The goal of this clinical trial is to evaluate the protective efficacy of S. Flexneri-S. Sonnei bivalent conjugate vaccine against diarrhea caused by Shigella infection in infants and children aged 6 months to 5 years. Researchers will observe the incidence of diarrhea of any severity due to Shigella flexneri and Shigella sonnei infection 30 days after full immunization. The subjects will receive 2 doses of vaccination.
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The protective efficacy of S. Flexneri-S. Sonnei bivalent conjugate vaccine
Timeframe: From day 30 post full immunization to the subsequent 24-month period.