AIDS is spread by physical contact [D] through the exchange of bodily fluids. The transmission routes include unprotected sexual intercourse, sharing needles or syringes, and from mother to child during childbirth or breastfeeding. Additionally, blood transfusions with contaminated blood can spread HIV, which causes AIDS. Casual contact, such as shaking hands, hugging, or sharing food, does not transmit the virus. AIDS is not spread through respiratory contact like coughing or sneezing, nor is it transmitted by insects such as mosquitoes. Preventing the spread of HIV involves practicing safe sex, using clean needles, and ensuring safe blood transfusions. Public health initiatives aim to educate individuals on safe practices and provide testing and treatment to reduce the risk of transmission.