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Volume 12, Number 10—October 2006

Research

Campylobacter jejuni Multilocus Sequence Types in Humans, Northwest England, 2003–2004

Will Sopwith*Comments to Author , Andrew Birtles†, Margaret Matthews†, Andrew Fox†, Steven Gee‡, Michael Painter*, Martyn Regan*, Qutub Syed*, and Eric Bolton†
Author affiliations: *Health Protection Agency (North West), Liverpool, United Kingdom; †Regional Health Protection Agency Laboratory, Manchester, United Kingdom; ‡Cumbria and Lancashire Health Protection Unit, Preston, United Kingdom

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Table 3

Comparative age distributions of the most common MLST clonal complexes by study area (first year of the study)*

Clonal complex Age group Isolates
Incidence/100,000
Incidence ratio 95% confidence intervals p value
Rural Suburban Rural Suburban
ST–21 0–14 2 14 6.65 17.68 0.38 0.04–1.64
15–34 9 24 24.27 21.02 1.15 0.47–2.57
35–54 12 18 24.38 15.14 1.61 0.71–3.53
>55 13 13 20.17 11.43 1.76 0.75–4.13
ST–45 0–14 3 1 9.97 1.26 7.89 0.63–414.40
15–34 1 4 2.70 3.50 0.77 0.02–7.78
35–54 7 6 14.22 5.05 2.82 0.81–10.15
>55 10 3 15.51 2.64 5.88 1.51–33.24 <0.01
ST–257 0–14 2 1 6.65 1.26 5.26 0.27–310.48
15–34 1 8 2.70 7.01 0.38 0.01–2.87
35–54 3 8 6.09 6.73 0.91 0.15–3.77
>55 4 4 6.21 3.52 1.76 0.33–9.47
ST–443 0–14 1 0 3.32 0.00
15–34 3 5 8.09 4.38 1.85 0.29–9.50
35–54 0 6 0.00 5.05
>55 1 6 1.55 5.28 0.29 0.01–2.42
ST–48 0–14 1 2 3.32 2.53 1.32 0.02–25.27
15–34 5 7 13.48 6.13 2.20 0.55–8.05
35–54 0 4 0.00 3.36
>55 1 2 1.55 1.76 0.88 0.01–16.94
ST–206 0–14 0 0 0.00 0.00
15–34 1 6 2.70 5.26 0.51 0.01–4.23
35–54 5 5 10.16 4.21 2.42 0.56–10.49
>55 2 1 3.10 0.88 3.53 0.18–208.11
All cases 0–14 19 29 63.13 36.62 1.72 0.91–3.18
15–34 48 87 129.45 76.20 1.70 1.17–2.44 <0.01
35–54 54 87 109.71 73.18 1.50 1.05–2.13 0.02
>55 57 66 88.43 58.05 1.52 1.05–2.20 0.02

*Including all cases of campylobacteriosis reported for which age was available. Annual estimated incidences in 4 age groups were calculated for each clonal complex using estimates of the age-specific annual population for each local authority. Incidence ratios were calculated for rural incidence/suburban incidence and 95% confidence intervals calculated. Those data with a statistically significant difference between the study areas are shown in boldface type (level of significance p<0.05). MLST, multilocus sequence typing.

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