
There Are A Lot Of Stages For New Vaccines
Even when a vaccine is started from a vaccine that already exists, like scientists often do with the flu vaccine as that changes every year, there are still several stages that the vaccine goes through just in development. First, there is the exploratory stage. The second stage is known as preclinical and the third as clinical development.
The fourth stage is a regulatory review and approval. The fifth stage is known as manufacturing, with the final stage called quality control. Of course, some of these stages have their own set of processes. For example, clinical development is a three-phase process.