Elevated West Nile virus activity in New York City this season, driven by a record 1,769 positive mosquito pools and 29 confirmed neuroinvasive disease cases through early October, has shifted trader focus toward the 35–49 bin. NYC Department of Health surveillance shows this pace already exceeds 2025’s full-year total of 16 neuroinvasive cases, aligning closer to the 2022–2025 average of roughly 25–31 annually. Peak transmission typically extends into October, with additional reports expected from ongoing hospitalizations meeting encephalitis, meningitis, or acute flaccid paralysis criteria. The market-implied 49% probability on 35–49 reflects this upward trajectory amid favorable mosquito conditions, while lower bins capture the chance of rapid seasonal decline and the 50+ outcome accounts for further intensification before year-end resolution.