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A short report on highlights of worldwide development of RIX4414: a Singaporean experience

K B Phua1, S H Quak, S Emmanuel

  • 1Department of Pediatrics, KK Women's and Children's Hospital, 100 Bukit Timah Road, Singapore 229899, Singapore. kbphua@kkh.com.sg

Vaccine
|April 8, 2006
PubMed

Insights

This study found that the RIX4414 rotavirus vaccine was safe and effective in Singaporean infants. High rates of seroconversion and

Area of Science:

  • Pediatric infectious diseases
  • Vaccinology
  • Immunology

Background:

  • Rotavirus is a leading cause of severe diarrheal disease in infants globally.
  • Effective rotavirus vaccines are crucial for public health interventions.
  • Previous studies have explored various rotavirus vaccine candidates.

Purpose of the Study:

  • To evaluate the safety and immunogenicity of an attenuated human rotavirus vaccine (RIX4414) in a dose-ranging study.
  • To determine the optimal dose of RIX4414 for infants in Singapore.
  • To assess the vaccine's tolerability and interference with routine immunizations.

Main Methods:

  • Phase II, randomized, double-blind, placebo-controlled, dose-ranging study.
  • 2464 healthy infants received two oral doses of RIX4414 (three dose levels) or placebo.
  • Vaccinations were administered at 3 and 4 months of age alongside routine immunizations.
  • Seroconversion and 'vaccine take' were assessed 1 month post-dose 2.

Main Results:

  • Seroconversion rates ranged from 76% to 91% across vaccine groups.
  • 'Vaccine take' was observed in 98% to 100% of vaccine recipients.
  • The vaccine was well tolerated with no significant adverse events reported.
  • Concomitant administration with routine vaccines did not affect immune responses.

Conclusions:

  • Attenuated human rotavirus vaccine RIX4414 demonstrated favorable safety and immunogenicity in Singaporean infants.
  • The vaccine achieved high seroconversion and 'vaccine take' rates.
  • RIX4414 can be safely co-administered with routine infant immunizations.

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