The use of tissue culture to produce vaccines is a key tool in the development of immune systems against pathogens. Nicholas Kellar, a native of Warren, Ohio, works in the tissue culture industry and explains how this technique is helping shape vaccine production. Using plants rather than animals for this process reduces the risk of creating a new "super bug" or other pathogen and is lower in cost. Kellar also mentioned two types of vaccines: subunit vaccines and edible vaccines. He believes these techniques will be vital in the future due to the rapid growth of global society and rapid response for emerging diseases.