Last week, 13 elementary and middle school students in Smithtown came down with pertussis, which is the medical name for whooping cough.
Suffolk County officials confirmed that a 7-week-old baby died back in April from pertussis.
Whooping cough is highly contagious.
Officials are urging parents to make sure their children's immunizations are up to date.
Parents and physicians who have questions about pertussis may contact the Suffolk County Department of Health Services' Division of Public Health at 631-853-3055.