SARS-CoV-2 is the name for the pandemic coronavirus that causes the illness COVID-19, which affects people in extremely different ways. While it tends to be deadliest in the elderly or those with other health conditions, some victims have been relatively young or healthy. Scientists are now looking to the human genome to see if it can provide an explanation. Though we all carry basically the same genes, small changes in the sequences of those genes give rise to wide biological variation; this may be why COVID-19 is so mild in some while being so deadly to others.

 

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