Dr. Messina is the chief of the Division of Infectious Disease at Johns Hopkins All Children's Hospital. She joined the pediatric infectious disease program in 2006. She became chief of the medical staff in January 2024. A graduate of Vanderbilt University School of Medicine, she completed her pediatric residency at University of Texas-Southwestern Medical Center/Children's Medical Center, Dallas, followed by a pediatric infectious diseases fellowship at UT/Southwestern Medical Center. She was a staff pediatrician at Children's Medical Center Dallas.
In the Johns Hopkins Medicine Clinical Awards, Dr. Messina was named Johns Hopkins All Children’s Hospital physician of the year in 2019 and led a COVID-19 Analytic Response Team that received the Armstrong Award for Excellence in Quality and Safety in 2022.
Dr. Messina is a fellow of the American Academy of Pediatrics. She is a member of the Pediatric Infectious Disease Society, the American Society for Microbiology and the Infectious Disease Society of America. Dr. Messina serves as a reviewer for the Pediatric Infectious Disease Journal.