Maria Fernandez, 42, of Cancun, Mexico, sits outside a shoddy trailer she shares with other workers. "Everybody around here always has headaches, coughs, running noses," she said. "It has to do with that dust on the plants from the chemicals. You are always breathing it in."

The Pepin Comic Book series covers seven immunization topics: Td, Chickenpox, MMR, DTaP, Hep A, Hep B, and After the Shot. These low literate, popular education materials are available in English and Spanish to help clinicians educate parents about the importance of getting their children vaccinated.