SUPERIOR, Wis. (AP) -

Two children who attend a Douglas County child-care center have been confirmed to have pertussis, commonly known as whooping cough, and several others are undergoing testing.

WDIO-TV reports nurses from Douglas County Public Health Service have contacted parents of children who attend the center to recommend antibiotics or further evaluation. The name and location of the center were not released due to privacy concerns.

Wisconsin is experiencing a widespread outbreak of pertussis, with 3,496 confirmed and probable cases as of July 31.

Pertussis is a contagious bacterial disease affecting the respiratory tract and is spread by coughing, often through repeated face-to-face contact. The coughing can eventually get worse, interrupting breathing, sleeping and eating.