Initially organized as the Pediatric Infectious Disease Section in 1992 through the pioneering efforts of Drs. Lulu Bravo, Salvacion Gatchalian and Ma. Liza Gonzales, the Section aimed to engage in various services, training and research efforts to answer the needs of pediatric patients throughout the hospital.

The Section has been instrumental in setting up hospital programs such as nosocomial surveillance, TB treatment, immunization, and animal bite treatment services. The Section likewise initiated a post-residency fellowship training program and has since graduated 30 trainees serving the needs of different regions in the country.

Renamed in 2004 as the Section of Infectious and Tropical Diseases in Pediatrics (INTROP), it remains steadfast in its efforts to provide excellent patient care and outstanding clinical and research education.