Brief resume of intended work:

 A novel human coronavirus, first detected during an unexplained cluster of pneumonia cases in Wuhan, China in December 2019 has caused a global outbreak and has become a major public health problem worldwide. The World Health Organization (WHO) officially named this new coronavirus disease as COVID 19 and the virus causing it as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). WHO also declared COVID 19 as pandemic on March 21, 2020. According to WHO website as of August 28th, 2020, around 2,42,99,923 confirmed cases and 8,27,730  deaths have been reported from across the world  and  in India COVID 19  is around 3,94,513 confirmed cases and 62,669 deaths ¹.  COVID 19 patient’s presents from mild symptoms of upper respiratory tract infection to severe respiratory failure. 80-85% of patients are asymptomatic or have self-limiting disease and remaining have severe disease.  Many COVID 19 individuals have died due to complications from some of the main risk factors for COVID 19 such as ARDS, pneumonia, coagulopathy, acute kidney failure, acute heart failure etc which is likely attributable to uncontrolled acute inflammation and cytokine storm².  Clinical data obtained from COVID-19 patients in China reported high concentrations of cytokines in patients admitted to the ICU, which indicates the presence of cytokine storm in severe COVID-19 cases³. So it is important to know the levels of inflammatory markers to identify patients at high risk for severe COVID-19 and mortality.

          Human observational studies have frequently reported that higher vitamin D levels were associated with lower inflammatory markers including CRP, IL-6 and TNFα in healthy populations, and in those with proinflammatory conditions, such as diabetes, arteriosclerosis and inflammatory polyarthritis⁴. A cross-sectional analysis across Europe showed that COVID 19 mortality was significantly associated with vitamin D status in different populations and that vitamin D status was strongly associated with Covid-19 mortality ⁵.

        As the COVID 19 pandemic continues to increase and currently no effective vaccines or specific drugs against COVID 19 have been reported, the need to understand the predictors of severe COVID 19 is becoming important, so that early identification of severity and prognosis of COVID-19 enables early intervention for the reduction of mortality risk.  Hence we hypothesize that, haematological and biochemical markers in COVID 19 infection positive persons would be significantly associated with mortality and morbidity and vitamin D deficiency is associated with COVID 19.