Identifying Non-Bacterial Diseases: Malaria Focus

The question asks us to identify which disease from the provided list – Diphtheria, Whooping cough, Typhoid, Diarrhea, and Malaria – is not caused by bacteria. Understanding the causative agents of common diseases is crucial in biology and health studies.

Disease Causation Breakdown

Let's examine the cause of each disease mentioned:

• Diphtheria: This is an infection caused by a bacterium known as Corynebacterium diphtheriae.
• Whooping Cough (Pertussis): This highly contagious respiratory disease is caused by the bacterium Bordetella pertussis.
• Typhoid: This is a serious illness caused by infection with the bacterium Salmonella Typhi.
• Diarrhea: While often associated with bacterial infections (like those caused by E. coli or Salmonella species), diarrhea can also be caused by viruses, parasites, or other factors. However, many common types have bacterial origins.
• Malaria: This disease is caused by parasitic protozoa belonging to the genus Plasmodium. These parasites are transmitted to humans through the bites of infected female mosquitoes (Anopheles species). Importantly, malaria is not caused by bacteria.

Comparative Table of Diseases

Here's a summary comparing the diseases and their primary causative agents:

Conclusion on Malaria

Based on the analysis, Malaria stands out as the disease in the list that is caused by a parasite, not a bacterium. Therefore, Malaria is the correct answer to the question asking which disease is not caused by bacteria.