A woman wears a masks in Chinatown following the outbreak of the novel coronavirus, in Chicago, Illinois, U.S. January 30, 2020.

California, Nebraska and Illinois are the only U.S. states that can currently test for coronavirus, the Association of Public Health Laboratories (APHL) told Reuters on Friday.

The U.S. Centers for Disease Control and Prevention (CDC) last week said some of the testing kits sent to U.S. states and at least 30 countries produced "inconclusive" results due to a flawed component and the CDC planned to send replacement materials to make the kits work.

The CDC has set up surge testing capacity until new testing kits become available, said Scott Becker, the executive director of APHL, which represents public health laboratories in the United States.