Security and immunogenicity of the chlamydia vaccine candidate CTH522 adjuvanted with CAF01 liposomes or aluminium hydroxide: a prime-in-human, randomised, double-blind, placebo-controlled, phase 1 trial – The Lancet
Summary Background Chlamydia is the most common sexually transmitted bacterial infection worldwide. National screening programmes and antibiotic treatment have failed to decrease incidence, and to date no vaccines against genital chlamydia have been tested in clinical trials. We aimed to assess the safety and immunogenicity, in humans, of a novel chlamydia vaccine based on a…



Chlamydia is principally the most traditional sexually transmitted bacterial an infection worldwide. Nationwide
screening programmes and antibiotic medication appreciate did not lower incidence, and
to this point no vaccines in opposition to genital chlamydia were examined in scientific trials.
We aimed to assess the security and immunogenicity, in humans, of a unique chlamydia
vaccine in response to a recombinant protein subunit (CTH522) in a top–boost immunisation


This phase 1, first-in-human, double-blind, parallel, randomised, placebo-controlled
trial became performed at Hammersmith Health center in London, UK, in healthy females primitive 19–45
years. Participants were randomly assigned (Three:Three:1) to some groups: CTH522 adjuvanted
with CAF01 liposomes (CTH522:CAF01), CTH522 adjuvanted with aluminium hydroxide (CTH522:AH),
or placebo (saline). Participants bought three intramuscular injections of 85 μg
vaccine (with adjuvant) or placebo to the deltoid feature of the arm at 0, 1, and four
months, followed by two intranasal administrations of 30 μg unadjuvanted vaccine or
placebo (one in each and every nostril) at months four·5 and 5·0. The major became safety
and the secondary became humoral immunogenicity (anti-CTH522 IgG seroconversion).
This gaze is registered with

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Between Aug 15, 2016, and Feb Thirteen, 2017, 35 females were randomly assigned (15 to CTH522:CAF01,
15 to CTH522:AH, and five to placebo). 32 (91%) bought all five vaccinations and
all participants were included within the draw-to-treat analyses. No connected serious
detrimental reactions were reported, and basically the most frequent detrimental occasions were gentle local
injection-feature reactions, which were reported in all (15 [100%] of 15) participants
within the 2 vaccine groups and in three (60%) of 5 participants within the placebo neighborhood
(p=0·0526 for both comparisons). Intranasal vaccination became not connected with a
greater frequency of connected local reactions (reported in seven [47%] of 15 participants
within the active medication groups
vs three [60%] of 5 within the placebo neighborhood; p=1·000). Both CTH522:CAF01 and CTH522:AH
brought on anti-CTH522 IgG seroconversion in 15 (A hundred%) of 15 participants after five
immunisations, whereas no participants within the placebo neighborhood seroconverted. CTH522:CAF01
confirmed accelerated seroconversion, increased IgG titres, an enhanced mucosal antibody
profile, and a more consistent cell-mediated immune response profile as compared with


CTH522 adjuvanted with either CAF01 or aluminium hydroxide appears to be true and
effectively tolerated. Both vaccines were immunogenic, though CTH522:CAF01 had a greater
immunogenicity profile, conserving promise for added scientific style.


European Commission and The Innovation Fund Denmark.

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