Contact the infection control office at your hospital- ours has this really neat infrared-wand thing that would be good for this presentation. They told us to wash our hands after rubbing a special solution on them. Then they took this infrared thing and waved it over our hands and it showed where we missed- under our nails, etc. The kids would probably think it is really neat. Have hygeine-related prizes for games or answering questions- yummy flavored toothpaste, mouthwash, neat toothbrushes, fun looking soaps, small bottles of bubble bath, etc.etc. Bring in some really gross pictures of bad hygeine- like yellow teeth, etc. (gee...why do we all think of teeth when we suggest things like this? lol) An idea I found on the internet suggested that you bring a big bucket, enough glitter to go around, some hand lotion, paper towels. Have the kids put lotion on their hands, then sprinkle glitter on their hands (over the bucket to catch stray glitter) and tell them to rub it in really good. Then give each of them a paper towel and ask them to try to get it off. (they can't get it all off...) Then tell them to rinse in just plain water (some comes off but not all) and finally have them rinse in soap and water (pretty much all of it should come off). You can do this with all of them, or just a few as examples. The glitter=germs on their hands. I thought it was a cute idea. You could show them a picture of a bathroom on an overhead projector and ask them where they think the dirtiest place is (ie, the toilet, the floor, etc.) and then tell them where germs can be (ie, the door handles, faucet handles, etc.) or have them take turns guessing where germs could be found. You can ask them how germs get passed from one person to another (coughing, sneezing, touching, etc.) and maybe make up some rhymes to remind them how this happens. Put the rhymes on a coloring page (you could make this on your computer) and print them out to give out during the class. I also found this:
BEFORE setting the table
BEFORE emptying the dishwasher
AFTER using the toilet
AFTER sneezing, coughing and/or blowing your nose
AFTER touching garbage
AFTER touching your pet
AFTER touching blood
AFTER playing in the backyard
AFTER shaking someone's hand
AFTER visiting someone who is sick
AFTER riding on the school bus
AFTER getting a scrape on your knee or a cut on your hands
AFTER cleaning up spills
BEFORE AND AFTER changing the litter box
BEFORE AND AFTER eating food
BEFORE AND AFTER playing with your younger brother or sister
to help you remind them when they should wash up.
I found a whole bunch of crap on here and I'm really tired so forgive me if it's jumbled. ;>P
Germ-spreading: Get a water mister that has a fine mist setting and fill it with water. Tell them that germs are invisible and we can't see or feel them, but that the water drops represent the germs- ask them how many germs can fit in one little drop of water...tell them millions of germs can fit in one tiny drop. When we sneeze or cough, little germs fly out of our mouths. Ask them how far germs can fly. Then take the water bottle, and tell them that it's like a sneeze (you could even look up how fast germs travel in a sneeze; i know I've seen this in mph somewhere on the internet before...useless facts or something). spray the bottle at them and ask who got touched by the water to demonstrate how they spread germs when they dont' cover their mouths to cough or sneeze.
Talk about lice- who can get them (anyone), tell them you had them (even if you never did, surely some kids in the class can relate), how thry spread, how to not get them (don't wear other peoples hats, use their combs, etc.) blahblah.
Talk about sunscreen and maybe show photos of skin lesions to gross them out and show them what happens if they don't use it. Tell them if they don't have sunscreen at home, and can't get any, to wear hata, light colored clothes, long sleeves, etc.
Hope these help! Let us know how it goes! ;>)