Abstract:
:This was a randomized, placebo-controlled, Phase I/II study conducted in a Japanese cohort to assess the safety and immunogenicity of Clostridium difficile vaccine (the same formulation as that used in the ongoing global Phase III study). Healthy Japanese adults aged 40-75 years were randomized to receive either C. difficile vaccine (N = 67) or placebo (N = 34) by intramuscular injection on Days 0, 7, and 30. Serum IgG specific for toxins A and B was measured by enzyme-linked immunosorbent assay (ELISA) and in vitro functional activity by toxin neutralizing assay (TNA). The seroconversion rate (percentage of participants with a ≥4-fold rise in antibody levels from baseline) was high for both toxin A (ELISA and TNA) and toxin B (ELISA), approaching 100% for each by Day 60. For toxin B assessed by TNA, however, the response was lower, with the seroconversion rate not rising significantly beyond the value of 42.9% seen on Day 14 (44.4% at Day 60). Although the response in the participants who were seronegative at baseline was slower than that in those who were seropositive, seroconversion was seen in nearly all (100%) subjects by Day 60, with the exception of the response to toxin B evaluated using TNA (16-18% on Days 14-60). The proportion of participants with solicited local reactions, solicited systemic reactions, and vaccine-related unsolicited reactions were 67.6%, 19.1%, and 20.6%, respectively. Most of the adverse reactions were mild to moderate in intensity, occurring within 3 days post-vaccination, and resolving by 3-6 days post-vaccination. There were no withdrawals due to adverse events and no serious adverse events. These data confirm the safety and immunogenicity of C. difficile vaccine in Japanese adults.
journal_name
Hum Vaccin Immunotherjournal_title
Human vaccines & immunotherapeuticsauthors
Matsuoka O,Patel DM,Sasaki S,Oka H,Sasaki T,Pietrobon PJ,Laot T,Bouckenooghe A,Menezes J,de Bruyn Gdoi
10.1080/21645515.2017.1395538subject
Has Abstractpub_date
2018-02-01 00:00:00pages
322-328issue
2eissn
2164-5515issn
2164-554Xjournal_volume
14pub_type
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