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Volume 18, Number 2—February 2012

CME ACTIVITY

Declining Guillain-Barré Syndrome after Campylobacteriosis Control, New Zealand, 1988–2010

Michael G. BakerComments to Author , Amanda Kvalsvig, Jane Zhang, Rob Lake, Ann Sears, and Nick Wilson
Author affiliations: University of Otago, Wellington, New Zealand (M.G. Baker, A. Kvalsvig, J. Zhang, A. Sears, N. Wilson); Institute of Environmental Science and Research, Christchurch, New Zealand (R. Lake)

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Table 3

Incidence of GBS after hospitalization for campylobacteriosis and other infectious diseases compared with total population incidence rate for GBS, New Zealand, July 1995–December 2008*

Initial hospitalization condition ICD-9 codes ICD-10 codes Denominator population† Subsequent GBS hospitalizations (concurrent hospitalizations)‡ Crude rate§ Age-standardized rate¶ (95% CI) Age-standardized rate ratio (95% CI)
Infectious diseases (ICD chapter 1) 001–139 A00–B99 732,254 56 (273) 90.7 87.0
(56.9–116.4) 34.3
(29.2–40.3)
Pneumonia and influenza 480–488 J09–J18 250,399 19 (82) 91.1 96.2
(25.1–167.3) 37.9
(26.5–54.3)
Enteric diseases# 001–002
004–008.42
008.44–009.3 A00–A01 A03–A04.4 A04.6–A09 77,793 6 (21) 93.3 132.0
(1.2–262.7) 52.0
(32.2–84.2
Campylobacteriosis 008.43 A04.5 8,448 5 (29) 710.2 810.0
(41.4–1,578.7) 319.4
(201.5–506.4)
Salmonellosis 003 A02 2,148 0 (0) 0 0 0
New Zealand population GBS rate NA NA 53,617,400 1,320 2.5 2.5
(2.4–2.7) Referent

*GBS, Guillain-Barré syndrome; ICD, International Classification of Diseases; ICD-9, ICD 9th Revision; ICD-10, ICD 10th Revision; NA, not applicable.
†Denominator population based on either 1) incident hospitalizations for specific condition (number of acute and arranged first overnight hospitalizations as principal or additional diagnosis); or 2) total New Zealand population person-years for July 1995– December 2008 for calculating the New Zealand population GBS rate.
‡First hospitalization of GBS either 1) among those with a previous hospitalization in the preceding 30 d and excluding those with concurrent diagnoses (numbers in parentheses); or 2) in the total New Zealand population for July 1995–December 2008.
§Rate per 100,000 person-years at risk. For GBS hospitalizations after specific conditions, monthly rate has been multiplied by 12 to convert to annual rate.
¶Standard population is population of New Zealand according to the New Zealand 2006 Census of Population and Dwellings (www.stats.govt.nz/Census/2006CensusHomePage/classification-counts-tables/about-people/age.aspx).
#Excluding campylobacteriosis and salmonellosis.

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