Bibcode:2020Natur.587..610Z. doi:10.1038/s41586-020-2818-3. PMID 32998156. [...] the risk is conferred by a genomic segment of around 50 kilobases in size that is inherited from Neanderthals and is carried by around 50% of people in south Asia and around 16% of people in Europe. ↑ Sample, Ian (30 September 2020). "Neanderthal genes increase risk of serious Covid-19, study claims".