TABLE 2.

M type and numbers of isolates collected from various sites according to year

Antigen and site(s)No. of strains serotyped in:Total no. of strains serotyped
1993199419951996199719981999
M1
    Blood, brain, and CSF39518865101135140619
    Miscellaneous393778387410669441
    Throat95325919916149
    Unidentified5222573448
M28
    Blood, brain, and CSF592438394344202
    Miscellaneous691421323839159
    Throat3191626138
    Unidentified4131927
M12
    Blood, brain, and CSF7153731293443196
    Miscellaneous1891623252619136
    Throat15123832893117
    Unidentified2322716
M3
    Blood, brain, and CSF61970457727181
    Miscellaneous392120121371
    Throat2840122266
    Unidentified53210
M4
    Blood, brain, and CSF11132122211718123
    Miscellaneous105161016121180
    Throat742120519177
    Unidentified2813115
M11
    Blood, brain, and CSF3721192527102
    Miscellaneous1131428251486
    Throat143101735
    Unidentified2327
M89(PT4245)
    Blood, brain, and CSF6262018172493
    Miscellaneous3399111449
    Throat3126
    Unidentified11
M6
    Blood, brain, and CSF32241944662
    Miscellaneous53191154249
    Throat1243129
    Unidentified2125
M2
    Blood, brain, and CSF163899844
    Miscellaneous3289513747
    Throat4151012326
    Unidentified1315
M77
    Blood, brain, and CSF11346121239
    Miscellaneous143212628
    Throat632314
    Unidentified2158
M75
    Blood, brain, and CSF1271631535
    Miscellaneous256683131
    Throat325
    Unidentified11
M49
    Blood, brain, and CSF231557932
    Miscellaneous164414222
    Throat123
    Unidentified2114
M22
    Blood, brain, and CSF322549530
    Miscellaneous228435226
    Throat82111
    Unidentified112
M61
    Blood, brain, and CSF2591118
    Miscellaneous1167116
    Throat123
    Unidentified
M73
    Blood, brain, and CSF4212211
    Miscellaneous11
    Throat11
    Unidentified11
M87 (PT2841)
    Blood, brain, and CSF21313111
    Miscellaneous11
    Throat123
    Unidentified
M5
    Blood, brain, and CSF12710
    Miscellaneous111159
    Throat11
    Unidentified
M33
    Blood, brain, and CSF24129
    Miscellaneous23112211
    Throat11
    Unidentified
M29
    Blood, brain, and CSF32319
    Miscellaneous325111
    Throat
    Unidentified
Other M types
    Blood, brain, and CSF378614102573
    Miscellaneous559167172079
    Throat25712127
    Unidentified12238
M nontypeable
    Blood, brain, and CSF43274141465245295
    Miscellaneous40225536434539280
    Throat122846261332148
    Unidentified11223211
        Total3483709188176678437974,760