👉 Ricketness, also known as ricketteinosis or rickettsia infection, is a condition in which the body produces antibodies against Rickettsia, an organism that causes tick-borne fevers. This can lead to fever and other symptoms in some people who have been bitten by a infected animal. The exact cause of rickettesis has not yet been fully understood, but it appears to be caused by a type of bacteria called Rickettsia prowazekii