As measles cases rise across the United States, Chicago has reported its second case this year.

One case involved a child recovering from measles at a migrant shelter in Pilsen.

The Chicago Department of Public Health is verifying residents' vaccination status and offering vaccines to the unvaccinated.

The other case, Chicago's first since 2019, involved an individual exposed to domestic and international travelers. 

However, the infection source is still unknown. 

The health department is actively tracing exposures, particularly at Swedish Hospital and on a specific bus route.

These Chicago cases reflect the national trend, with the Centers for Disease Control reporting 45 total U.S. cases this year across 17 states.

In January, the CDC had anticipated this increase due to global trends and decreasing vaccination rates. 

The recent local and national cases underscore the critical importance of high vaccination rates to prevent outbreaks.