The NY Health Department is investigating a cluster of illness at the St. Francis Preparatory School in Queens, where 100 students missed classes because of flu-like illness last week. The Centers for Disease Control and Prevention today confirmed swine flu in an additional 20 people associated with the St. Francis Preparatory School. All of the patients suffered only minor illness. None required hospitalization, and nearly all are improving. The total number of cases in New York City now stands at 28. The Health Department has also identified 17 more probable cases within the St. Francis school cluster