A review of the physicochemical properties of severe acute respiratory syndrome coronavirus 2 and its effect on coronavirus disease-2019 manifestation

Abstract

The coronavirus disease-2019 (COVID-19) has been declared a global pandemic by the World Health Organization due to its spread to more than 90% of nations of the world with significant consequences on their health, social structure, and economy. The causative agent, severe acute respiratory syndrome coronavirus 2, is a highly contagious virus of the coronaviridae family that is known to survive on many surfaces for days at various temperatures. It is acid stable at a high titer (1.2 × 103 PFU) for up to an hour and inactivated when exposed to temperatures 33°C and above for up to 30 min. Chemical agents such as ethanol, diethyl ether, chlorine, per-acetic acid, and chloroform likewise inactivate it as well as exposure to ultraviolet (UV) rays at 254 nm. Emerging evidence indicate that while modes of transmission of the disease are the same across the globe, incidence rates, clinical manifestation, severity, and outcome of COVID-19 in tropical Africa differ from other continent. Patients in Africa have presented with less severe symptoms, higher rates of recovery, and lower case-fatality rates. There are suggestions that higher environmental temperature and humidity in African countries, immune status, dietary pattern, and sociocultural practices of the people may have contributed to this. This review of literature sought to investigate the probable influence of these factors on the impact of COVID-19 in Africa with recommendations to mitigate its spread and impact on morbidity and mortality.