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saids
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Definitions of saids in various dictionaries:
noun - lord; sir -- used as a title of respect for a Muslim dignitary
SAIDS - Simian immunodeficiency viruses (SIVs) are retroviruses that cause persistent infections in at least 45 species of African non-human primates. Based ...
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Simian immunodeficiency viruses (SIVs) are retroviruses that cause persistent infections in at least 45 species of African non-human primates. Based on analysis of strains found in four species of monkeys from Bioko Island, which was isolated from the mainland by rising sea levels about 11,000 years ago, it has been concluded that SIV has been present in monkeys and apes for at least 32,000 years, and probably much longer.Virus strains from two of these primate species, SIVsmm in sooty mangabeys and SIVcpz in chimpanzees, are believed to have crossed the species barrier into humans, resulting in HIV-2 and HIV-1 respectively, the two human immunodeficiency viruses. The most likely route of transmission of HIV-1 to humans involves contact with the blood of chimps that are often hunted for bushmeat in Africa. It is theorized SIV may have previously crossed the species barrier into human hosts multiple times throughout history, but it was not until recently, after the advent of modern transportation and global commuterism, that it finally took hold, spreading beyond localized decimations of a few individuals or single small tribal populations. * Unlike HIV-1 and HIV-2 infections in humans, SIV infections in their natural African simian non-human hosts appear in many cases to be non-pathogenic due to evolutionary adaptation of the hosts to the virus. Extensive studies in sooty mangabeys have established that SIVsmm infection does not cause any disease in these African primates, despite high levels of circulating virus. However, if the virus infects an Asian or Indian rhesus macaque, these non-African simian primates will also develop simian AIDS (SAIDS), as they, like humans (despite being an African-origin simian primate species), have not had a prolonged history with the virus. A recent study of SIVcpz in wild living chimpanzees suggests that infected chimpanzees experience an AIDS-like illness similar to HIV-1 infected humans. The later stages of SIV infection turn into SAIDS, much as HIV infection turns into AIDS. |