Hepatitis A virus (HAV) is a no enveloped, spherical, positive stranded RNA virus. Hepatitis A was initially called infectious hepatitis, epidemic hepatitis, epidemic jaundice or catarrhal jaundice. It's mostly causes by poor sanitary conditions like exposure to contaminated fecal matter, eating food raised and cultured in contaminated water, exposure to infected blood or sexual contact, etc. The disease can be detected 3 to 4 weeks after the exposure and return to normal after 8 weeks or so. Immediate screening is necessary else the symptoms and condition will persist indefinitely.