avoid accidentally inject the vaccine directly in the vain
to avoid serious side effects...
like thrombosis with thrombocytopenia syndrome (TTS)

should be intramuscular
not intravascular

"injection, with aspiration prior to injection, could be a potential preventive measure when administering adenovirus-based vaccines.... "

please help to share this info "to prevent really serious life treating complications"
says

Dr. John Campbell

really important
check details
in his youtube
great video with anatomic guide references!