According to many medical professionals, vaccines have had the greatest impact on human health of any medical intervention to date. Vaccines as a group of biologics are often considered to be the lifeline of the human race.
With the exception of safe water, no other modality, not even antibiotics, has had such a major effect on mortality reduction...
S. Plotkin, W. Orenstein, P. Offit, Vaccines (Saunders, Philadelphia, 5th ed. 2008)
With the number of vaccines currently in development as well as the push for COVID-19 vaccine production, the vaccine market is expected to see significant growth over the next five years.