Volume 23, Number 1—January 2017
Dispatch
Increased Invasive Pneumococcal Disease, North East England, UK
Table 2
Serotype group, serotype | IRR (95% CI)† | p value† |
---|---|---|
PPV23–13 | ||
8 | 1.18 (1.08–1.29) | <0.001 |
9N | 1.19 (1.04–1.36) | 0.009 |
10A | 1.07 (0.89–1.29) | 0.465 |
11A | 1.03 (0.92–1.15) | 0.617 |
12F | 1.28 (1.20–1.36) | <0.001 |
15B/C‡ | 1.29 (0.99–1.69) | 0.061 |
17F | 0.84 (0.65–1.09) | 0.188 |
20 | 1.12 (0.96–1.31) | 0.148 |
22F | 1.04 (0.95–1.13) | 0.421 |
33F |
1.17 (1.00–1.38) |
0.051 |
NVT§ | ||
6C | 1.00 (0.91–1.10) | 0.958 |
15A | 1.13 (1.07–1.19) | <0.001 |
16F | 0.99 (0.85–1.15) | 0.924 |
23A | 1.15 (1.06–1.24) | <0.001 |
23B | 1.06 (0.81–1.40) | 0.657 |
24F | 1.03 (0.91–1.17) | 0.645 |
31 | 1.03 (0.92–1.16) | 0.591 |
35B | 1.12 (0.92–1.37) | 0.256 |
35F | 1.23 (1.06–1.44) | 0.008 |
38 | 0.84 (0.61–1.15) | 0.279 |
*Boldface indicates significance. IRR, incidence rate ratio; PPV23–13, 23–valent pneumococcal polysaccharide vaccine serotype cases, excluding those also contained in the 13–valent pneumococcal conjugate vaccine; NVT, nonvaccine type serotype cases.
†Increase in IRR per calendar quarter, estimated by using negative binomial regression, with counts per calendar quarter (from April 1–June 30, 2013 (Quarter 2) to January 1–March 31, 2016 (Quarter 1), robust standard errors and offset with the natural logarithm of the North East England population (10).
‡Includes 15B and 15B/C but excludes 15C serotypes as determined by the Public Health England Respiratory and Vaccine Preventable Bacteria Reference Unit.
§NVT serotypes reported more than once in the epidemiologic year 2015–2016.
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1These authors were co-principal investigators.