Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Seek emergency care for severe trouble breathing, blue or grey lips, confusion, fainting, extreme drowsiness, severe chest pain, or signs of shock such as cold clammy skin with marked weakness.
These symptoms can have many causes, but they need immediate assessment.
And for anyone, someone who:
has had a seizure that will not stop, or does not wake up afterwards
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Seek prompt medical advice if you develop fever after a tick or biting-fly bite, handling a wild animal, drinking untreated water, or breathing dust around a dead animal.
Mention the exposure even if it occurred up to two weeks earlier.
Arrange same-day assessment for:
A skin ulcer with swollen or painful lymph nodes
A red, painful eye, especially with discharge or light sensitivity
Persistent high fever or worsening weakness
Cough, chest discomfort, or shortness of breath
Symptoms that are not improving after antibiotics have started
Fever that returns after treatment
And for anyone, someone who:
has a fever with a stiff neck, a rash that does not fade under pressure, or severe headache
Every sign above is quoted from the sofidex article on Rabbit fever. If you are not sure, err upward — it is always reasonable to be checked.