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Viral loads in rhesus macaques after oral exposure to SIV. Control macaques and animals that developed gingivitis after 5 weeks of tooth ligature were exposed to SIVmac251 by the oral route as described in Materials and Methods. Viral loads were determined by the NASBA method in RNA extracted from plasma of infected macaques and are expressed as genome equivalents (geq)/ml. WPI, weeks postinfection.
