Very short answer type.
Name two diseases of human beings caused by virus.

• A viral diseaseoccurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells.
• Chickenpox, also known as varicella, is a highly contagious disease caused by the initial infection with varicella zoster virus.
  
• Human Immunodeficiency Virus (HIV) Human Immunodeficiency