AIDS is not transmitted through:

The correct answer is Option (3) → Touching or physical contact with an infected person

AIDS is caused by the Human Immuno deficiency Virus (HIV). HIV spreads only through body fluids: by sexual contact with an infected person, by transfusion of contaminated blood and blood products, by sharing infected needles (as drug abusers do), and from an infected mother to her child through the placenta. It does not spread by mere touch or physical contact.

(1) Transfusion of infected blood — A way AIDS is transmitted. The virus in the donor’s blood enters the person receiving it.

(2) Sharing infected needles — A way AIDS is transmitted. Traces of infected blood left on the needle carry the virus.

(3) Touching or physical contact with an infected person — Not a way AIDS is transmitted. HIV does not pass through skin contact, so a person with AIDS should not be isolated from family and friends.

(4) Sharing infected syringes — A way AIDS is transmitted. A syringe carries blood from one user to the next, just as a needle does.

NCERT Extract:
AIDS – “… Transmission of HIV-infection generally occurs by (a) sexual contact with infected person, (b) by transfusion of contaminated blood and blood products, (c) by sharing infected needles as in the case of intravenous drug abusers and (d) from infected mother to her child through placenta. So, people who are at high risk of getting this infection includes - individuals who have multiple sexual partners, drug addicts who take drugs intravenously, individuals who require repeated blood transfusions and children born to an HIV infected mother. … Find out and make a list of such conditions. It is important to note that HIV/AIDS is not spread by mere touch or physical contact; it spreads only through body fluids.”