Table 3.

Serotype switching in the 2007 dataset detected by comparison with the MLST database.

Sequence type	Current serotype	Expected serotype	Notes
320 (1451)	19A	19F	See [5]. 1451 is a single locus variant of ST320
695	19A	4	see [5, 27]
162 (3275)	15B/C	9V	SLV (and DLV) of ST 156 (Spain 9V-3 clone) [20] see [24]
1925	19A	9V	SLV of ST 156 (Spain 9V-3 clone) PMEN [20]
338	23A	23F	Columbia 23F-26 clone [25]

The ST/serotype combinations shown above have been previously recorded in MA, in carriage or disease, but based on the records in the MLST database are apparent cases of serotype switching from vaccine serotypes. Serotype/ST combinations which have not been previously reported in the MLST database are underlined. SLV and DLV respectively refer to single and double locus variants in eBURST analysis [15]