Viruses
INTRODUCTION:
Viruses are submicroscopic infectious organisms, varying in size from 10 to 300 nanometer. They consist of genetic material-DNA, or the closely related RNA-surrounded by a protective (known as a cap Sid) of proteins. Viruses are most familar to us as the cause of human, animals and plants. Small pox (now eradicated), rabies and polio ancient examples. Other viruses, such as the human immune deficiency virus (HIV) the cause of AIDS seem to have arisen in more recent times.
Viruses arte incapable of independent existence. They can grow and reproduce only when they enter another cell, such as a bacterium or animal cell, because they lack energy-producing and protein synthesizing functions.
SOME OF THE DISEASES ARE AS FOLLOWS:
Rabies-Rhabdo virus
Chicken pox-Varicella
AIDS-HIV
Cold and sore throats-Adeno virus
Measles-Rubiola