Salmonella

It is gram negative, rod shaped, capsulated and aerobic bacterium.

Habitat:

v  Normal flora of cattle

v  Contaminated food and water

Mode of transmission:

§  Some may act as a carrier (Human carriers)

§  Orofaecal transmission

Subtypes:

Salmonella – Typhi

Salmonella – Paratyphi

                Both the above types cause enteric fever (typhoid fever).

Antigens:

ü  Somatic antigen (O):

ü  Flagellar antigen (H):

ü  Capsular antigen (Vi Antigen):

Toxins:

o   Endotoxin

Pathology:

·         Enteric fever (typhoid fever)