I've changed my response to Karen's post to the Teach list because I want to share a site that another teacher in Japan adapted (by simplifying a little of the language) into a lesson for students here. Unfortunately, I can't attach the handout he created, but it's been widely used as the basis of reading, writing, and discussion lessons.
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http://www.harrisoncountyhealth.com/flu_prevention.htm>
--Peg