Let's talk infectious diseases, the reason for vaccines: ᶜᵒᵐᵇⁱⁿᵃᵗⁱᵒⁿ ⱽᵃᶜᶜⁱⁿᵉ: ᴹᴹᴿ

In 1971 the measles, mumps, and rubella (MMR) combination vaccine was licensed for use. Combination vaccines have several advantages over single vaccines. They reduce the need for several separate injections, and they reduce the costs of stocking and shipping multiple containers. Combination vaccines can help improve overall vaccination rates by simplifying the vaccination process.

One dose of MMR vaccine is 93% effective against measles, 78% effective against mumps, and 97% effective against rubella.

Two doses of MMR vaccine are 97% effective against measles and 88% effective against mumps.

{You can find all the sources I used by clicking here.}