"Swissmedic announced Wednesday it was investigating cases of bubble formation in a batch of bivalent booster shots developed by Pfizer (NYSE:PFE) and BioNTech (NASDAQ:BNTX) to protect against the original COVID-19 virus and Omicron BA.1 subvariant."
The batch already contained bubbles in some of its vials at the time of removal from refrigeration, Swissmedic said, adding that the incidence appeared to worsen “when the syringes are prepared several hours in advance.
Until the investigations are complete, the regulator recommends that the vials containing bubbles or particles should not be used, and syringes should not be filled more than 15 minutes before the administration.
Pfizer (PFE) was not immediately available for comments."
Normally all pharmaceuticals would have pretty stringent testing on particles (https://www.uspnf.com/sites/default/files/usp_pdf/EN/USPNF/revisionGeneralChapter788.pdf) and would need to use degassed water for injectables.
But go ahead and see if you can get a certificate of analysis (CoA) for any of these jabs.