Source Domestic Students S. aureus InternationalStudentsS. aureus Total Nasal 13 21 34 Pharyngeal 11 11 22 Both 15 7 22 Totals 39 39 78

Table 1: Presence of S. aureus in the pharyngeal or nasal passages of tested students. Detection was indicated as “nasal”, “pharyngeal” or “both” to demonstrate that testing of only one passage could result in missing the accurate carrier status of the student. Testing only the nasal passage would have resulted in missing 22 isolates. Testing only the pharyngeal passage would have resulted in missing 34 isolates. Only 22 students were positive in both passageways.