Early 20th century saw the outbreak of a deadly mysterious disease, pellagra that could cause anything from fever to dementia to death. The disease that had killed over 100,000 people by the end of 1914 was shrouded in deep mystery because of the fact that the epidemic was largely limited to the...

Mononucleosis Mononucleosis is an infectious disease found in humans, in which the blood and tissues contain mononuclear leukocytes. These are white blood cells with only one nucleus, either monocytes or lymphocytes. An infectious disease is a disease that can give you an infec...