COLUMBIA, SC (WSPA) – The South Carolina Department of Health and Environmental announced during a news conference Friday afternoon four additional deaths related to COVID-19, bringing the state’s total to 13.

According to DHEC, the patients — who were all elderly and had underlying health conditions — were from Richland, Kershaw, Greenville and Florence counties.

DHEC also said they are investigating 86 additional cases of COVID-19.

“Three previously reported cases were determined during case investigations to be residents of other states,” according to DHEC’s news release. “This brings the total number statewide to 539 cases in 39 counties.”

Dr. Linda Bell said during the news conference Friday that the public health lab is working through a backlog of 1,800 samples to test.

New cases by county:

Aiken County: 2

Beaufort County: 6

Berkeley County: 2

Charleston County: 32

Chesterfield County: 1

Clarendon County: 1

Colleton County: 1

Dorchester County: 5

Florence County: 6

Horry County: 3

Kershaw County: 6

Lancaster County: 1

Lexington County: 5

Oconee County: 1

Orangeburg County: 1

Pickens County: 1

Richland County: 5

Spartanburg County: 7

Total cases by county: