Imperial CHIM study feedback28 Jan 2022 12:09
I took part in yesterday evening's Imperial-led HIC-Vac focus group meeting to discuss the results of its Wuhan CHIM study (naive, unvaccinated volunteers) and share our thoughts on a future Delta CHIM (vaccinated volunteers, some of whom would instead be infected with Wuhan, for comparison purposes *).
*this bit would seem to overlap with the just-announced Oxford study. Does it ? My Q was noted, I may get a reply later.
Disclaimer : What follows is only my understanding/’good faith’ interpretation of event contents.
hVivo got a credit as participant in the study, clients being SAGE + NERVTAG + Vac Task Force + DoHealth.
The study seems to have been pretty rigorous : 187 volunteers were screened, 147 rejected, 4 withdrew or dropped out, net 36. Roughly 50% got infected, so the dosage level was spot on.
The main results related to detailed data re disease progression; range of symptoms; and relative performance (accuracy/timing) of PCR and lateral flow tests. Much of this seems to have informed the detail of subsequent government advice/ policy.
But the study seems also to have found that the nose was a more significant repository - and vector - of infection than the throat, which AFAIAA wasn’t widely communicated to the public. Several participants queried this.
Thankfully , there were no serious ‘ adverse’ reactions, although loss of smell lingered in a few (3/36 cases) and , perhaps tellingly, we were told that future studies would alert potential volunteers of this specific risk.
The volunteers were 2/3rds M , 1/10th BAME, median BMI 24, some time was spent discussing how to get a more diverse / representative cohort in future trials.
The results should be released – pre-print – in a week or so.
The focus group consensus feed-back / mood seemed to be that this first trial had been ‘high risk/high reward’ and had to some extent been overtaken by events : the equation had changed with advent of treatments (regeneron and anti-viral pills) on one hand and reduced virulence of variants on the other.
The moderator didn’t push back on this. When asked ‘why not jump to test agst Omicron’, we were told that (a) this trial outcome should speed decision-making up and (b) there were lots more studies to derive from this, as each (material) variant taught something new. This, of course, is a researcher's viewpoint !
Someone asked what the volunteers felt now about the overall value of the exercise. Not clear if we’ll get a reply / the question has been asked
There’s clearly a lot still to find out : rather disarmingly, when somebody asked about using antibody tests for screening, the comment was ‘ we test anti-bodies because we can; they may not be the best test.'
Regarding the upcoming Delta based trial, if approved (they hope ‘shortly’), it may take some time , challenging 60 (+ 30 Wuhan) in phases, dictated by the available 6-bed containment venue.
Continued...