Which of the following is true of small pox?

Step 1: Analyze the question We are asked which statement is true about smallpox. Let's test each option against what we know.

Step 2: Key concept Smallpox was caused by the variola virus. It spread mainly through airborne droplets and direct contact. Because it is a viral disease, antibiotics do not work against it. The disease was controlled through vaccination, and the World Health Organization declared it eradicated in 1980. Edward Jenner developed the first vaccine in 1796, using cowpox material.

Step 3: Evaluate the options

• A. Transmitted by bacteria: False. Smallpox is caused by a virus, not bacteria.
• B. Controlled with antibiotics: False. Antibiotics act on bacteria, not viruses.
• C. Controlled by vaccination: True. Vaccination is how smallpox was brought under control and eventually eradicated worldwide.
• D. Water-borne infection: False. Water-borne diseases include cholera and typhoid. Smallpox spreads through the air and by contact.

Step 4: Answer

Exam tip: Remember the rule "viruses = vaccines, bacteria = antibiotics." Diseases like smallpox, polio, measles, and yellow fever are viral and are prevented by vaccination. Cholera, typhoid, and tuberculosis are bacterial and are treated with antibiotics.