Safety and Immunogenicity of a High-Potency Inactivated Hepatitis A Vaccine.

Abstract:

:Background: In recent years, several hepatitis A vaccines have been developed. We wished to evaluate the safety, reactogenicity, and immunogenicity of an inactivated hepatitis A vaccine, containing 1440 EI.U., and to monitor the kinetics of the antibodies monthly for the first year after administration of a single dose of vaccine. Methods: We conducted an open clinical trial, started in March 1992 and completed in July 1993, at two general hospitals and one pediatric hospital in Antwerp, Belgium, with 194 healthy adult healthcare volunteers. Each volunteer received a single dose hepatitis A vaccine, given intramuscularly at month 0 and a booster at month 12. We undertook serologic follow-up of antihepatitis A virus (antiHAV) antibodies and liver enzymes at day 15 and at months 1, 6, 9, 12, and 13. For a random subgroup of participants, blood samples were taken monthly. In addition, all participants noted local and general symptoms following administration of the vaccine. Results: This single dose vaccine was well-tolerated; 2 weeks after the vaccination, 80% of the participants had seroconverted (antiHAV antibodies >=20 mIU/mL); after 1 month, seroconversion reached 99% (geometric mean titer (GMT): 383 mIU/mL). One year after the single dose of vaccine, 94% still had antiHAV antibodies above 20 mIU/mL (GMT: 176 mIU/mL). One month after the booster dose, seroconversion was 100%, and GMT increased from 176 mIU/mL at month 12 to 4775 mIU/mL at month 13. Conclusions: The single dose hepatitis A vaccine is safe and highly immunogenic; it gives a rapid antibody production and a rapid increase of GMT. The persistence of protective antibodies until month 12 allows a booster at month 12. This schedule will easily fit into existing travel or occupational health vaccination schedules and will improve vaccination compliance.

journal_name

J Travel Med

authors

Van Damme P,Thoelen S,Cramm M,Meheus A

doi

10.1111/j.1708-8305.1996.tb00711.x

subject

Has Abstract

pub_date

1996-06-01 00:00:00

pages

83-90

issue

2

eissn

1195-1982

issn

1708-8305

journal_volume

3

pub_type

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