Swine flu (H1N1) vaccination. Young boy being vaccinated by a healthcare worker during the 2009 influenza pandemic. The sign is in three languages (from top: English, Spanish, and Arabic) for the benefit of immigrants in the area. This outbreak was caused by a strain of the H1N1 influenza virus. The vaccine that was developed was provided first to children aged five years or younger and other groups considered at risk. It was provided in two forms, a nasal spray and an injectable form. Photographed in October 2009, in Hamtramck, Michigan, USA.