are these on slides with a coverslip or is this in a dish?
ive seen (some) artifacts similar to this from the fixation protocol on a slide, but if its in a dish or a slide without a coverslip then yeah, looks like you at the very least are showing they are contaminated with something
like these
or this one ive seen with an air bubble,
but like i said that was with fixation, looking at cellular tissue, i doubt you would have used a fixative for a liquid, but just wanted to point out it looks similar.
im assuming you're doing this in a lab? if you have any left, id put some into a 24-48 well plate, dilute it with distilled water and possibly DMEM if you have it, pop it in the incubator for a few days and take pics every day, just to see if the contaminant is organic or not
also what magnification are these at?
it definitely has no microarchitecture, as in its not a normal cell body with distinct organelles
might be synthetic, at this point i doubt this is all artifact
how many slides did you make from the two vaccines?
if you have sample left and a glass bottom 24 well plate id definitely mix it with dmem, you might find something interesting, worth a shot
ideally you'd want to send a sample to genomics and mass spec but both of those are gonna cost a shit ton of money and leave a paper trail unless you have a friend running the core, or have a rig you can use