Typhoid fever is caused by ______.

bacteria

The correct answer is Option (3)- bacteria

Typhoid fever is caused by bacteria.

Explanation:

The bacteria responsible for typhoid fever is Salmonella enterica serotype Typhi. This bacterium is transmitted through contaminated food or water and primarily affects the intestinal tract. Typhoid fever is characterized by symptoms such as high fever, abdominal pain, and gastrointestinal issues. Proper sanitation and vaccination are essential for prevention. Unlike viruses, protozoa, and fungi, bacteria cause typhoid fever.