Emerging viral infections in human beings:

Recent illustrations of emerging viral infections in various regions of the world comprise HIV, Dengue, Ebola virus, Hemorrhagic fever, Lassa fever, Rift valley fever, and SARS.

AIDS:

AIDS (Acquired Immuno Deficiency Syndrome) is a recently introduced sexually transmitted virus disease. AIDS is caused by Human Immuno Deficiency.

 Figure: Human Immuno Deficiency Virus (HIV)

HIV belongs to a class of viruses termed as retroviruses. This infects the T₄ lymphocytes termed as helper cells that form the main line of the body immune system. HIV kills the T₄ lymphocytes and the resultant depletion of T₄ cell population generates an immune deficiency. It paves way for numerous opportunistic pathogens to attack. AIDS by itself is not a murderer disease. It is only the other opportunistic pathogens that kill the infected persons.

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