An outbreak of pertussis, a dangerous and highly contagious disease known to be fatal to a percentage of infants, continues in Nevada County schools. A third confirmed case of the potentially deadly disease (known as whooping cough) was reported at Yuba River Charter School in the same class as the two previous cases that emerged in early February, the Nevada County Public Health Department reported Friday. Additionally, two more confirmed cases that were traced to the original outbreak at Yuba River Charter were reported at Nevada City School for the Arts, Tex Ritter, interim director of Public Health, said in …