DES MOINES — The number of positive cases of COVID-19 has grown by another 19 in Iowa, bringing the state total to 124 confirmed cases, Gov. Kim Reynolds said Tuesday.

The latest report includes cases in Jasper County and Warren County in central Iowa. That means 30 counties in Iowa have positive cases.

For most people, COVID-19 causes only mild or moderate symptoms, such as fever and cough. For some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia.

The largest concentration of cases continues to be in Johnson County in eastern Iowa, where 37 cases are confirmed. Polk County in central Iowa has the second-highest number with 17 cases.

State data shows 70 women have tested positive and 54 men. People aged 61 to 80 are the largest group affected with 61 cases, nearly half of the positive cases, in that age group.

Reynolds said Monday that voluntary social distancing is adequate to manage the spread in Iowa so far.

She planned to release additional information in an afternoon news conference.