The likelihood of HIV transmission from kissing is minimal. HIV is generally transmitted through unprotected sex, and other blood-borne transmission such as intravenous drug use, tattooing or invasive procedures in informal places. There is also mother-to-child transmission, where a pregnant woman carrying HIV without formal interruption can easily pass it on to the next generation. The AIDS virus is mainly found in human blood, semen, vaginal secretions and cervical secretions of women, while saliva, sweat, tears, urine and feces basically do not contain the virus, or contain very small amounts of the virus and do not constitute an infection. The HIV virus is also very fragile, and is far less infectious than other hepatitis B viruses.