Pollorum disease in fowls is caused by Salmonella, Mycobacterium, Hemophilus, or Clostridium?

Pollarum or white diarrhoea is caused by bacterium Salmonella pullorum. The disease spreads through contaminated food and water and is characterised by loss of appetite and difficulty in breeding. Some other poultry diseases are as follows:

Ranikhet - viral disease
Fowl pox - viral disease
Fowl cholera - Pasteurella multocida
Coryza - Haemophilus gallinarum.