Tattooing involves piercing the skin. If needles or other instruments used for tattooing are not properly sterilized and have been contaminated with infected blood, blood-borne viruses can be transmitted. 1. Chikungunya is a viral disease transmitted by mosquitoes, not through blood-to-blood contact via needles. 2. Hepatitis B is a blood-borne virus that can be transmitted through contaminated needles, syringes, or other sharp instruments. 3. HIV-AIDS is caused by the Human Immunodeficiency Virus (HIV), which is primarily transmitted through blood, semen, vaginal fluids, and breast milk. Sharing contaminated needles is a known risk factor for HIV transmission.