Is it permissible to take vaccinations that contain haram ingredients if there is a high probability of infection spreading in a work environment with children, knowing that some of them are necessary and some are preferred to be taken?

If the aforementioned contents are processed until they transform into another substance and no trace of them remains, then there is no harm in using them for treatment. However, if they do not transform and a trace of them remains, then it is not permissible to use them for treatment except out of necessity, and only if no permissible alternative is available.