I: Certain infectious and parasitic diseases

A65-A69: Other spirochaetal diseases

The group of conditions under the title 'Other spirochaetal diseases' is a category of infections caused by a specific type of bacteria known as spirochaetes. These bacteria are spiral-shaped, and they can invade various parts of the body, causing different symptoms depending upon the site of the infection. The transmission mode can vary based on the type of disease, with some transmitted via ticks or lice, while others can be spread through close human to human contact. Typical symptoms experienced can include skin rashes, fever, fatigue, joint pain, nervous system problems and heart complications. It's worth noting that these conditions may progress over time if untreated, leading to severe complications affecting various organs and systems in the body, such as the heart, nerves, and brain. The group is diverse and incorporates varying manifestations of the diseases inflicted by these bacteria.