One disease NOT caused directly by bacteria is.

Explanation

This question is asking which of the listed diseases is not caused directly by bacteria. The correct answer is Option A: malaria. Malaria is caused by a parasite called Plasmodium that is transmitted to humans through the bites of infected mosquitoes. Bacteria, on the other hand, are single-celled microorganisms that can cause a variety of diseases such as tuberculosis, pneumonia, tetanus and cholera. These bacteria can be transmitted through various means such as contact with contaminated surfaces or through the air. It is important to note that while malaria is not caused directly by bacteria, it is still a serious disease that affects millions of people worldwide, particularly in tropical and subtropical regions. Symptoms of malaria include fever, chills, headache, and muscle pain, and it can be fatal if left untreated. In summary, while bacteria can cause a variety of diseases, malaria is not caused directly by bacteria, but rather by a parasite transmitted through the bites of infected mosquitoes.