Link to the article: https://pubmed.ncbi.nlm.nih.gov/32599103/
Vitamin D has been found to be important for the immune system and typically equator countries tend to have a higher dose due to their location. Looking at 88 countries and available data, they found there was a relationship between latitude and COVID-19 deaths consistent with previous literature. Populations at risk for low doses of Vitamin D are at higher risk of death from COVID-19.
TL;DR There is a correlation between latitude and COVID-19 deaths