Multiple choice

When a microbe enters our body for the second time, the immune system acts and eliminates it quicker than the first time. This is known as the principle of _________.

  1. immunization

  2. infection

  3. prevention

  4. disease spread

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This describes the principle of immunization, where memory immune cells recognize pathogens from previous exposure and mount a stronger, faster response. Infection refers to the initial invasion, prevention is stopping disease before it occurs, and disease spread refers to transmission between people.