Age-related immunogenicity and reactogenicity of live oral cholera vaccine CVD 103-HgR in a randomized, controlled clinical trial.

Abstract:

:Aging is accompanied by a decline in immune function which can lead to decreased responses to vaccines. Attenuated recombinant Vibrio cholerae O1 vaccine strain CVD 103-HgR elicits a rapid serum vibriocidal antibody (SVA) response and protects against cholera diarrhea in volunteer challenge studies but has not been studied in older adults. We evaluated CVD 103-HgR (PXVX0200) in adults age 46-64, compared them to previously studied adults age 18-45, and studied age-related immunogenicity across adults 18-64 years of age. Volunteers were randomized to receive a single dose of 1 × 109 CFU of PXVX0200 or placebo. Immunogenicity endpoints included SVA and anti-cholera toxin (CT) antibody levels on days 1, 11, 29, 91 and 181 and lipopolysaccharide (LPS) and CT-specific IgA and IgG memory B cells on days 1, 91 and 181. Safety was assessed by comparing solicited signs and symptoms on days 1-8 and other adverse events through day 181. 2979 volunteers received vaccine, including 291 age 45-64. Day 11 seroconversion occurred in 90.4% of older adults vs 93.5%% of younger adults and met the endpoint of demonstrating non-inferiority between the two groups. Significant increases in LPS-specific IgG and IgA and CT-specific memory IgG memory B cells were seen at days 91 and 181. There appeared to be a continuous age-related decline in SVA seroconversion and geometric mean titers, but not memory B cell responses, across the 18-64 year age range. Most reactogenicity was mild and was more common in the placebo group. PXVX0200 appears safe and immunogenic in older adults. Clinical Trials Registration: clinicaltrials.gov NCT02100631.

journal_name

Vaccine

journal_title

Vaccine

authors

McCarty JM,Lock MD,Bennett S,Hunt KM,Simon JK,Gurwith M

doi

10.1016/j.vaccine.2019.01.077

subject

Has Abstract

pub_date

2019-03-07 00:00:00

pages

1389-1397

issue

11

eissn

0264-410X

issn

1873-2518

pii

S0264-410X(19)30162-8

journal_volume

37

pub_type

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