AUSTIN, Texas (CBSDFW.COM/AP) – The death toll from the coronavirus in Texas surpassed the 15,000 mark Wednesday as the total number of deaths across the U.S. topped 200,000, the highest in the world.

The Texas Department of State Health Services reported 2,977 newly confirmed coronavirus cases and 135 more deaths due to COVID-19.

READ MORE: Texas Teachers Are Making Surprise, In-Person Visits To Students Struggling With Online Learning

(credit: Texas Dept. of State Health Services)

Health officials say there have been 719,252 confirmed cases in Texas so far.

The death toll stands at 15,129.

Dallas County Reports 346 New Coronavirus Cases, 2 Deaths

READ MORE: 'The Right Thing To Do,' Lt. Gov. Dan Patrick Requests ERCOT To Rectify $16 Billion Error During Storm

The true number of cases is likely higher though because many people haven’t been tested and studies suggest people can be infected and not feel sick.

For most people, the coronavirus causes mild or moderate symptoms, such as fever and a cough that clear up in two to three weeks.

For some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia, and death.

MORE NEWS: CDC Issues First Set of Guidelines On How Fully Vaccinated People Can Visit Safely with Others

(© Copyright 2020 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)