July 28 is World Hepatitis Day. Many associate liver diseases with alcohol but that's just one cause says an expert. Water and food are common carriers of the Hepatitis virus that affects the liver. Ashish Sharma consultant internal medicine Columbia Asia Hospital Ghaziabad explains the different types of hepatitis the symptoms and vaccines available: (Also read: Why is the liver so important?) Hepatitis A - It is the most harmless virus of the lot. Contamination of food and water are the prime reasons for the infection. The best way to prevent it is to be careful of what you eat.