Ongoing large outbreaks in states including South Carolina, Utah, and Texas continue to drive the U.S. measles case count, which reached 1,842 confirmed infections as of May 7 according to CDC surveillance data. With 93 percent of cases linked to outbreaks and 92 percent occurring among unvaccinated or unknown-status individuals, transmission remains elevated in under-immunized communities. The virus’s high contagiousness, characterized by a basic reproduction number of 12–18, sustains spread through respiratory droplets, particularly as summer travel increases importations. CDC weekly updates on case counts, hospitalization rates, and new jurisdictions reporting infections represent the key near-term data releases that could shift market-implied odds before the May 31 resolution.