Which activity does NOT transmit Human Immunodeficiency Virus (HIV)?

Casual contact, such as hugging, does not transmit Human Immunodeficiency Virus (HIV) because the virus is primarily spread through specific bodily fluids—such as blood, semen, vaginal fluids, and breast milk—transmitted in particular scenarios like sharing needles, receiving blood transfusions, or having unprotected sexual intercourse. HIV is not spread through casual interactions that involve no exchange of these fluids, which is why hugging, shaking hands, or similar forms of contact pose no risk for transmission. Understanding the modes of transmission and the nature of HIV helps to combat stigma and educate individuals on safe practices.