Hiv transmission risk with a used needle new syringe recently took a b12 injection bit nurse changed needle needle was looking clean

Unclear info: Sharing needles is a know risk factor for HIV, if one of the users has HIV. If the nurse used a new needle for the injection, there is no risk. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex.