Changes

Salmonella spp. are gram-negative straight rods, usually flagellated, facultative anaerobes.  

Salmonella spp. are gram-negative straight rods, usually flagellated, facultative anaerobes.  

*Young and debilitated animals susceptible

*Young and debilitated animals susceptible

*''Salmonella'' serotypes:

*''Salmonella'' serotypes:

**''S.'' Tymphimurium infects many species; causes severe diarrhoea; non-invasive; causes of food poisoning in humans, e.g. from infected poultry

**''S.'' Typhimurium infects many species; causes severe diarrhoea; non-invasive; causes of food poisoning in humans, e.g. from infected poultry

**''S. enteritidis'': non species-specific; losses in young birds; causes food poisoning in humans

**''S. enteritidis'': non species-specific; losses in young birds; causes food poisoning in humans

**''S.'' Dublin: invasive serovar; infects cattle

**''S.'' Dublin: invasive serovar; infects cattle

**Die within 48 hours if not treated

**Die within 48 hours if not treated

**Persistent diarrhoea, meningitis, arthritis or pneumonia may occur in surviving animals

**Persistent diarrhoea, meningitis, arthritis or pneumonia may occur in surviving animals

**Found in [[Joints Inflammatory - Pathology#In Horses|arthritis of horses]]

**Found in [[Infectious Arthritis#In Horses|arthritis of horses]]

**Can cause haemorrhagic disease by [[Platelet Abnormalities|secondary thrombocytopenic disease]]

**Can cause haemorrhagic disease by [[Platelet Abnormalities|secondary thrombocytopenic disease]]

**''S.'' Cholerae-Suis in pigs causes blue discoloration of ears and snout; co-infection with viruses causes severe clinical forms of disease

**''S.'' Cholerae-Suis in pigs causes blue discoloration of ears and snout; co-infection with viruses causes severe clinical forms of disease

***Abortion with no other clinical signs  

***Abortion with no other clinical signs  

***Chronic infections with ''S.'' Dublin in calves cause dry gangrene of extremities due to disseminated intravascular coagulation; tips of ears, tail and limbs may slough

***Chronic infections with ''S.'' Dublin in calves cause dry gangrene of extremities due to disseminated intravascular coagulation; tips of ears, tail and limbs may slough

***Can cause [[Bones Inflammatory - Pathology#Osteomyelitis|Osteomyelitis]] in young animals

***Can cause [[Osteomyelitis|Osteomyelitis]] in young animals

***Most survivors become subclinical excretors

***Most survivors become subclinical excretors

***May become latent carriers with no excretion

***May become latent carriers with no excretion