California patient with unknown origin of coronavirus is in serious condition, official says CNNCalifornia is monitoring at least 8,400 people for the coronavirus CNBCNorCal coronavirus patient was not tested for several days; officials retracing her steps KTLA Los AngelesNew coronavirus case escalates US response | News fortworthbusiness.comCoronavirus Q&A: What California parents and students should know about COVID-19 EdSourceView Full Coverage on Google News