TABLE 4.

Characteristics of B. pertussis isolates by age group, post-2020

	≤36 months (n = 23)	37 months to 18 years (n = 72)	>18 years (n = 33)	Total (all ages, N = 128)
Vaccine‐antigen genotypes
ptxC1/prn1/ptxP1/fhaB2400_5550-3/tcfA2	2 (8.70%)	2 (2.78%)	0	4 (3.1%)
ptxC2/prn150/ptxP3/fhaB/2400_5550-1/tcfA2	18 (78.26%)	69 (95.83%)	33 (100%)	120 (93.8%)
ptxC2/prn150/ptxP3/fhaB-2400_5550-1/tcfA9	1 (4.35%)	0	0	1 (0.8%)
ptxC2/prn2/ptxP3/fhaB-2400_5550-1/tcfA2	2 (8.70%)	1 (1.39%)	0	3 (2.3%)
MLVA types
MT28	14 (60.87%)	38 (52.78%)	27 (81.82%)	79 (61.7%)
Others	9 (39.13%)	34 (47.22%)	6 (18.18%)	49 (38.3%)
Macrolide resistance
S	2 (8.70%)	1 (1.39%)	0 (100%)	3 (2.3%)
R	21 (91.30%)	71 (98.61%)	33 (0%)	125 (97.7%)