Pictures of Bacterial Diseases Symptoms in Chicken. Clinical signs, Gross Pathological Lesions, Treatment. Infectious Coryza, Mycoplasmosis, Colibacillosis, Necrotic enteritis, Fowl cholera, etc.

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Coryza in chicken

Etiology: Bacterial Diseases Agen in Poultry

Infectious Coryza

Infectious coryza is caused by a bacterium, that is Avibacterium paragallinarum, a gram-negative, catalase-negative, nonmotile, pleomorphic,  microaerophilic rod that requires nicotinamide adenine dinucleotide (V-factor) for in vitro growth.


Mycoplasmosis is caused by  Mycoplasma species.  These bacteria have been isolated from avian hosts; M gallisepticum (MG), M synoviae (MS), M iowae and M meleagridis,  are the most important. Each has distinctive epidemiologic and pathologic characteristics. Mycoplasmas are bacteria that lack a cell wall and are the smallest prokaryotes.

Necrotic Enteritis (NE)

Necrotic Enteritis is caused by gram-positive bacteria, obligate, anaerobic bacteria Clostridium perfringens. There are two primary C perfringens types, A and C, associated with necrotic enteritis in poultry. Toxins produced by the bacteria cause damage to the small intestine, liver lesions, and mortality. Clostridium perfringens is readily found in soil, dust, feces, feed, and used litter. It is also a normal inhabitant of the intestines of healthy chickens. The enterotoxemia that results in clinical disease most often occurs either after a change in the intestinal microflora or from a condition that results in damage to the intestinal mucosa, ex. coccidiosis.


Colibacillosis caused by Escherichia coli. It is a gram-negative normally found in the intestine of poultry and most other animals. Although most serotypes are nonpathogenic, a limited number produce extraintestinal infections. Avian pathogenic E coli (APEC) strains are common of the O1, O2, and O78 serogroups. Large numbers of E coli are maintained in the poultry house environment through fecal contamination. Initial exposure to APEC may occur in the hatchery from infected or contaminated eggs. Systemic infection occurs when large numbers of APEC gain access to the bloodstream from the respiratory tract and intestine.