Abstract:
:Rhesus-human rotavirus reassortants incorporating the gene expressing the VP7 surface protein of human rotavirus serotypes 1 or 2, and the remaining ten genes from rhesus rotavirus (RRV) were evaluated as candidate oral vaccines in 2-4-month-old infants. A single dose of the serotype 1 reassortant vaccine which had a titre of 10(4) plaque-forming units (p.f.u.) induced a fourfold or greater antibody response in 81% of the recipients by a combination of ELISA and neutralization assays; 51% of the vaccinees developed a neutralizing antibody response to the vaccine strain. A single dose of the serotype 2 vaccine (10(4) p.f.u.) induced a seroresponse in all vaccinees by the combination of assays whereas 67% developed neutralizing antibodies to the vaccine strain. A combination of these two vaccines (0.5 x 10(4) p.f.u. of each) induced an overall seroresponse in 95% of the recipients but only 48% and 24% response in neutralizing antibodies to serotypes 1 and 2, respectively. A trivalent combination which included the two reassortants and RRV (0.33 x 10(4) p.f.u. of each strain) induced an overall response in 82% of the vaccinees, but only 30%, 20% and 65% developed a neutralizing antibody response to serotype 1, serotype 2, and RRV, respectively. Febrile reactions on days 2-5 after vaccination were seen in 23-45% of the infants receiving the various vaccines and combinations and in 5% of the placebo group. It is concluded that rhesus-human reassortant rotaviruses may be combined with each other and with RRV as a polyvalent vaccine, but the VP7-specific neutralizing antibody responses are likely to be lower after combined vaccination than following vaccination with a single reassortant rotavirus.
journal_name
Vaccinejournal_title
Vaccineauthors
Vesikari T,Varis T,Green K,Flores J,Kapikian AZdoi
10.1016/0264-410x(91)90060-jsubject
Has Abstractpub_date
1991-05-01 00:00:00pages
334-9issue
5eissn
0264-410Xissn
1873-2518pii
0264-410X(91)90060-Jjournal_volume
9pub_type
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