During WWII, many American filmmakers gave up their normal jobs and began working for the US government in order to make army training films. Among these filmmakers were also animators, such as Chuck Jones, Hugh Harmon and Dr. Seuss. Of these training films, the ones that hold up best and are generally a lot of fun to see are the Private Snafu shorts. They are funny, occasionally VERY crude (as they were meant to be seen by soldiers not the general public) and quite informative--passing on needed advice to soldiers about a variety of topics.
"It's Murder She Says..." is kind of a Private Snafu film. I say 'kind of' because he's really barely in it and doesn't even speak. Instead the main character is a down and out mosquito infected with Malaria and she reminisces about the good old days before mosquito control. Her advice clearly is to warn soldiers to take preventative measures....or else.
The problem with this short is without Snafu and humor, all you're left with is an animated training film....which has much more limited appeal today. Instead, I recommend you watch "Private Snafu vs. Malaria Mike"....a similar film but with a high dose of fun! Both are available on YouTube.