How hiv infects the systems

Create health care programs providing antiretroviral therapy to extend life and reduce HIV transmission rates.


CD4 cells are part of the immune system. Part of the fear of HIV comes from lack of education. They can spread HIV to others without even knowing it. After initial entry of HIV and establishment of infection, replication may at first occur within inflammatory cells at the site of infection or within peripheral blood mononuclear cells, but then the major site of replication quickly shifts to lymphoid tissues of the body, including those in lymph nodes, spleen, liver, and bone marrow.

The CD4 lymphocyte count remains moderately decreased. The information provided by these tests is similar, so no advantage accrues from performing all of them simultaneously.

Last full review: HIV is classified into 3 stages: Leave this field blank.

HIV Tutorial

During this time, the amount of CD4 cells starts to fall very quickly. About half of children with perinatally acquired HIV infection are alive at 9 years. Regular blood tests will check the number of CD4 cells in the body called the CD4 cell count and the viral load.

how hiv infects the systems

Email address. However, a variety of factors affect HIV progression, and some people progress through the phases of HIV more quickly than others. The stage of clinical AIDS that is reached years after initial infection is marked by the appearance of one or more of the typical opportunistic infections or neoplasms diagnostic of AIDS by definitional criteria.

how hiv infects the systems

Tests also are available without a prescription at the drugstore. Retroviruses are unable to replicate outside of living host cells because they contain only RNA and and do not contain DNA. Eventually, when a significant number of CD4 lymphocytes have been destroyed and when production of new CD4 cells cannot match destruction, then failure of the immune system leads to the appearance of clinical AIDS.

how hiv infects the systems

There has been no study to date that shows a failure of HIV-infected persons to evolve to clinical AIDS over time, though the speed at which this evolution occurs may vary.

Phylogenetic studies can identify genetic clusters of HIV-1 env genes which are known as subtypes, or clades, that have arisen with progression of the AIDS epidemic worldwide. Learn more about HIV and life expectancy.

how hiv infects the systems

There are many more peripheral blood mononuclear cells capable of either harboring or becoming infected by HIV in blood than are present in other body fluids or secretions. Infants in whom such signs appear at 3 months tend to have decreased survival. You can do the test at home.

how hiv infects the systems