A rapid ecologic analysis, confirmed by a case–control study, identifies class I HLA alleles correlated to the risk of COVID-19

Table 2 Study population

Residence	Controls	Hospitalized COVID-19 cases	Total
Calabria	206	36	242
Campania	191	39	230
Total	397	75	472

Controls were randomly selected from the Italian National Bone Marrow Donor Registry (IBMDR) and matched (by frequency matching) to cases

ISSN: 1479-5876