LAUSR

Background: In Nigeria, the policies and interventions due to the COVID-19 pandemic are majorly directed at businesses and relief. There are no clear plans to identify individuals with comorbidities associated with high morbidity and fatality rates. This paper identifies comorbidities associated with high morbidity and fatalities of COVID-19 across countries and vulnerable groups in Nigeria. Methods: Peer-reviewed articles published between 2010 and 2020 retrieved from Google scholar, African Journal Online, EMBASE, Scopus, and MEDLINE/PubMed (central) were systematically reviewed. Results: The pooled prevalence of hypertension is the lowest in North Central Nigeria (22.0%) and the highest in South-Eastern Nigeria (33.6%) while the pooled prevalence of diabetes mellitus (DM) is lowest in North-Western Nigeria (3.0%) and highest in South-Southern Nigeria (9.8%). Significant differences in the frequency of comorbidities (hypertension, DM, cardiovascular disease, cancer, and chronic kidney disease; CKD) and complications (cardiac injury and acute respiratory disease syndrome; ARDS) were observed between fatal and non-fatal cases of COVID-19 (p<0.0001). There were significant correlations between hypertension and ARDS (p=0.002), DM and ARDS (p=0.010), hypertension and (p<0.0001), DM and CKD (p=0.033), and hypertension and DM (p=0.001). Conclusion: High prevalence of comorbidity may be predictive of high COVID-19 morbidity and mortality. Thus, to flatten the curve early intervention funds should be appropriately allocated based on the prevalence of comorbidities in the geopolitical zones. Such high-risk groups should be identified, stratified and actively monitored during treatment to prevent the development or progression of complications such as cardiac injury and ARDS.