A second child was taken to Riverside University Health System-Medical Center after developing a fever Wednesday while under quarantine at March Air Reserve Base, authorities said.

The child was tested for the new coronavirus and is awaiting results, Riverside County Department of Public Health spokesman Jose Arballo Jr. said.

On Monday, a child was taken to the medical center after developing a fever. The child — a 10-month-old boy, according to documents obtained by Newsweek — was returned to the base Wednesday by government vehicle after testing negative for the virus, Riverside public health officials said.

The children are among a group of 195 Americans who are under a mandatory 14-day federal quarantine at the base that began Jan. 29. The travelers — among them, U.S. diplomats and their families — fled Wuhan, China, the epicenter of the coronavirus outbreak.


Additionally, a traveler who landed at Los Angeles International Airport on Monday and was transferred to the base has been released after a short quarantine. Arballo said the individual was isolated from the larger group and was screened for the virus Wednesday afternoon before receiving clearance to leave.

To date, the Centers for Disease Control and Prevention and state health officials have confirmed 12 cases of the coronavirus in the United States, with a new case verified in Wisconsin. Six cases are in California.