Why Do we Fall Ill — Science STD 9 — Question

Hepatitis is a disease in which the liver becomes enlarged. The symptom of the disease is the yellowing of the skin and the whites of the eyes, as condition referred to a jaundice. The yellowing is because of the presence of excessive bilirubin (a bile pigment) in the blood.
Viral hepatitis is caused by different strains of the hepatitis virus and the hepatitis caused is named after it. Thus we have, hepatitis. $A$ to hepatitis - $G,$ named after the strains $A, B, C, D, E, F$ and $G.$ Some of these strains $($e.g., hepatitis - $A)$ get transmitted through contaminated food or water. Other, $($e.g., hepatitis - $B)$ get transmitted through blood, semen, saliva and breast milk.