
It is VERY IMPORTANT you consult your vet around suspected salmonella.
There could be government movement controls associated with it and it is important we get a definitive diagnosis.
There are various strains of Salmonella and it is important we identify which one we are dealing with for future prevention.
Calves pick it up from ingesting milk / colostrum from shedding cows, or contaminated by infected faeces. They spread it amongst themselves via faeces in feed or licking etc.

Clinical signs:
Depressed
Diarrhoea ( often with blood )
Dehydration
Fever ( >39.5 ) This often happens at an early age ( 3 - 10 days )
Pneumonia and coughing can be present ( SOMETIMES EXCLUSIVELY )
Sudden death is common.
You can culture the bacteria in the shit, saliva and nasal secretions. PM culture of intestines and lungs can be useful.
HUMANS CAN GET VERY SICK FROM THIS HYGENE IS CRITICAL
Treatment:
CONSULATE YOUR VET.
Electrolytes Pain relief like meloxicam. Antibiotic usually Trimethoprim sulphate in combination with Tetracyclines for 7 days.
Infected calves that recover will become chronic shedders of the bacteria in shit and milk and this will occur mainly in times of stress.