. . . Why is HIV not transmitted from an infected individual to an uninfected individual by a mosquito bite? What is a difference between pathogenicity and virulence? Explain what an LDso value is. What are the five stages of acute infection? When do normal signs and symptoms occur?
HIV is an abbreviation for Human Immunodeficiency Virus. It is a retrovirus that targets the immune system, specifically CD4+ T cells (a type of white blood cell) that play an important role in the body's defence against infections. HIV gradually weakens the immune system, making it more difficult for the body to fight infections and diseases. If HIV infection is not treated, it can progress to AIDS (Acquired Immunodeficiency Syndrome), in which the immune system is severely damaged and the individual becomes vulnerable to a variety of opportunistic infections and certain cancers. HIV is primarily transmitted from an infected person to an uninfected person through contact with specific body fluids such as blood, sperm, vaginal fluids, rectal fluids, and breast milk from an infected individual to an uninfected person.
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