Yes, there was also the blood in chocolate fiasco sending panic in the camps. I don't know how many letters the chocolate companies received on the subject from enquiring minds. Fortunately, it didn't last for long. (The chocolate bars in question did have 'plasma' listed in the ingredients.)
And yes to the red specks in eggs being off limits, religiously checking all the ingredients on processed foods, and avoiding anything containing the famous red beetle blood - actually falling for the idea that beetles have blood - how gullible can you get!
Oh, and did anyone do this : go out to fancy(ish) restaurants and ask the waiter to go check if the duck had been bled so you would know if you could order it or not ?