Final answer:
The nurse should first wash the site of injury with soap and water. They should then complete an incident report and seek further medical advice.
Step-by-step explanation:
In the event of a needle stick injury, the nurse should first wash the site of injury with soap and water. This is important to reduce the risk of infection. After washing the site, the nurse should then proceed to complete an incident report and seek further medical advice, including consent for HIV testing and postexposure treatment with antiretroviral medications, if necessary.