Which is not transmitted breast milk?

Even if HCV RNA is present in breast milk, there is little evidence for its relevance to HCV transmission to children. This lack of evidence might be due to a high blood-to-milk gradient ranging from 103 to 107, and low concentrations of viral paicles may be inactivated in the gastrointestinal tract. Neutralizing effect of persisting maternal antibodies in nursed children Another possible but not proven reason -presence of lactoferrin in mammalian breast milk- inhibit the replication CMV and HIV-1 in vitro. Breast milk may be contaminated with viruses such as rubella virus, CMV, and HIV-1.