Unless the Nurse signed something to agree to taking any immunizations the Employer required that should not have fired Him or Her.
I predict if this Nurse goes to Court the Nurse will get the Job back and back pay.

All of us have the right to refuse treatment.

I saw this on TV. The Flu Virus mutates rather quickly. They need to make the Flu Virus Medication/Shots a head of time and they kind of make an educated guess as to what exact Virus is likely to make it to the US.

So you could be getting an absolutely useless Flu Shot that does not match the Virus.

This was back in 1970-1973 when I was a Medic in the Army. They required the Flu Shots and I am the one who gave them.
My observations of what happened to other People was most had no side effects, some got sniffles and headaches and a few actually got almost full Flu Symptoms.

Since I was the one of the People giving the Shots I never took the Shots Myself; but, I just stamped my Shot record saying I had taken the Flue Shots.

As the other Member said Hispital Workes refusing the Flu Shot should be required to wear a Mask during Flu Season.

But, what about Visitors in the Hospital?

By the way I still do not take Flu Shots and would not do so unless getting sick would cause a life threatening issue with My Respiratory System.
Also note I recently sent in My Application to renew My Respiratory Car Lic.; for some reason in CA a Respiratory Therapist is called a Respiratory Care Practitioner.

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84 300D, 82 Volvo 244Gl Diesel