds huddling

🦵 Musculoskeletal & Systemic Signs

- Lameness or swelling in joints

- Weight loss and poor growth in young chickens

- Lethargy, ruffled feathers

- Greenish diarrhea in severe cases

🥚 Egg Production Issues

- Drop in egg production (up to 30% or more)

- Misshapen or thin-shelled eggs

- Increased embryo death and poor hatchability

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🦠 Causes & Risk Factors

- Introduction of infected birds

- Poor ventilation or overcrowding

- Stress and poor hygiene

- Co-infections (e.g., E. coli, infectious bronchitis)

- Contaminated equipment or personnel

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🛡️ Prevention & Management Tips

- 🧼 Biosecurity is key! Limit visitors and clean regularly

- 🧪 Quarantine new birds before adding them to your flock

- 💉 Consider vaccination in high-risk areas

- 🌬️ Ensure proper ventilation to reduce respiratory stress

- 💊 In infected birds, antibiotics like tylosin or tiamulin may help — but consult your vet

- 🔍 Test for Mycoplasma using PCR or serology if you suspect infection

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💡 Quick Tip

Once infected, chickens can carry Mycoplasma for life — even if they seem healthy. Be cautious when introducing new birds and always observe good hygiene.