Philadelphia

Epidemiological Brief

Philadelphia scores 11.01 (LOW risk) as of 2026-08-07 — the lowest composite score among all 16 host cities. Pertussis is the largest component at 23.9/100, indicating low-level whooping cough activity in Pennsylvania. Mpox contributes 20/100 at sentinel-level, reflecting background community transmission in the Mid-Atlantic region. Influenza-like illness contributes 10.5/100 with a Pennsylvania ILI rate of 2.9%. Dengue contributes 3.1/100 from travel-associated reports; COVID-19 is at minimal background level. No measles signal is present in the current reporting window. Wastewater surveillance (ATCP-73RE) monitors COVID-19 without triggering an alert. Data coverage is low (50%), meaning signals may be underestimated; this is the lowest coverage tier among US cities in this cycle. Conditions are warm and humid (28°C, 82% relative humidity, no precipitation). International arrivals total 8,710. Despite the low overall risk, the reduced data coverage warrants a degree of caution. Routine respiratory hygiene, pertussis vaccination verification for unvaccinated individuals, and standard mpox precautions are recommended. No enhanced communicable disease interventions are indicated at this time.

Model SCEME v3.1 · Updated August 7, 2026

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