history of virus discovery

A virus is a microscopic parasite that infects a cell-sized biological organisms. Viruses can only reproduce in living material to invade and take advantage of living cells because the virus does not have the equipment provider to reproduce itself. In the host cell, viruses are obligate parasites and outside its host to become impotent. Usually the virus contains a small amount of nucleic acid (DNA or RNA, but not a combination of both) are shrouded in a kind of protective material composed of proteins, lipids, glycoproteins, or a combination of all three. Both viral genome encodes a protein that is used to contain genetic material or proteins required in the life cycle. The term virus usually refers to particles that infect cells of eukaryotes (multicellular organisms and many types of single-cell organisms), while the term bacteriophage or phage is used for species that attack the cell types of prokaryotes (bacteria and other organisms that are not core cell) . Viruses are often debated status as a living being because he is unable to perform the biological function freely. Because of its distinctive characteristics of these viruses are always associated with certain diseases, both in humans (eg influenza virus and HIV), animals (eg bird flu virus), or plants (eg tobacco mosaic virus / TMV)

what is AIDS ?

One in four people infected with HIV suffer from neurological complications, new Canadian research reveals. And those that do have such problems harbor double the risk of dying compared with HIV patients who are not plagued with neurological diseases, the study authors reported in the Sept. Acquired Immunodeficiency Syndrome or Acquired Immune Deficiency Syndrome (AIDS abbreviated) is a collection of symptoms and infections (or: syndrome) arising due to damage to the human immune system due to HIV infection; [1] or infection with other viruses that attack similar to other species (SIV, FIV, etc.). Own virus called Human Immunodeficiency Virus (HIV or abbreviated) is a virus that weakens the immunity in the human body. People affected by this virus will become vulnerable to opportunistic infections or tumors susceptible. Although the existing handling can slow the rate of virus growth, but the disease is not completely curable. HIV and similar viruses are generally transmitted through direct contact between the layers of the skin (mucous membrane) or the bloodstream with a bodily fluid containing HIV, such as blood, semen, vaginal fluid, preseminal fluid, and breast milk. [2] [3] Transmission can occur through sexual intercourse (vaginal, anal, or oral), blood transfusion, contaminated needles, between mother and baby during pregnancy, childbirth, or breastfeeding, as well as other forms of contact with these body fluids. Scientists generally believe that HIV originated in sub-Saharan Africa. [4] Now that AIDS has become a plague. Estimated AIDS has infected 38.6 million people around the world. [5] In January 2006, UNAIDS in collaboration with the WHO estimate that AIDS has caused the deaths of more than 25 million people since it was first recognized on June 5, 1981. Thus, this disease is one of the deadliest plague in history. AIDS claimed to have caused death as much as 2.4 to 3.3 million people in 2005 alone, and more than 570,000 people of whom are children. [5] A third of these deaths occur in Sub-Saharan Africa, retarding growth economy and destroy the power of human resources there. Antiretroviral treatment can actually reduce the death rate and severity of HIV infection, but access to treatment is not available in all countries.