Invasive extraintestinal pathogenic Escherichia coli (ExPEC) disease is defined as an acute illness consistent with systemic bacterial infection, which is microbiologically confirmed either by the isolation and identification of Escherichia coli (E. coli) from blood or any other sterile body sites, or by the isolation and identification of E. coli from urine in a participant with urosepsis and no other identifiable source of infection. ExPEC9V (JNJ-78901563, primary compound number: VAC52416) is a 9-valent vaccine candidate in development for active immunization for the prevention of IED in adults 60 years of age and older. Although IED affects all ages, adults aged greater than or equal to (>=) 60 years have an increased risk of developing IED, including bacteremia and sepsis, which can be community-acquired, hospital-acquired or healthcare associated. As the mechanism of action of conjugate vaccines in the prevention of invasive disease is not expected to be affected by antibiotic resistance mechanisms, that is, resistance mechanisms are not linked to O-polysaccharide structures, the sponsor has no reason to expect a difference in outcome of efficacy between antimicrobial-resistant and susceptible O-serotypes. This study incorporates an inferentially seamless group-sequential design. This study consists of a Screening Phase (selected screening procedures may be performed up to 8 days prior to vaccination on Day 1), Vaccination Phase (Day 1) and Follow-up Phase (up to 3 years post-vaccination). The total study duration is up to 6 years and 4 months. Key safety assessments include serious adverse events (SAEs), solicited and unsolicited adverse events (AEs), physical examination, and vital signs.
The purpose of this study is to demonstrate the efficacy of 9-valent extraintestinal pathogenic Escherichia coli vaccine (ExPEC9V) compared to placebo in the prevention of the first invasive extraintestinal pathogenic Escherichia coli disease (IED) event caused by ExPEC9V O-serotypes.