Infectious coryza is a bacterial respiratory disease of chickens. Infectious coryza is an upper respiratory disease of chickens caused by infection with H. paragallinarum(HPG) ⁽¹⁾. And mainly occurs in rainy season. Decreased effect of this disease may be attributed to improved methods of control.

Signs

Swelling around the face, foul smelling, thick, sticky discharge from the nostrils and eyes, labored breathing, and rales (rattles – an abnormal breathing sound) are common clinical signs.

Most prominent features of infectious coryza are an acute inflammation of the upper respiratory tract including the involvement of nasal passages and sinus with a serous to mucoid nasal discharge, facial edema and conjunctivitis ⁽²⁾.

Swelling around the face, foul smelling, thick, sticky discharge from the nostrils and eyes, labored breathing, and rales (rattles – an abnormal breathing sound) are common clinical signs ⁽⁵⁾.

Prevention

Vaccination with farm hygiene is the best preventive approach.

Vaccination with multi-serotype inactivated vaccines during the rearing period will reduce clinical signs/control Infectious Coryza ⁽³⁾.

Treatment

Enrofloxacin, Chloramphenicol, Ampicillin and Kanamycin are proven effective against H. paragallinarum. While the bacterium was found resistant to tetracycline and streptomycin, with 66% rate of resistance to cotrimoxazole⁽⁴⁾.

Differentiation

Because the symptoms of Mycoplasmosis is similar to coryza and if differentiation may not be plausable, antibiotics that deals with both disease is used such as enrofloxacin.

For differentiation with mycoplasma and coryza, it is good to perceive mycoplasma is as already present in dormant state and triggered with stress and commonly occurs in hot summer season whereas coryza is triggered in wet season by poor litter management.

References

1. G. Rajurkar, A. Roy & M. Yadav (2009). Incidence of Mixed Infection in Coryza Cases, Veterinary World, 2(12): p 462 / CC by 4.0
2. N. Muhammad TM & B. Sreedevi (2015). Detection of Avibacterium paragallinarum by Polymerase chain reaction from outbreaks of Infectious coryza of poltry in Andhra Pradesh, Veterinary World, 8(1): 104. / CC by 4.0
3. MSD Animal Health (2013) Important Poultry Diseases. Whitehouse Station: Intervet International B.V.. p 21
4. G. Rajurkar, A. Roy & M. Yadav (2010). Antimicrobial sensitivity pattern of Haemophilus paragallinarum isolated from suspected cases of infectious coryza in poultry, Veterinary World, 3(4): p 181 / CC by 4.0
5. B. P. Shankar (2008) Common Respiratory Diseases of Poultry, Veterinary World, 1(7): p 218 / CC by 4.0

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