Immunogenicity and Safety of Japanese Encephalitis Vaccine When Given With Measles-Mumps-Rubella (MMR) Vaccine

Inclusion Criteria: * Age 9 months to \< 10 months at the time of enrollment. * Residence in the study area. * At least one parent or guardian willing to provide written informed consent. * Generally healthy and free of obvious health problems as established by medical history, physical examination, and clinical judgment. * A parent or guardian is willing to attend all planned study visits and allow home visits and phone contacts, as required by the protocol. Exclusion Criteria: * Previous receipt of any measles-mumps-rubella containing vaccine. * Previous receipt of any Japanese encephalitis vaccine. * History of measles, mumps, rubella, or Japanese encephalitis infection. * Administration of any other vaccine within 28 days prior to administration of a study vaccine or planned vaccination of any vaccine other than catch-up doses of routine EPI vaccines or oral polio vaccine during the 28 days after study vaccination. * History of allergic disease or known hypersensitivity to any component of the study vaccines and/or following administration of vaccines included in the local program of immunization. * Use of any investigational or non-registered drug within 90 days prior to the administration of study vaccines or planned administration during the study period. * Administration of immunoglobulins and/or any blood products within 90 days prior to the administration of study vaccines or planned administration during the study period. * Chronic administration (defined as \> …