For folks back when this "short" was made, they weren't as aware of toxic wastes, untreated sewage water flowing in their creeks, etc., so this animated documentary was a good wakeup call. The message here is to keep babies healthy and away from diseases that were fairly prevalent apparently in this time period.
Inoculations and better sanitation are the suggestions here, and what's wrong with that? Judging by how "dated" some of these diseases are in this short, a lot of progress has been made, although we still have concerns in related areas today.
Check out the gloom-and-doom left-wing loonies here on the user-comments who hate positive messages or anything in which Americans are portrayed as good people trying to help each other. Talk about illness!
This interesting, eye-opening documentary, animated by the famous Chuck Jones, was part of the Looney Tunes Golden Collection Volume 2. It's recommended except for people are obsessive-compulsive like the TV character, "Monk," who would get super-paranoid watching this 10 minutes of germ-talk.