TABLE 1.

Serotyping results with both serotyping assays and final results after the investigations

SerotypeaNo. of isolates identified by:Final result (no. of isolates)
Multibead assayNeufeld's test
1303030
2111
3222222
4202020
5111111
6A16b2121
6B242424
7F/A141414
8131313
9V181818
9N/L121212
10A/B/39/33C121212
11A/D/F8b109
12F/A/B161616
14525252
15B/C101010
17F666
18C2827b28
19A181818
19F262626
203c44
22F/A666
23F191919
33F/A666
NT1049797
All495495495
  • a 7F/A means that the isolate may express either 7F or 7A serotype. 10A/B/39/33C indicates that the isolate may express serotype 10A, 10B, 39, or 33C.

  • b After additional studies of Brazilian isolates, it was concluded that the multibead assay failed to identify five 6A strains (with Hyp6AM3) and one 11A strain and that Neufeld's test failed to identify one 18C strain and falsely identified one strain as 11A.

  • c One Danish strain had high background signal and was not detected during the initial multibead assay.