Quote:
Originally Posted by Zizu
“ Aspiration before injection of vaccines or toxoids (i.e., pulling back on the syringe plunger after needle insertion but before injection) is not necessary because no large blood vessels are present at the recommended injection sites, and a process that includes aspiration might be more painful for infants “
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Blood vessels are closely intertwined with skeletal muscle tissues and because vaccinating is a blind procedure, aspirating just ensures the needle tip has gone into desired location. In many instances, it makes little difference when a vaccine is given intravenously versus intermuscular, but during the trials for the Covid vaccine, it was discovered that messenger RNA vaccines should never be given intravenously.