• Pattern: Epidemiology and outbreak science drive early 20th-century public health, with systematic attention to disease transmission, case counting, and progression across settings. Influenza, encephalitis, and pediatric infections are tracked in outbreaks and cross-site surveillance, signaling a shift toward epidemiologic reasoning across communities, clinics, and institutions [4], [5], [6], [15], [16], [17].

• Pattern: Environmental and physiological determinants of health become central to public health, linking atmospheric conditions, altitude, heat balance, gas exchange, and respiration to disease risk and health outcomes. Studies span high-altitude biology, thermal physiology, and respiratory physiology [2], [10], [12], [13], [14].

• Pattern: Metabolic health and nutrition as public health levers, integrating fat-soluble vitamins, diabetes metabolism, infant nutrition, and disease incidence into preventive strategies. This triad recurs across rickets, infant health, and metabolic research [3], [9], [16], [19], [20].

• Pattern: Clinical disease understanding through diagnostics, host response, and pathology with implications for public health policy, including heredity of skin diseases, infectious disease case reporting, and diagnostic radiography/chemistry in pediatrics [16], [17], [18], [19].