On any given day at any given pediatrician’s or family physician’s office, you’re likely to find several young adults—tweens and teens—popping in for a Gardasil vaccine, which is intended to prevent infections from four strains of the human papillomavirus (HPV). These visits take just a few minutes of a nurse’s time. Then, since fainting is a common side effect of the vaccine, the patient is supposed to sit or lie down for 15 minutes to avoid injuries. Whether a practice follows this U.S. Centers for Disease Control and Prevention (CDC) observation guideline or not is usually up to the provider….