[https://amp.cnn.com/cnn/2020/08/17/health/immunity-studies-optimism-covid-19/index.html](https://amp.cnn.com/cnn/2020/08/17/health/immunity-studies-optimism-covid-19/index.html) >"Studies show that humans have a "robust" immune response to Covid-19 that may protect them from further coronavirus infection, even if they had mild symptoms. The studies indicate immunity could last for months."