Family Rickettsiaceae is a classification of microorganisms that cause various types of diseases in humans. Some common synonyms for this family are Rickettsia, Coxiella, Orientia, and Ehrlichia. These microorganisms are characterized by their small size, and they are often transmitted to humans through insect bites. They cause a wide range of illnesses including fever, rash, arthritis, and lung infections. In severe cases, these diseases can lead to organ failure and even death. It is important to be aware of the different synonyms for Family Rickettsiaceae to better understand the various diseases caused by these microorganisms and to identify them more effectively.