Final answer:
The percentage of HIV infections from casual contact in North America as of January 2006 is very low.
Step-by-step explanation:
The percentage of the total HIV infections that occurred by casual contact in North America as of January 2006 is very low. HIV is primarily transmitted through direct contact with body fluids such as blood, semen, vaginal fluids, and breast milk, and casual contact is not sufficient for the transmission of the virus.