His primary areas of study are Virology, Incidence, Pediatrics, Immunology and Outbreak. Robert F. Breiman interconnects Pathogen, Microbiology and Clade in the investigation of issues within Virology. His Incidence study also includes Bacteremia which is related to area like Mortality rate, Environmental health and Veterinary medicine most often made with reference to Typhoid fever, Medical record and related Cause of death. His Pediatrics study integrates concerns from other disciplines, such as Developing country, Rotavirus vaccine, Case fatality rate, Vaccination and Global health. Robert F. Breiman has included themes like Internal medicine, Group A and Pneumonia in his Immunology study. His Outbreak study combines topics from a wide range of disciplines, such as Transmission, Legionnaires' disease, Serology and Legionella.