Final answer:
The first action after an accidental needle stick with a contaminated needle is to report the incident to the supervisor or occupational health.
Step-by-step explanation:
After an accidental needle stick with a contaminated needle, the first action should be to report the incident to the supervisor or occupational health. This is important because after a needle stick injury, there is a risk of transmission of blood-borne pathogens such as HIV or hepatitis. By reporting the incident, the necessary steps can be taken to evaluate the risk, provide appropriate medical care, and follow any necessary protocols to prevent infection.