The Guillain-Barre syndrome and the 1993 and 1993-1994 influenza vaccines

Citation
T. Lasky et al., The Guillain-Barre syndrome and the 1993 and 1993-1994 influenza vaccines, N ENG J MED, 339(25), 1998, pp. 1797-1802
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
General & Internal Medicine","Medical Research General Topics
Journal title
NEW ENGLAND JOURNAL OF MEDICINE
ISSN journal
0028-4793 → ACNP
Volume
339
Issue
25
Year of publication
1998
Pages
1797 - 1802
Database
ISI
SICI code
0028-4793(199812)339:25<1797:TGSAT1>2.0.ZU;2-3
Abstract
Background The number of reports of influenza-vaccine-associated Guillain-B arre syndrome to the national Vaccine Adverse Event Reporting System increa sed from 37 in 1992-1993 to 74 in 1993-1994, arousing concern about a possi ble increase in vaccine-associated risk. Methods Patients given a diagnosis of the Guillain-Barre syndrome in the 19 92-1993 and 1993-1994 influenza-vaccination seasons were identified in the hospital-discharge data bases of four states. Vaccination histories were ob tained by telephone interviews during 1995-1996 and were confirmed by the v accine providers. Disease with an onset within six weeks after vaccination was defined as vaccine-associated. Vaccine coverage in the population was m easured through a random-digit-dialing telephone survey. Results We interviewed 180 of 273 adults with the Guillain-Barre syndrome; 15 declined to participate, and the remaining 78 could not be contacted. Th e vaccine providers confirmed influenza vaccination in the six weeks before the onset of Guillain-Barre syndrome for 19 patients. The relative risk of the Guillain-Barre syndrome associated with vaccination, adjusted for age, sex, and vaccine season, was 1.7 (95 percent confidence interval, 1.0 to 2 .8; P=0.04). The adjusted relative risks were 2.0 for the 1992-1993 season (95 percent confidence interval, 1.0 to 4.3) and 1.5 for the 1993-1994 seas on (95 percent confidence interval, 0.8 to 2.9). In 9 of the 19 vaccine-ass ociated cases, the onset was in the second week after vaccination, all betw een day 9 and day 12. Conclusions There was no increase in the risk of vaccine-associated Guillai n-Barre syndrome from 1992-1993 to 1993-1994. For the two seasons combined, the adjusted relative risk of 1.7 suggests slightly more than one addition al case of Guillain-Barre syndrome per million persons vaccinated against i nfluenza. (N Engl J Med 1998;339:1797-802.) (C) 1998, Massachusetts Medical Society.