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Study A: A placebo-controlled crossover study to assess safety of intranasal administration of palivizumab
Study B: Effect of intranasal administration of palivizumab on respiratory syncytial virus-associated infection - a double-blind randomized controlled trial

Study A: Safety of intranasal administration of palivizumab in healthy adultsStudy B: Effect of local administration of palivizumab on prevention of RSV infection

A Randomized, Double-blind, Placebo-controlled Phase 2a Study to Evaluate a Range of
Dose Levels and Vaccination Intervals of Ad26.COV2.S in Healthy Adults Aged 18 to 55
Years Inclusive and Adults Aged 65 Years and Older and to Evaluate 2 Dose Levels of Ad26.COV2.S in Healthy Adolescents Aged 12 to 17 Years Inclusive

The primary purpose of this study is to assess humoral immune responses of 3 dose levels of Ad26.COV2.S administered intramuscularly (IM) as a 2-dose schedule (56 days apart); Ad26.COV2.S administered IM as a single vaccination; safety and…