Viruses might pass through the placenta

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Some researchers found the cold virus can infect two different cells that pass through the placenta and leveraging them as a Trojan horse of sorts. It had been though it blocked harmful things from passing through. Their work was done with a cold virus, but they think it applicable to RSV and Zika. In the case of RSV, it might explain some asthma cases if it were to attack the fetus’ lungs.