I see the conclusion now is that human was not involved in drug trials that put 6 people in hospital last month. It seems all protocol were followed and even in hindsight the reaction could not have been predicted.
This is another great example of how people understand risk. We all know there are risks in drug trials, which is why they are done in the first place. People don't seem to understand what that risk actually means. In particular, even we know there is a risk there is an expectation that no one will be harmed.
These articles give the latest update.