Causative agent:-

Mycoplasma gallisepticum.

Species affected:-

Chickens, Turkeys, Ducks, Pigeons, Peafowl.

Clinical Signs:

Clinical symptoms vary slightly between species. Infected adult chickens may show no outward signs if the infection is uncomplicated. However, sticky, serous exudate from nostrils, foamy exudate in eyes, and swollen sinuses can occur, especially in broilers. The air sacs may become infected. Infected birds can develop respiratory rales and sneeze. Affected birds are often stunted and unthrifty.

There are two forms of this disease in the turkey. With the “upper form,” the birds have watery eyes and nostrils, the infraorbital (just below the eye) becomes swollen, and the exudate becomes caseous and firm. The birds have respiratory rales and show unthriftiness. With the “lower form”, infected turkeys develop airsacculitis. Thus, the condition may go unnoticed until the birds are slaughtered and the typical legions are seen. Birds with airsacculitis are condemned. Chronic Respiratory Disease and MG in chicken embryos can cause dwarfing, airsacculitis, and death.

Sticky exudate from nostrils & eyes & swollen sinuses

Sticky exudate from nostrils & eyes & swollen sinuses




CRD (MG) can be spread to offspring through the egg. Most commercial breeding flocks, however, are CRD (MG)-free. The introduction of infected replacement birds can introduce the disease to CRD (MG)-negative flocks. Chronic Respiratory Disease (MG) can also be spread by using contaminated equipment.

Also, Read: Animal Feed Supplement Suppliers In Russia


Outbreaks of CRD (MG) can be controlled with antibiotics. Tylosin, Erythromycin, Enrofloxacin, Levofloxacin, etc. all exhibit anti-mycoplasma activity and have given good results. Administration of most of these antibiotics can be by feed or water. These are effective in reducing clinical disease.

1. Antibiotics:

  • TT 62.5 (Tylosin Tartrate Powder 62.5%): follow the dosage schedule per the product label- administration through drinking water.
  • TT – BH (Tylosin Tartrate 63% & Bromhexine hcl 3 %): follow the dosage schedule as per product label- administration through drinking water.
  • ENROLIQ-B (Each ml contains: Enrofloxacin 200 mg & Bromhexine hcl 15 mg): @ 1 ml in 2 to 4 liters of drinking water
  • LECIN-L (Levofloxacin 10 %): @ 1 ml per 1 ltr of drinking water for 5-7 days

2. Supportive therapy in drinking water

  • BRANCHO CARE-DS (Herbal expectorant and bronchodilator): @ 1 ml in 5 liters of drinking water per100 bird for 7-10 days


Eradication is the best control of mycoplasma disease. Prevention programs should include vaccination, good sanitation, and the implementation of a comprehensive biosecurity program.