The research study aims to check the safety of an investigational vaccine for meningococcal disease. The study is for healthy **infants and toddlers** aged 60 to 89 days (about 2 months old) in Russia and Mexico. The duration of the study is about **12 months** with multiple visits to the clinic. **Key Points:** - Participants must be healthy infants, born full-term, with a birth weight of at least 2.5 kg. - Participants should not have received certain vaccines or treatments recently. - The parents must be able to attend all visits and follow the study rules. This study is not for babies who have certain health conditions or have taken specific medications. If your child meets the criteria and you are interested, you will need to sign a consent form and be able to attend all study visits.
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