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There are no guarantees, but there are ways of dramatically reducing the likelihood of a mother passing the virus on to her children. As our article states, ""where combination antiretroviral drug treatment and Cesarian section are available, [the] risk [of transmission] can be reduced to as low as one percent.""  Obviously only a physician would be able to prescribe that drug or arrange for the C-section, and so the woman would have contact her physician as soon as she knows she's pregnant. -  "