MCQ IN MEDICINE

Detailed explanation-1: -Viruses make us sick by killing cells or disrupting cell function. Our bodies often respond with fever (heat inactivates many viruses), the secretion of a chemical called interferon (which blocks viruses from reproducing), or by marshaling the immune system’s antibodies and other cells to target the invader.

Detailed explanation-2: -Most infectious diseases have only minor complications. But some infections-such as pneumonia, AIDS and meningitis-can become life-threatening. A few types of infections have been linked to a long-term increased risk of cancer: Human papillomavirus is linked to cervical cancer.

Detailed explanation-3: -Infectious diseases are illnesses caused by germs (such as bacteria, viruses, and fungi) that enter the body, multiply, and can cause an infection. Some infectious diseases are contagious (or communicable), meaning they are capable of spreading from one person to another.