* Typhus: This disease was also caused by a bacteria, Rickettsia prowazekii, and it was transmitted by lice and fleas. Symptoms included fever, chills, headaches, and a rash.
* Dysentery: This disease was caused by a bacteria or protozoan, and it caused severe diarrhea and dehydration.
* Cholera: This disease was caused by a bacteria, Vibrio cholerae, and it caused severe diarrhea and vomiting.
* Pneumonia: This disease was caused by a bacteria or virus, and it caused inflammation of the lungs.
* Tuberculosis: This disease was caused by a bacteria, Mycobacterium tuberculosis, and it caused inflammation of the lungs.
* Malaria: This disease was caused by a protozoan, Plasmodium, and it was transmitted by mosquitoes. Symptoms included fever, chills, and fatigue.
* Venereal diseases: These diseases were caused by bacteria or viruses, and they were transmitted through sexual contact. Symptoms included sores, discharge, and pain.