Kylie Whiteside, 7, tries her hand at an immunity game of chance while Nicole Putnam, left, a graduate student in Pathology, Microbiology and Immunology at Vanderbilt, cheers during “MEGAMicrobe” on Saturday, Oct. 28, at the Martin Professional Development Center in Nashville. More than 200 children attended the free event, which offered explorations into the world of microbes and immune defenses. Some participants, like Kylie, dressed up in microbial costumes. The event was hosted by the Vanderbilt Institute for Infection, Immunology and Inflammation.