[vhawk01]

Ah, found what I was looking for. The average transmission rate following a cutaneous puncture from an infected patient is .3% for HIV, and only .09% for mucous membrane transmission. These numbers for hepatitis B are 6-24%, and for hepatitis C 1-10%. I think that covers the majority of your discrepancy.

There are also about 1.5 million people who have hep-B and about 4 million who have hep-C. So, someone who is better at math than me, feel free to add those numbers up and tell me what the discrepancy should be, based on random chance, between HIV contraction and hep contraction for health care workers.