Table 2.
Strain characteristics of S. aureus strains isolated from pediatric persistent carriers.
| Pediatric Persistent Carrier* | Antibiotic Resistance of Carriage Isolate(s) | Ridom spa Type 1st Nasal Swab† | Ridom spa Type 2nd Nasal Swab | Ridom spa Type 3rd Nasal Swab |
|---|---|---|---|---|
| P1 | MSSA‡ | t1077/ t1077 | t1077/ t1077 | t1077/ t1077 |
| P2 | MSSA | New32/New32** | New32/New32 | NEG¥/t008 |
| P3 | MSSA | NEG/t9964 | NEG/t9964 | t9964/t9964 |
| P4 | MSSA | NEG/t13031 | t13031/t13031 | t13031/t13031 |
| P5 | MSSA | t338/t338 | t338/t338 | t338/t338 |
| P6 | Both MSSA | t002/t002 | t620/NEG | t620/t620 |
| PC7 | MSSA | t164/t164 | t164/t164 | t164/t164 |
| PC8 | MSSA | t164/t164 | t164/t164 | t164/t164 |
| PC9 | MSSA | t165/t165 | t165/t165 | t165/t165 |
| PC10 | MRSA§ and MSSA, respectively | t008/t008 | t008/t008 | NEG/t1978 |
| PC11 | MRSA | t1978/t1978 | t1978/t1978 | t1978/t1978 |
| PC12 | MRSA | t008/t008 | t008/t008 | t008/NEG |
Persistent carriage is defined by the identification of S. aureus at each sampling time point.
At each sampling time point swabs were used to inoculate MSA plates. The swab tips were cultured in TSB for 48 h and then used to inoculate a second MSA plates. Therefore, for each collection time point, an individual could have two S. aureus colonies available for analysis. S. aureus spa type in bold designates the spa type identified at the time of the last nasal sampling and also the isolate used to stimulate respective persistent carriers and in the generation of the Carrier Mix.
MSSA, methicillin susceptible S. aureus
This provisional new spa type with the following repeats: r07-r23-r12-r21-r12-r17-r20-r17-r12-r12-r24
NEG, S. aureus not detected.
MRSA, methicillin resistant S. aureus