A second confirmed case of measles has been identified in Collin County as of March 18.

As of March 19, this case has not yet been reported to the Texas Department of State Health Services but would be considered the 12th confirmed measles case in Texas this year, said Chris Van Deusen, director of DSHS media relations.

The DSHS has confirmed 11 cases of measles this year as of March 8. Two of these cases came from Denton and Collin counties, which each had one case at the time.

This year, Texas has seen the highest number of confirmed measles cases since 2013, according to DSHS data.

The recently identified individual spent an hour March 15, while contagious, at Kroger Marketplace in Prosper, located at 1250 N. Preston Road, according to a county news statement. The individual was there between 9-10 a.m.

Those who suspect they came into contact with this person should monitor themselves for measles symptoms for 21 days, the statement said.

Measles is a highly contagious respiratory infection that is transferred to other persons through airborne droplets spread through coughing and sneezing. These droplets may remain in the air for up to two hours after an infected person has left an area, the news statement said.

Anyone exhibiting signs of measles should contact a health care provider immediately, the statement said. Symptoms include a red rash that starts as spots on the face and moves down the body, a fever over 101 degrees, a cough, runny nose and irritated eyes.

Collin County is encouraging those who suspect they are infected with measles to call and inform their health care providers before arriving for treatment so that arrangements can be made to prevent further spread of the disease, the statement said.

In the statement, Dr. Jawaid Asghar, Collin County Health Care Services' chief epidemiologist, said residents should talk with their doctors about the benefits of immunization and get vaccinated if eligible.