It's telling that only one of these studies is published in a journal where I can find the full text (with MIT journal access). Sadly, it's only really possible to judge the research in that article, which is questionable. They test the susceptibility of e. coli strains to various oils, at 8-12 uL/mL. I think the only observation one needs point out is that concentration in a person's blood would kill them too. I wish it were otherwise, but you can't believe all peer-reviewed science.