photo by: Associated Press

A hospital worker waits in a tent at the entrance of a drive-thru testing location for coronavirus at Lawrence Memorial Hospital in Lawrence, Kan., Tuesday, March 24, 2020. (AP Photo/Orlin Wagner)

Story updated at 3:32 p.m. Thursday

Kansas health officials announced Thursday that 13 Douglas County residents have now tested positive for COVID-19.

Amid nationwide concerns about limited testing, the state had recorded 168 positive cases of the disease, with three deaths, as of late Thursday morning. The state’s secretary of health and environment, Dr. Lee Norman, said Wednesday that he expected the number of positive tests to approach 400 by the end of March.

Of the 13 cases announced so far in Douglas County, local health officials said 11 involved people who traveled out of state or country and another involved a person who likely contracted the disease locally. The cause of transmission in the remaining case has not been determined yet, Lawrence-Douglas County Public Health said in a news release Thursday afternoon. The state noted in its update Thursday that one of Douglas County’s new cases was presumed positive by a reference lab and not yet confirmed through the Kansas Department of Health and Environment.

The 13 Douglas County cases have involved one person in their late teens, four people in their 20s, three people in their 30s, three people in their 40s, one person in their 50s and one person in their 60s, the health department said.