Hepatitis A is a serious, highly infectious disease of the liver caused by the hepatitis A virus. It can lead to varying degrees of illness, hospitalization, or even death. Complete series of 2 Hepatitis B is caused by a virus that attacks the liver. It can lead to severe liver disease, cancer, or liver failure and death. Although it is usually mild and not life threatening, each year about 100 people die from this disease.
Varicella can cause infections, pneumonia, and encephalitis.
It is usually a mild disease in healthy children, young adults, and middle-age people. However, flu can be life-threatening in older people and in people of any age who have chronic illnesses such as heart disease, emphysema, asthma, bronchitis, kidney disease, or diabetes. Flu symptoms include weakness, cough, headache, and a sudden rise in temperature. The fever can last from 1 to 6 days. Other symptoms include aching muscles, chills, and red, watery eyes.