Question

In the case of poultry, antibiotics are used in the treatment of
(a)Infectious coryza
(b)Gumboro disease
(c)Brooder's pneumonia
(d)Aflatoxicosis

Answer 1

Antibiotics can be used for bacterias only. It doesn’t work on fungal and viral infections. In animal husbandry, animals are prone to many diseases and infections. Bacterial diseases can be treated by antibiotics like ionophores and tetracycline.

Complete answer:
Infectious coryza is a bacteria-caused disease of poultry and is cured by injecting antibiotics. New generation antibiotics such as fluoroquinolones, macrolides, etc are effective against infectious coryza. It is found worldwide and isn’t normally a fatal disease.

Additional Information: Infectious coryza is an upper respiratory disease of chickens caused by Haemophilus paragallinarum bacteria. Symptoms include nasal discharge, lacrimation, diarrhea, facial swelling, etc.
Here's some information about the other diseases mentioned in the question-
-Gumboro disease: It is a highly contagious disease that often causes a sudden but rapid increase in the mortality rate of chickens. This occurs in young chickens as well as turkeys. This disease is caused by IBDV or infectious bursal disease virus. Symptoms of this are depression, diarrhea, dehydration, etc.
-Brooder's pneumonia: This disease mostly affects the newly hatched chickens. It is a non-contagious and opportunistic infection of the respiratory tract. Aspergillus molds cause this infection.
-Aflatoxicosis: It mainly causes livestock such as cattle and swine. Specifically, young pigs are prone to this disease. Fungal species such as Aspergillus parasiticus cause this disease by producing aflatoxins in the grains and feed sources like corn, soybean, peanuts, etc, which the livestock eat. In chickens, Aflatoxicosis causes liver damage, decreased egg production, etc.
So, the correct answer is ‘Infectious coryza’.

Note: Antibiotics are used in diseases caused by bacteria and don’t work for viral and fungal infections. Gumboro disease is a viral disease whereas Brooder's pneumonia and aflatoxicosis are fungal Infections. So antibiotics can't treat those diseases. However, infectious coryza is a bacterial disease that can be treated by bacteria such as macrolides.