TABLE 2.

Longitudinal nasopharyngeal carriage of Neisseria meningitidis in students

Student no.Meningococcal colonization detected at sampling time pointa
Week 0Week 3Week 18Week 31
5GGDid not attendDid not attend
9Did not attendC
10+
11+
12+bF
15BB, E
17HH
19+Did not attendDid not attend
20+
26+b
28DDid not attendDid not attend
29KKK
30+cBBB
33JJJDid not attend
37AAA
38AA
39IIDid not attend
100+
  • a Nasopharyngeal colonization of meningococci in the student population was determined by culture and PCR of throat swabs and gargle specimens; nine carriers were detected by both culture and PCR, six were detected only by PCR, and three were detected only by culture. The characteristics of the carried strains (A to K) refer to the phenotypes designated in Table 1. +, positive PCR test result but culture negative; −, carriage not detected.

  • b siaD PCR-detected group C-associated DNA.

  • c siaD PCR-detected group B-associated DNA.