Which condition is not considered a carrier-transmitted disease?

Oral cancer is not classified as a carrier-transmitted disease because it is not caused by infectious agents that can be transmitted from one individual to another. Instead, oral cancer generally arises from various risk factors such as tobacco use, alcohol consumption, certain strains of human papillomavirus (HPV), and chronic inflammation. These factors contribute to the development of cancerous cells, but they do not involve a carrier that passes the disease between people.

In contrast, the other conditions listed are all associated with infectious agents that can be spread from person to person. HIV/AIDS is transmitted through bodily fluids, tuberculosis spreads through airborne droplets, and syphilis is a sexually transmitted infection caused by the bacterium Treponema pallidum. Each of these diseases involves carriers—individuals who carry the infectious agent and can transmit it to others—whereas oral cancer does not follow that transmission model. Understanding the distinction between infectious diseases and conditions like oral cancer, which is primarily related to lifestyle factors, is fundamental in public health and treatment approaches.