Health officials suspect swine flu has sickened at least 30 children in a Texas church's youth choir group on a bus trip in Colorado.

The Dallas Morning News reports that Colorado health officials suspect one or more choir members of the Grace Presbyterian Church in Plano contracted the virus in Texas before the eight-day trip began last Friday.

Health officials in El Paso County, Colo., were testing the children for H1N1 influenza.

None of the children, who were complaining of shortness of breath, fevers and excessive coughing, have been hospitalized.

At least 70 children went on the trip. Some of the healthy children have returned to Plano and the rest of the trip has been canceled.