What type of microorganism causes Infectious Hepatitis A (HAV)?

Infectious Hepatitis A (HAV) is caused by a virus, which is a type of microorganism that is fundamentally different from bacteria, protozoa, and rickettsia. Viruses are much smaller than bacteria and do not have a cellular structure. They rely on living host cells to replicate and cause disease. Hepatitis A specifically targets liver cells and is transmitted primarily through the fecal-oral route, often linked to contaminated food or water.

Understanding that HAV is a virus is essential for public health measures and prevention strategies, such as vaccination and promoting proper sanitation practices. This distinction also helps in the identification and control of outbreaks, making it crucial for professionals in the public health field, like sanitarians, to recognize the viral nature of Hepatitis A.