There is some evidence that PEG could be contributing to these allergic reactions. And that's because people are routinely exposed to PEG in cosmetic and household products, and some people have already developed antibodies against PEG.
It turns out that every person's immune system is different, and just the same way that some people are allergic to latex, other people are allergic to PEG.
It's important to keep in mind, however, that PEG has had a long history of safe use as part of FDA-approved drug formulations, and these vaccine allergies could be caused by things other than PEG.
It's important to keep in mind, however, that PEG has had a long history of safe use as part of FDA-approved drug formulations, and these vaccine allergies could be caused by things other than PEG.