A vaccine is a biological preparation that provides active acquired immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, and to further recognize and destroy any of the microorganisms associated with that agent that it may encounter in the future.
It depends on the way of using the vaccine.
If such vaccine is to be taken orally, it will Haraam to consume it.
But if it is not taken orally but injected in the body or dropped in the nose with out letting it go inside the stomach, then it will be allowed.
Please explain what do you mean by WI-38, WI-26 , MRC-5 ?
Do you have concrete evidence that killing of babies is the only way to make these vaccines?