Why most vaccines have to be given by injection?

Most vaccines need to be given by injection because entering the stomach can make one ill. However entering through the bloodstream doesnt cause illness

Most vaccines are given by injection because injection is the simplest way into your bloodstream

Ifound this on google “interphase is divided into three phases: g1, s, and g2. the subsequent mitotic (m) phase consists of two processes: mitosis, the process of nuclear division, and cytokinesis, division of the cell's cytoplasm. each mitotic phase results in the formation of two cells that are genetically identical to the parent. for more information go to the web down below cyberbridge.mcb.harvard.edu › mitosis_3i hope this you for what your looking for.can you plz mark me brainliest?