While it's true that vaccines contain bacteria or viruses, the amount injected into your child in a vaccine is tiny compared with the amount of bacteria that enters your child's body every day while playing with other children or sucking on fingers and toys.
(the amount of bacteria; enters; your child's body; T:every day; T:while playing with other children or sucking on fingers and toys)
the amount of bacteria
enters
your child's body T:every day T:while playing with other children or sucking on fingers and toys