Which term describes disease-producing bacteria that live everywhere?

• A. Pathogenic bacteria
• B. Saprophytes
• C. Cocci
• D. Streptococci

Answer: (A)

Disease-causing bacteria are described as pathogenic bacteria. The word “pathogenic” specifically means capable of producing disease or infection, which is why it’s the best fit for a description of bacteria that can cause illness and spread in environments where proper hygiene isn’t maintained.

The other terms describe different ideas rather than a role in causing disease. Saprophytes are bacteria that feed on dead organic matter rather than living tissue, so they’re not inherently disease producers. Cocci refer to a shape—spherical bacteria—rather than their ability to cause disease. Streptococci are a specific group of cocci that form chains, again focusing on shape and arrangement rather than overall disease-causing potential.

So, when the description is about bacteria that produce disease and can be found in many places, the term pathogenic bacteria best captures that meaning.