Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services for collapse, severe confusion, trouble breathing, blue or mottled skin, or other signs of possible sepsis.
Sepsis is a dangerous whole-body response to infection.
Contact a healthcare professional promptly if diarrhea or vomiting is not improving after a couple of days, or sooner if you are at higher risk of serious illness.
Medical advice is also appropriate for blood in the stool, a high or persistent fever, severe stomach pain, or difficulty keeping fluids down.
Seek prompt advice for a baby, an older adult, or someone with a weakened immune system who develops possible salmonellosis.
These groups can become dehydrated or develop invasive infection more quickly.
Get urgent medical help for signs of significant dehydration, including:
Every sign above is quoted from the sofidex article on Salmonellosis. If you are not sure, err upward — it is always reasonable to be checked.