key: cord-0995792-4nlwlo5d
authors: Padhi, Sunali; Suvankar, Subham; Dash, Debabrata; Panda, Venketesh K.; Pati, Abhijit; Panigrahi, Jogeswar; Panda, Aditya K
title: ABO blood group system is associated with COVID-19 mortality: An epidemiological investigation in the Indian population
date: 2020-09-25
journal: Transfus Clin Biol
DOI: 10.1016/j.tracli.2020.08.009
sha: 122f94c765fae53a3758e9e52a6db85a66a4124c
doc_id: 995792
cord_uid: 4nlwlo5d

Background: Novel coronavirus disease-19 (COVID-19) has spread worldwide, and to date presence of the virus has been recorded in 215 countries contributing 0.43 million of death. The role of blood groups in susceptibility/resistance to various infectious diseases has been reported. However, the association of blood groups with susceptibility to COVID-19 infections or related death are limited. In the present report, we performed an epidemiological investigation in the Indian population to decipher the importance of blood groups concerning susceptibility or mortality in COVID-19 infection. Materials and Methods: Data on COVID-19 infection and mortality was obtained from the website of the Government of India. Prevalence of ABO blood groups in different states and union territories of India were searched using different databases such as PubMed and Google Scholar. Relevant articles were downloaded, and data were extracted. Spearman’s rank coefficient analysis was employed to study the correlation between blood group frequencies and COVID-19 infection or mortality rate. Results: A significant inverse correlation was observed between the frequency of O blood group and the COVID-19 mortality rate (Spearman r = -0.36, P=0.03), indicating a possible protective role of O blood group against COVID-19 related death. In contrast, the prevalence of blood group B was positively correlated with COVID-19 death/million (Spearman r = 0.67, P<0.0001), suggesting B blood type as a deleterious factor in COVID-19 infection. Conclusions: ABO blood group system is associated with poor prognosis of COVID-19 infection. Blood group O may protects, and subjects with blood type B could be susceptible to COVID-19 mortality. However, further studies on COVID-19 infected patients in different population are required to validate our findings.

peak levels between the ages of 5 to 10, and decline after the age of 50 [4] . Previous reports have demonstrated the association of ABO blood group system with susceptibility to a wide range of virus infections such as Severe Acute Respiratory Syndrome [5] , symptomatic West Nile Virus [6] , Human Immunodeficiency Virus [7] , Hepatitis B [8] and Norwalk virus [9] . Some recent reports highlighted a possible association between ABO blood groups system and COVID-19 infections and mortality in the Chinese [10] , American [11] , Spanish and Italian populations [12] . O blood group has been associated with protection from COVID-19 infection and clinical severity [10] [11] [12] . In contrast, blood group A has demonstrated as a risk factor for COVID-19 [10] [11] [12] . In the present Page 4 of 9 J o u r n a l P r e -p r o o f epidemiological investigation, we explored the possible association of blood groups with COVID-19 infection and mortality in the Indian population.

India is comprising of twenty-eight states and eight union territories (UTs). Data on the prevalence of different blood groups in various states and UTs were screened through PubMed, Google Scholar. A recent report highlighted the enrolment of appropriate controls for the association study between the ABO blood group system and the COVID-19 infection or mortality [13] . The present study included publications on the frequency of ABO blood group system in healthy controls. Various data such as names of the states or UTs, the total number of healthy controls, and the frequency of different blood groups were extracted.

COVID-19 related information was obtained from the official website of the Ministry of Health and Family Welfare, Government of India (https://www.mohfw.gov.in, assessed on 12/06/2020). The number of confirmed cases and patients who died due to COVID-19

infections were noted down. The total population of each state and UTs were acquired from data of census-2011 (https://censusindia.gov.in/2011-common/censusdata2011.html), and COVID-19 cases per million and death rate /million were calculated.

The prevalence of blood groups in different states and UTs of India, along with the infection, and the rate of mortality due to COVID-19 per million of the population were calculated.

All statistical analysis was performed by Graphpad Prism 8.3.0. Correlation between J o u r n a l P r e -p r o o f different blood groups and COVID-19 infections/death rate per million was investigated by Spearman rank coefficient analysis, where a P-value <0.05 was considered significant.

On 30 th January 2020, India reported the first case of COVID-19 in a student who (Table-1 ).

Prevalence of the ABO blood group in the subjects of different state and UTs of India were obtained from various databases. Out of twenty-eight states and eight UTs, the frequency of the ABO blood group was not available for Goa, Chandigarh, and Lakshadweep, leading to the exclusion of these states and UTs from the present analysis.

Spearman correlation analysis revealed a marginal inverse association between blood group O and COVID-19 death per million (r=-0.370, p=0.033) ( Table-2 ). However, the correlation between blood type O and the COVID-19 infection rate was not significant (r=-0.225, p=0.206). A recent report in the Chinese population demonstrated an association of blood type O with a lower risk of COVID-19 infection and mortality [10] . However, patients enrolled from Renmin Hospital of Wuhan University, and Shenzhen Third Peoples's Hospital failed to demonstrate such association of blood group O with COVID-19 infection or mortality [10] . Besides, a hospital-based investigation in New York, USA, revealed a lower risk of COVID-19 infection in the subject harboring O type blood [11] . A J o u r n a l P r e -p r o o f recent genome-wide association study in Spanish and Italian COVID-19 infected patients revealed the protection of blood group O from severe respiratory failure [12] .

Hospital [10] . Such a relationship was not withstood in patients included from the Renmin Hospital of Wuhan University and Shenzhen Third People's Hospital of China [10] .

Furthermore, the association of blood type A has been documented with susceptibility to COVID-19 infection in New York, USA [11] , and increased risk of respiratory failure in Spanish and Italian patients [12] . In contrast, we observed a positive correlation of blood group B with COVID-19 infection (r=0.364, p=0.037) and mortality rate (r=0.687, p<0.0001) ( Table-2 ). These conflicting observations on the association of blood group A or B with COVID-19 infection and related death could be attributed to the discrepancies in investigated ethnic populations and different strains of SARS-CoV2 with varying pathogenicity. Earlier reports have elegantly demonstrated a population-specific link between blood groups A, B, or AB with severe Plasmodium falciparum malaria and death [14] .

The mechanism of how B blood type is associated with susceptibility to COVID-19 infections and mortality is not known. The spike protein of COVID-19 requires angiotensin-converting enzyme-2 (ACE-2) receptor to infect a cell [15] . The interaction between spike protein of SARS-CoV and ACE-2 receptor is hampered in the presence of anti-blood type A [16] , which could be an explanation for the protection of blood group O antigens would be reduced [17] . Furthermore, the degree of protection against SARS-CoV-2 infection maybe depends on ABO antibodies titer, which is inversely correlated with the extent of industrialization [18] .

Plasmodium falciparum malaria has been a major selective force on the human genome and beneficial genotype selected out in the endemic population. India and Africa contribute most malaria infections and death worldwide. In earlier reports, in malarial-endemic areas, we have demonstrated an association of blood group O with reduced risk and blood type B with an increased possibility of malarial death [14, 19] . Thus, blood type O remains highly prevalent in malaria-endemic areas compared to other blood groups [14, 19] . Possibly higher occurrence of O blood type in malaria-endemic regions is lowering the incidence of COVID-19 mortality. The higher prevalence of blood group O in malaria-endemic areas such as Odisha, Bihar, Jharkhand could be a possible reason for lower COVID-19 mortality rate in those geographical areas.

Although the present epidemiological report highlighted a possible role of blood groups with COVID-19 infection and mortality rate, it has some limitations. First, the association study was not performed in COVID-19 patients. Blood group frequency and COVID-19 infection status were obtained from the online database and reports. Second, due to the unavailability of data, Rh factors were not considered for analysis. Third, confounding factors such as age, gender, comorbidity status, the economic condition of states and UTs, doctors, and nursing staff density were not included in the present analysis. Further studies in COVID-19 patients from other geographical areas are required to validate our findings.

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