Negri bodies, also called inclusion bodies or intracytoplasmic eosinophilic bodies, are small structures found in cells infected with certain viruses, such as rabies virus, measles, and smallpox. These structures are named after Adelchi Negri, an Italian pathologist who first described them in 1903. Despite their significance in disease pathology, the term "Negri bodies" is rarely used outside the medical field. Synonyms for Negri bodies include "cytoplasmic inclusions," "viral inclusions," "viral cytoplasmic inclusions," or simply "inclusions." These terms describe the same structures and are used interchangeably in scientific literature. Understanding these terms is crucial in the diagnosis and treatment of viral diseases.