Vitamin D mediates crosstalk between COVID-19 and osteoporosis

The global outbreak of the highly infectious severe acute respiratory syndrome coronavirus 2 (SARS–COV-2) resulted in the pandemic of the coronavirus disease 2019 (COVID-19), which has claimed over 6.4 million lives worldwide to date. Several types of COVID-19 vaccines have been developed, many of which have received approval from global regulatory bodies. However, genomic mutations have led to the emergence of new SARS-CoV-2 variants, which have reduced the effectiveness of these vaccines.