Who prepares vaccines

Before they are given to your baby? Our pediatrician usually does the check up then tells us how many vaccines are going to be given and then says his good byes and tells us the nurse will be with us shortly, minuets later the nurse comes in with the vaccines i'm curious as to who does them like i'm pretty sure the nurse does because I figure the doctor doesn't have time. I'm asking because where we take our daughter we have always been seen by the same nurse but there works this girl there she's now a nurse but went to high school with me , I was dating this guy and he had showed me a letter that a girl had written him telling him to leave me for her , a few days later he breaks up with me and is with her now that's not a problem as I don't care, she has a kid with him and I found an amazing guy that i'm now married to and we have an 11 month old and another on the way. What concerns me is that what if we have her(the girl my ex left me for ) as a nurse and since she hates me does something to the vaccines or injects my baby roughly just to take it out on me, now I know her doing something like that will get her into very big trouble and could even cause her to loose her job but I'm just being careful because every time we go she always gives me these death stares like girl relax, I don't want your baby's father trust me , don't you see my husband and daughter with me ? this happened over 4 years get over it

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