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 medical help if you or someone with a recent fever develops:
A seizure
Severe confusion, collapse, or difficulty waking
New paralysis or marked muscle weakness
Trouble breathing or swallowing
A sudden severe headache with a stiff neck or neurological symptoms
These signs may indicate inflammation of the brain or spinal cord, or another condition needing immediate treatment.
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
Contact a healthcare professional promptly if fever is persistent or worsening, you cannot keep fluids down, you are passing very little urine, or symptoms follow a known mosquito exposure in an area with West Nile virus activity.
Earlier advice is also reasonable if you are older, immunocompromised, or have had an organ transplant.
New or worsening neurological symptoms should be assessed urgently rather than waiting for a routine appointment.
And for anyone, someone who:
has a fever with a stiff neck, a rash that does not fade under pressure, or severe headache
3
Does any of this apply?
Book an appointment
After a confirmed infection, routine follow-up is appropriate if fatigue, weakness, balance problems, pain, or concentration difficulties continue.
Every sign above is quoted from the sofidex article on West nile fever. If you are not sure, err upward — it is always reasonable to be checked.