Abstract:
:Hepatitis A and B are common infections worldwide and their severity is related to the individual's age upon initial infection. Furthermore, when hepatitis B infection occurs in infants, the risk of becoming a chronic carrier is 90%. For hepatitis A, the lower incidence of disease arising from an improvement in living conditions leaves a greater number of children, adolescents and young adults susceptible to residual circulating virus. Consequently, initial infection occurs later in life when clinical illness is more frequent and the rate of morbidity and mortality higher. Although both viruses differ greatly, including their modes of transmission, the overlap in their epidemiology warrants the combination of hepatitis A and B vaccination. The immune response elicited by the combined hepatitis A and B vaccine following a three-dose schedule compares well with the anti-hepatitis A virus (HAV) and anti-hepatitis B sero-responses obtained with monovalent vaccines. In addition, it was shown that the seroprotection rate for anti-hepatitis B increased more rapidly with the administration of the combined vaccine, with values of more than 80% within 1 month after the first two doses (schedule, 0, 1 and 6 months). Currently, according to the World Health Organization recommendations, more than 116 countries are vaccinating their infants and/or adolescents against hepatitis B. Recently, several countries were considering or have decided to begin mass vaccination against HAV (more than fifteen states in the US, Spain (Catalonia), Italy (Puglia)). For these countries, the combination of hepatitis A and B antigens in one single vaccine offers the following advantages: fewer injections for protection against two infections, better compliance, lower implementation costs, and fewer missed vaccination opportunities. Further simplification of the schedule, by reducing the number of doses, would improve the compliance rate as well as being more convenient for the vaccinee. This should translate into a reduction in costs associated with vaccine administration. In some recent vaccine studies, the immunogenicity and safety profile of a two-dose schedule (0 and 6 months) of the adult formulation of the combined hepatitis A and B vaccine was investigated in children aged 1-11 years, as well as in adolescents aged 12-15 years. Current results indicate that this two-dose schedule of the adult formulation could be considered a viable alternative for immunization of children and adolescents.
journal_name
Vaccinejournal_title
Vaccineauthors
Van Damme P,Van der Wielen Mdoi
10.1016/s0264-410x(00)00464-3subject
Has Abstractpub_date
2001-03-21 00:00:00pages
2407-12issue
17-19eissn
0264-410Xissn
1873-2518pii
S0264410X00004643journal_volume
19pub_type
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