LOS ANGELES, United States - California health officials on Friday confirmed the second case in the United States of the new coronavirus believed to have been transmitted to a person who did not travel overseas or come in contact with anyone known to be ill.
"This new case indicates that there is evidence of community transmission but the extent is still not clear," said Sara Cody, director of public health for Santa Clara County, near San Francisco.
"What we know now is that the virus is here, present at some level, but we still don't know to what degree," she added.
The patient in the second case of community spread of the coronavirus disease 2019 is an adult woman with chronic health issues. She is being treated at a local hospital.
Cody said the woman's doctor had reached out to health officials on Wednesday evening, concerned she may have contracted the virus.
Authorities have identified dozens of people the woman had come in contact with and they were quarantined in their homes.
"An important priority... for us is to conduct public health surveillance to determine the extent of what's happening," Cody said.
The virus has infected at least 80,000 people around the world, with most cases recorded in China, where the outbreak started.