In Recent Years, More Cases of Pertussis or Whooping Cough

question 18

Multiple Choice

In recent years, more cases of pertussis or whooping cough have occurred because of waning immunity in vaccinated individuals. Increased susceptibility to disease can begin at what point in time?

• A) 7 years after the last vaccination
• B) 5 years after the last vaccination
• C) 12 years after the last vaccination
• D) 20 years after the last vaccination

---

Definitions:

Current Flow

The movement of electric charge carriers, like electrons, through a conductor or circuit, typically described from positive to negative points.

Electron

A subatomic particle with a negative electric charge, fundamental to electricity, and a key component of atoms.

Atom

The smallest unit of a chemical element, consisting of a nucleus and electrons, forming the basis of all chemical substances.

Knock

A term often used in automotive to describe the premature combustion of fuel in the cylinder of an engine, leading to inefficient performance.