The nurse is preparing to start an IV on a newly admitted patient. Which action by the nurse places the patient at risk for infection?

A. Cleaning the insertion site with an alcohol pad is an appropriate infection-prevention measure and reduces microbial contamination. B. Blowing on the site after cleansing can introduce bacteria from the nurse’s breath and contaminates the skin, increasing the risk of infection at the IV insertion site. C. Donning gloves before starting the IV is a standard precaution to maintain asepsis and protect both patient and nurse. D. Applying a tourniquet is necessary to assess veins and does not inherently increase infection risk if proper hand hygiene and skin preparation are followed.