Kiyana Esco needs free school lunches and breakfasts to feed her six children. But with schools shutting down over coronavirus concerns, she's scrambling to pick up the meals, care for her kids and keep her job.

Alarming clusters of the coronavirus swelled on both coasts of the U.S. on Tuesday, with more than 70 cases now tied to a biotech conference in Boston and infections turning up at 10 nursing homes in the hard-hit Seattle area.

California health officials on Friday confirmed the second case of novel coronavirus in the United States believed to have been transmitted to a person who didn't travel internationally or come in close contact with anyone who had it.

Residents of a Northern California community are at the epicenter of what officials are calling a turning point in the spread of the highly contagious coronavirus, as investigators try to retrace the steps of a hospitalized patient they believe to be the first in the U.S. to be infected without traveling internationally or being in close contact with anyone who had it.