Papaya for parasites

I have a couple of questions about this fruit.

1. First of all, has anybody used it with a positive effect?

2. What kind of parasites does it kill?

3. Only seeds are the combat part of the fruit? What about whole fruit (fresh/dried/canned), juice, or extract like this one -> http://www.amazon.com/gp/aw/d/B005TK5MQI/ref=mp_s_a_4?qid=1336140397&sr=8-4

It's got some great reviews for boosting platelet count.

4. Where can I buy organic seeds in USA?