The Los Angeles County Department of Public Health (LACDPH) announced that a screener working at the airport’s quarantine facility was diagnosed with the virus. A screener working at the same facility was found to be infected on Tuesday and the two cases are believed to be related. Los Angeles county reports 13 total cases so far, out of at least 69 in California.

“We will continue to see more cases of COVID-19,” said LACDPH Director Barbara Ferrer in a press release. “We continue to urge everyone to do their part: stay home if you are sick and keep your children home if they are sick; take time now to plan for the possibility of school and business closures, and be sure to follow any additional directives issued by Public Health and/or local officials.”

Officials say the screeners were likely exposed by an infected traveler, but have asked for assistance from the Centers for Disease Control and Prevention in investigating the cases. Both workers are currently in isolation.

Newsweek reached out to LACDPH for additional information but did not receive a response in time for publication.

U.S. COVID-19 cases have been multiplying quickly. An additional 89 cases were reported Friday, making the latest official domestic total 310 in at least 25 states. At least 15 people in the country have died from the virus, while another 15 people have recovered.

Experts warn that the U.S. total is likely to continue to rise for the foreseeable future, especially as testing becomes more widely available. Federal officials planned to ship at least one million test kits to states by the end of the week but have fallen well short of the mark so far. Fewer than 2,000 people have been verifiably tested in the U.S., according to a Friday report in The Atlantic.

Just over 102,000 cases have been reported globally, with over 3,600 new cases on Friday. Deaths number close to 3,500, while at least 57,600 people have recovered.

The World Health Organization estimates that the mortality rate for COVID-19 is 3.4 percent, far higher than more common viral infections like the seasonal flu.

President Donald Trump disagreed with the mortality rate provided by experts, telling Fox News’ Sean Hannity that he had a “hunch” the real number was under one percent Wednesday. The president and his administration have been under fire for their handling of the ongoing health crisis, but Trump signed a bill Friday morning to provide $8.3 billion in emergency funding to combat the virus.