Answered by Shaykh Faraz Rabbani
Many vaccines/immunisations contain pork and other haram ingredients, especially those administered to children. What is the ruling when they are necessary to prevent spread of disease?
Walaikum assalam wa rahmatullah,
I pray this finds you in the best of health and spirits.
It is permitted to take immunizations and vaccines, and to assume that they are from pure ingredients. If it is specifically established otherwise, then one should consult with scholars about the specifics of the situation.
And Allah alone gives success.
Faraz Rabbani