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Archives of Virology

, Volume 141, Issue 11, pp 2057–2076 | Cite as

Divergence of VP7 genes of G1 rotaviruses isolated from infants vaccinated with reassortant rhesus rotaviruses

  • Q. Jin
  • R. L. Ward
  • D. R. Knowlton
  • Y. B. Gabbay
  • A. C. Linhares
  • R. Rappaport
  • P. A. Woods
  • R. I. Glass
  • J. R. Gentsch
Original Papers

Summary

A large placebo-controlled efficacy trial of the rhesus tetravalent (RRV-TV) and serotype G1 monovalent (RRV-S1) rotavirus vaccines was conducted in 1991–1992 at 24 sites across the United States. Protection was 49% and 54% against all diarrhea but 80% and 69% against very severe gastroenteritis for the two vaccines, respectively. Post-vaccination neutralizing antibody titers to the G1 Wa strain, whose VP7 protein is nearly identical to that of the D strain of rotavirus contained in both vaccines, did not correlate with protection against subsequent illness with G1 strains. This result raised the possibility that in infants who developed post-vaccination neutralizing antibody to Wa, breakthrough (i.e., vaccine failure—the occurrence of rotavirus diarrhea after immunization) may have been due to infection by G1 strains that were sufficiently antigenically distinct from the vaccine strain to evade the neutralizing antibodies elicited by vaccination. To test this hypothesis, we initially compared post-vaccination neutralizing antibody titers of vaccinees against Wa and G1 breakthrough strains using sera from subjects who experienced breakthrough. Post-immunization neutralizing antibody titers to Wa elicited by vaccination were significantly (P<0.001) greater than to the breakthrough strains subsequently obtained from these subjects. This difference did not, however, correlate with lack of protection since similar differences in titer to Wa and breakthrough strains were found using post-vaccination sera from vaccinees who either experienced asymptomatic rotavirus infections or no infections. To determine the genetic basis for these differences, we compared the VP7 gene sequences of Wa with vaccine strain D, 12 G1 breakthrough strains, and 3 G1 control strains isolated during the same trial from placebo recipients. All breakthrough strains were distinct from Wa and D in antigenically important regions throughout the VP7 protein, but these differences were conserved between breakthrough and placebo strains. Furthermore, a comparative analysis of the deduced amino sequences from VP7 genes of G1 rotaviruses from 12 countries indicated that four distinct lineages have evolved. All breakthrough and control strains from the U.S. vaccine trial were in a lineage different from strain D, the serotype G1 vaccine strain. Although the overall results do not support our original hypothesis that immune selection of antigenically distinct escape mutants led to vaccine breakthrough in subjects with a neutralization response to Wa, it cannot be excluded that breakthrough could be partially due to antigenic differences in the VP7 proteins of currently circulating G1 strains.

Keywords

Vaccine Strain Neutralize Antibody Titer Breakthrough Strain Vaccine Breakthrough Deduce Amino Sequence 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • Q. Jin
    • 1
    • 2
  • R. L. Ward
    • 3
  • D. R. Knowlton
    • 3
  • Y. B. Gabbay
    • 4
  • A. C. Linhares
    • 4
  • R. Rappaport
    • 5
  • P. A. Woods
    • 1
  • R. I. Glass
    • 1
  • J. R. Gentsch
    • 1
  1. 1.Viral Gastroenteritis Section, Division of Viral and Rickettsial DiseasesNational Center for Infectious Diseases, Centers for Disease Control and PreventionAtlantaUSA
  2. 2.National Laboratory of Molecular Virology and Genetic EngineeringInstitute of Virology, Chinese Academy of Preventive MedicineBeijingPeople's Republic of China
  3. 3.Division of Infectious DiseasesChildren's Hospital Medical CenterCincinnatiUSA
  4. 4.Virology SectionInstituto Evandro ChagasParaBrazil
  5. 5.Wyeth-Ayerst ResearchBiotechnology and Microbiology Division, RadnorPennsylvaniaUSA

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