What is a bactericide?

• A. A substance that promotes bacterial growth
• B. A substance that kills bacteria
• C. A type of nutrient for bacteria
• D. A method of sterilization

Answer: (B)

A bactericide is specifically defined as a substance that kills bacteria. This definition is integral to understanding the role of bactericides in infection control, sterilization processes, and overall microbial management. Bactericides can be found in various forms, including chemical agents and certain physical modalities, and they are crucial in contexts such as healthcare, where preventing bacterial infections is essential.

The application of bactericides is critical in environments where the risk of bacterial contamination is high, such as hospitals and laboratories. Understanding the effectiveness of these agents in various situations helps healthcare professionals employ the right strategies for infection control.

In contrast, the other options do not accurately define a bactericide. Substances that promote bacterial growth or serve as nutrients support the proliferation of bacteria, and a method of sterilization refers to processes that eliminate all forms of microbial life, which is different from the specific action of killing bacteria. Hence, the definition of bactericide as a substance that kills bacteria is the most accurate and relevant in this context.