I wish we had a poster of this in our public restrooms. Though I'm a little confused as to why Kagura and Tomo are the ones explaining everything.
I guess Kagura and Tomo are giving the explanation because they form the Bonkuras trio with Osaka. Which I guess, leads to the question of why they used Osaka? I suppose she's arguably the most popular character, or something about her personality leads itself well to these sorts of things.
Heat the food adequately! (over a minute at 75°C)Azumanga DaiouKeep the knives, chopping boards and other kitchen utils, and foodstuffs, clean!Advice concerning O-157!!Before meals, and after going to the bathroom...Wash your hands!To prevent an O-157 infection you should...Wash your hands with soap after going to the toilet and before cooking and eating!