(KAIR)--Kansas health officials say they have identified three new cases of the coronavirus, making four cases in the state. Mary Beverly, the interim director of the Johnson County Health Department, says the cases are three men between the ages of 35 and 65 who all attended a conference in Florida. Beverly says the men did not have symptoms until after they returned from the conference and they are not seriously ill. 

Late Thursday morning, Atchison County activated the CodeRED alert system to point residents to the Atchison County website, where a press release from the Atchison County Health Department is posted.

The release confirms that there are no cases of COVID-19 in Atchison County, but says the health department “routinely investigates infectious disease and take preventative measures based on the KDHE and CDC guidance to reduce the spread of disease.”

The release reiterates such preventative measures as practicing good hygiene, avoiding face touching, and covering your mouth when coughing or sneezing.

Meanwhile, the University of Kansas, Kansas State University and Emporia State University are joining colleges across the country in shifting classes online to mitigate the spread of the new coronavirus. All three campuses are on spring break this week. The University of Kansas announced Wednesday and Kansas State and Emporia State on Thursday that they would delay the start of classes that usually meet in-person until March 23, when the classes will be taught remotely. Kansas State and Emporia State said the remote classes would continue “until further notice," while the University of Kansas said they may continue for several weeks.

The Associated Press contributed to this story.