scholarly journals ABO Blood Groups and COVID-19 Infection

2021 ◽  
Vol 156 (Supplement_1) ◽  
pp. S129-S129
Author(s):  
J M Petersen ◽  
D Jhala
Keyword(s):  
Blood Group ◽  
Blood Groups ◽  
Abo Blood Group ◽  
Rt Pcr ◽  
Susceptibility To Infection ◽  
Caucasian Americans ◽  
Group A ◽  
Group Information ◽  
Contradictory Evidence ◽  
Age Range

Abstract Introduction/Objective There exists contradictory evidence in the literature that ABO blood group may have some impact on risk of COVID-19 infection. Some argue that the blood group A may confer a higher susceptibility to infection and thus be overrepresented in those who test positive for COVID-19, though other studies in the literature do not support this. Therefore, we present a regional Veterans Administration Medical Center’s (VAMC) experience early in the pandemic to provide a reference on blood group and risk of testing positive early in the pandemic for a veteran population. Methods/Case Report A retrospective review of all positive SARS-CoV-2 reverse transcriptase polymerase chain reaction (RT-PCR) was performed for all RT-PCR tests collected at a regional VAMC from March 17th, 2020 to May 20th, 2020 was performed to collect ABO blood group information. Patients with no known ABO blood group were excluded. Results (if a Case Study enter NA) There were 81 patients who tested positive for SARS-CoV-2 with a known ABO blood group during the study period. This group had an age range of 45 to 99, consisted of 80 males and 1 female, and was racially proportioned at 57 African Americans (70.3%), 2 Asian Americans (2.5%), 1 Hispanic American (1.2%), 20 Caucasian Americans (24.7%), and one of unknown race (1.2%). The blood group distribution among these 81 patients was as follows: 39 were O+ (48.1%), 3 were O- (3.7%), 15 were B+ (18.5%), 3 were AB+ (3.7%), 18 A+ (22.2%), and 3 were A- (3.7%). Conclusion Comparison with the known distribution of ABO groups in the general population reveals that the proportion of blood groups of those testing positive are similar. This provides support to the proposition that the ABO type may not predispose significantly to COVID-19 infection.

scholarly journals The Impact of ABO Blood Group on Clinical Outcomes and Susceptibility in COVID-19: A Retrospective Population Study of 3305 Patients

Blood ◽  
2020 ◽  
Vol 136 (Supplement 1) ◽  
pp. 32-33
Author(s):  
Waleed Alduaij ◽  
Sarah Al-Youha ◽  
Ahmad Al-Serri ◽  
Sulaiman Almazeedi ◽  
Mohannad Al-Haddad ◽  
...  
Keyword(s):  
General Population ◽  
Clinical Outcomes ◽  
Blood Group ◽  
Blood Groups ◽  
National Database ◽  
Abo Blood Group ◽  
Abo Blood Groups ◽  
Susceptibility To Infection ◽  
Significant Difference ◽  
Group A

Background: Factors determining inherent susceptibility to infection with the novel severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) and the risk of severe outcomes in infected individuals remain poorly understood. Landsteiner ABO blood groups have been linked to host susceptibility to various infections through the interaction of the carbohydrate moieties defining ABO antigens with micro-organisms and the immune system. Previous studies of the original SARS coronavirus (SARS-CoV-1) demonstrated a decreased susceptibility to infection in group O individuals (Cheng et al. JAMA 2005; 293:1450-1) and the ability of plasma-derived anti-A antibodies to block the interaction between viral spike protein and human angiotensin-converting enzyme 2 receptor in vitro (Guillon et al. Glycobiology 2008; 18:1085-93). A recent genome-wide association study of patients with respiratory failure complicating coronavirus disease 2019 (COVID-19) suggested a higher risk of severe disease in group A, and a protective effect in group O (Ellinghaus et al. NEJM 2020 DOI:10.1056/NEJMoa2020283). Since the inception of the COVID-19 pandemic, a broad testing strategy was implemented in Kuwait and all individuals testing positive for SARS-CoV-2 were admitted to a single facility, including asymptomatic individuals. Here we examined the clinical outcomes of this cohort with respect to ABO blood group and compared its blood group distribution to that of the general population. Methods: All patients testing positive for SARS-CoV-2 by polymerase chain reaction assay of a nasopharyngeal swab specimen that were admitted to Jaber Hospital between February 24th to May 27th 2020 were included in the study. Relevant demographic and clinical data were extracted from hospital records. An anonymized summary of the distribution of blood types of the entire population of Kuwait was obtained from a national database and used as a control group. Clinical outcomes were in accordance with international consensus definitions. Appropriate statistical tests were used for bivariate analysis. Multivariate logistic regression was performed to determine relationships between variables of interest and outcome. Results: Of 3305 SARS-CoV-2 positive patients 37.1%, 25.5%, 28.9% and 8.5% were group O, A, B and AB respectively. 69.2% were male and 30.8% were female. Median age was 42 years. 48.1% were Kuwaiti citizens and 51.9% were non-Kuwaiti. Commonest comorbidities were hypertension (21.5%) and diabetes (20.1%). 17.4% were obese. 37.2% were asymptomatic on admission. There was no significant difference in baseline characteristics among the blood groups. Univariate analysis of clinical outcomes revealed no significant differences in need for oxygen support, admission to intensive care, intubation or death among the blood groups. However, rates of any adverse event and pneumonia differed significantly (Table 1). Multivariable analysis adjusted for age, sex, obesity and comorbidities showed that group A had higher odds of developing pneumonia compared to the other blood groups combined (adjusted odds ratio 1.32, 95% confidence interval 1.02-1.72, p<0.0363). We found no relationship between pneumonia and other blood groups. Compared to the general population, the COVID-19 cohort had a lower frequency of group O, equivalent frequency of group A and higher frequency of groups B and AB (Table 2). This trend was independent of nationality (Kuwaiti versus non-Kuwaiti). Incorporation of Rh (D) status did not impact the trend observed with ABO blood groups. Finally, no significant difference in Rh (D) status was found between the COVID-19 and general populations (Rh positive 93.4% versus 93.6% respectively, p=0.99) Conclusion: In a large, unselected patient population, no association between blood group and severe clinical outcomes in COVID-19 was found. Consistent with reports in other populations, we found a lower prevalence of blood group O in SARS-CoV-2 positive individuals and higher prevalence of blood group B and AB implicating a potential role of ABO blood group in susceptibility to infection. No association between SARS-CoV-2 infection with blood group A or Rh (D) group was found. Further examination of the mechanistic link between ABO antigens, antibodies and SARS-CoV-2, and its implications on controlling the current pandemic is warranted. Disclosures No relevant conflicts of interest to declare.

scholarly journals Frequency of ABO and Rhesus blood groups in Saudi healthy blood donors versus non-Saudi in a retrospective study in Makkah City

2021 ◽  
Vol 1 (1) ◽  
pp. 2-13
Author(s):  
Amal z. Moustafa ◽  
Mohammed S. Aldosari ◽  
Talat A. AL-Bukhari ◽  
Younis A. Allohibi ◽  
Shirin H . Teama ◽  
...  
Keyword(s):  
Retrospective Study ◽  
Blood Group ◽  
Blood Donors ◽  
Blood Groups ◽  
Abo Blood Group ◽  
Sri Lankan ◽  
Blood Storage ◽  
Blood Group A ◽  
Group A ◽  
Makkah City

Purpose: to assess the frequency of ABO and Rh blood groups among Saudi and non-Saudi healthy blood donors and to compare between them. Methods: A retrospective study was conducted; in Makkah City, Saudi Arabia. It included 15,365 participants of 44 nationalities who have attended the blood bank of King Abdul Aziz Hospital. The collected data were age, sex, nationality, ABO, and Rhesus blood groups.  Results: 46.8 % of the participants were O, 28.8 % A, 19.5 % B, and 4.9% AB. The nationalities with a higher frequency of blood group O were Saudi, Mauritanian, Yemeni, Thai, Malian, Sudanese, Jordanian, Indian, Moroccan, Somali, Malaysian, Indonesian, Myanmar, Nigerian, Pakistani, Bangladeshi, Algerian, Djibouti, Burkinabe, Eritrean, Ghanaian, Bahraini, Bosnian, Canadian, Gambian, Iraqi, and Sri Lankan. Those with a higher frequency of blood group A were Turkish, Palestinian, Syrian, Lebanese, Egyptian, Afghan, Chadian, French, Tunisian, Cameroonian, Ethiopian, and British.  Those with a higher frequency of B were Nigerien, American, Nepalese, and two nationalities with higher AB frequency Filipino and Chinese. 91.6 % of all populations were Rh-positive, and 8.4% were Rh-negative. The Saudi participants were like some nationalities and differed from others. Conclusion:  In Makkah city, the higher frequency of ABO blood group in Saudi and non -Saudi people is O followed by A, then B, and AB.  The Rh-positive is predominant, and 8.4% of the participants are negative. The ABO and Rh blood groups' identifications are essential for providing suitable blood storage for individuals in need.

scholarly journals Prevalence of ABO and Rh blood groups and their association with Transfusion-Transmissible Infections (TTIs) among Blood Donors in Islamabad, Pakistan

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Muhammad Yousaf Khan ◽  
Farwa Sijjeel ◽  
Ahmareen Khalid ◽  
Rukhshan Khurshid ◽  
Umm E Habiba ◽  
...  
Keyword(s):  
Viral Infection ◽  
Blood Group ◽  
Blood Donors ◽  
Blood Groups ◽  
Abo Blood Group ◽  
Blood Group System ◽  
Syphilis Infection ◽  
Group System ◽  
Group A ◽  
Group B

Certain Rh positive blood groups showed a link between the ABO blood grouping and susceptibility to some infectious ailments. Study was carried out to find the association of ABO Blood Group System / Rh type with different viral infection. A retrospective observational study was carried in 7631 blood donors to find the association of ABO Blood Group System / Rh type with viral infection due to hepatitis B virus, hepatitis C virus, human immunodeficiency virus and Syphilis. Data of the study indicateF that the highest incidence of blood group in blood donor was B followed by O, A and AB. The incidence of HBsAg +ve, HCV Ab +ve and infection of Syphilis was also highest in donor with blood group B followed by O, A and AB. Blood group A were more susceptible to HIV Ab +ve followed by blood group B, O and AB. The group B donors had the greatest risk of viral infection with HBV, HCV, HIV, and Syphilis; followed by the groups O, A, and AB. Donors in group AB had the lowest incidence rate of all viral infection. The study revealed that blood group B is most prevalent among donors, followed by blood groups O, A, and AB. On the other side, the rate of HBV, HCV, HIV, and Syphilis infection was greatest among group B donors, followed by group O, group A, and group AB. Copyright(c) The Authors

scholarly journals Relationship between blood group and gastric carcinoma in Erbil city: A case-control study

2021 ◽  
Vol 25 (3) ◽  
pp. 633-637
Author(s):  
Abdullah Ibrahim
Keyword(s):  
Gastric Carcinoma ◽  
Blood Group ◽  
Case Control Study ◽  
Case Control ◽  
Blood Groups ◽  
Abo Blood Group ◽  
Abo Blood Groups ◽  
Group A ◽  
And Control ◽  
Control Study

Background and objective: Gastric carcinoma can be caused by the interaction between environmental factors and genetic variations. The relationship between ABO blood groups and carcinogenesis or progression of human tumors has been reported by many investigations. This study aimed to understand the correlation between ABO blood groups and the risk of developing gastric carcinoma. Methods: This case-control study included the ABO blood group and rhesus system of 92 patients diagnosed with gastric carcinoma at Erbil city from 2017 to 2019. Informed consent was obtained from all patients. As a control, the blood group from 260 healthy blood donors was collected from Erbil blood bank. Results: Of 92 patients, 58.7% were males, and 41.3% were females. The mean age was 62 (28 - 97) years. Regarding the type of gastric carcinoma, 58.7% were intestinal, and 41.3% were diffuse type. Blood group and rhesus system of patients and control were compared. Blood group O was 47.8% in cases versus 40.8% in control and 42.6% in all participants, followed by blood group A (31.5% of gastric carcinoma patients and 26.5% of control with a total of 27.8% of all participants). Regarding the Rhesus system, 92.4% of cases were Rh+, and 7.6% were Rh- compared with 92.9% Rh+and 7.1% Rh- in control. None of them was statistically significant. Conclusion: There was no statistically significant association between blood groups and gastric carcinoma, although blood group O was more common, followed by A. Keywords: Gastric carcinoma; ABO blood group; Erbil.

scholarly journals ABO Blood Group is Associated with COVID-19 Susceptibility: a Systematic Review and Meta-Analysis

2020 ◽  
Vol 3 (1) ◽  
pp. 71-84
Author(s):  
Richard Chinaza Ikeagwulonu ◽  
◽  
Chinonyelum Thecla Ezeonu ◽  
Mark Uchejeso Obeta ◽  
Ngozi Immaculata Ugwu ◽  
...  
Keyword(s):  
Blood Group ◽  
Meta Analysis ◽  
Blood Groups ◽  
Blood Type ◽  
Abo Blood Group ◽  
Abo Blood Groups ◽  
Blood Group A ◽  
Search Terms ◽  
Group A

Introduction: Conflicting evidences exist that ABO blood groups correlate with the susceptibility to COVID-19 and its clinical outcomes. This study aimed to pool available articles that assessed a possible relationship between COVID-19 and ABO blood groups. Materials and methods: A search was conducted in four databases comprising Pubmed/Medline, Google scholar, Journal storage (JSTOR) and African Journals Online (AJOL) for relevant studies available before 25th August 2020 and contained extractable data on ABO blood type distribution and COVID-19 disease. Search terms included a combination of “ABO blood group, and COVID-19, coronavirus, and SARS-COV-2”. Results: Fourteen articles that met study inclusion criteria were selected from a total of five hundred and eighty-five articles identified through database search. The fourteen articles reviewed comprised of a total of 73934 subjects (13189 SARS-COV-2 positive cases and 60745 controls). Overall, the risk of SARS-COV-2 infection was found to be significantly increased in patients with blood group A with ORs: 1.24 (95%Cl: 1.09-1.41, P = 0.001). Additionally, blood group O subjects were seen to have decreased odds of contracting COVID-19 infection (OR: 0.78, 95%Cl: 0.68 – 0.89, P=0.0003). No significant association was found between ABO blood groups and COVID -19 severity and mortality. Conclusions: Blood group A was associated with a higher risk of SARS-COV-2 infection whereas risk of infection was lower in blood group O subjects. No statistical significant association was found between ABO blood groups and COVID-19 severity and mortality. The precise role of ABO blood group in COVID-19 susceptibility, severity and mortality requires further research for clarification.

scholarly journals ABO-RH blood group and risk of covid-19 in a moroccan population

2020 ◽  
Author(s):  
Mourad Belaouni ◽  
Elhoucine Malki ◽  
Rabii El Bahraouy ◽  
Bouchra El Maliki ◽  
Mohammed Er-Rami ◽  
...  
Keyword(s):  
Blood Group ◽  
Comparison Group ◽  
Blood Groups ◽  
Military Hospital ◽  
Control Group ◽  
Rt Pcr ◽  
Cross Sectional ◽  
Moroccan Population ◽  
Blood Group A ◽  
Group A

AbstractIntroductionGiven the rapid spread, significant morbidity and mortality associated with COVID-19, there has been scientific interest in obtaining data detailing the factors influencing the risk of COVID-19 infection. The aim of this study was to reveal a possible association between the ABO-RH system and the risk of COVID-19 in the Moroccan population.Materials and methodsThis is an analytical cross-sectional study. It was carried out on 1094 patients for the diagnosis of Covid-19 by Rt-PCR at the Moulay Ismaïl military hospital in the province of Meknes. All Rt-PCR negative individuals were used as a comparison group.ResultsAmong the 1094 individuals who were diagnosed, RT-PCR for detection of SARS-CoV-2 was positive for 242 individuals. Comparison of the proportions of blood groups of the two groups showed that the proportion of blood group A in patients with COVID-19 was significantly higher than in people in the comparison group (P = 0.007), while the proportion of blood group O in patients with COVID-19 was significantly lower than in people in the control group (P = 0.017). Comparison of the Rh blood groups of the two groups did not find a significant association (P = 0.608).ConclusionAs demonstrated by several previous studies, we concluded that blood group A was associated with a higher risk of acquiring COVID-19. Equally, the O blood group was associated with a lower risk of infection.

scholarly journals Association of ABO blood group with COVID-19 severity, acute phase reactants and mortality

2021 ◽  
Author(s):  
Uzma Ishaq ◽  
Asmara Malik ◽  
Jahanzeb Malik ◽  
Asad Mehmood ◽  
Azhar Qureshi ◽  
...  
Keyword(s):  
Logistic Regression ◽  
Blood Group ◽  
Cox Regression ◽  
Survival Function ◽  
Blood Groups ◽  
Abo Blood Group ◽  
Blood Group System ◽  
Acute Phase Reactants ◽  
Blood Group A ◽  
Group A

AbstractBackground and objectiveThe ABO blood group system has been associated with infectious and noninfectious disease, including dengue, hepatitis B virus (HBV), and severe respiratory syndrome coronavirus (SARS), etc. Coronavirus disease 2019 (COVID-19) is the ongoing pandemic with multitude of manifestations and association of ABO blood group in South-East Asian population needs to be explored.MethodsIt was a retrospective study of patients with real time polymerase chain reaction (RT-PCR) diagnosis of COVID-19 at Advanced Diagnostics and Liver Center between April 2020 to January 2021. Blood group A, B, O, and AB were identified in every participant, irrespective of their RH type and allotted groups 1, 2,3, and 4, respectively. Cox regression and logistic regression were used for inferential statistics.ResultsThe cohort included 1067 patients: 521 (48.8%) of blood group O, 295 (27.6%) of blood group B, 202 (18.9%) of blood group A, and 49 (4.5%) of blood group AB. The majority of the patients were males 712 (66.7%) with an average body mass index (BMI) of 27.45 ± 3.53. Patients with AB blood group stayed a median (IQR) of 14 (5, 27) days while A blood group cohort stayed 13 (6,27) days and overall 10.6% COVID-19-related mortality was observed at our center, with 13.9% in blood group A as the majority of COVID-19 deaths. Regarding severity of COVID-19 disease, there was a trend towards critical disease in blood group A and O (n=83, 41.1%; n=183, 35.1%; OR, 11.34 (95% CI, 46.79-53.22); p<0.001). Logistic regression demonstrates blood group O and AB as predictors for severe COVID-19 disease (O: OR: 0.438 (95% CI: 0.168-1.139) p=0.090; AB: OR: 0.415 (95% CI: 0.165-1.046) p=0.062) and cause-specific hazards ratio (HR) for survival function was 3.206 (p=0.361) among all blood groups.ConclusionAlthough the prevalence of blood group O was higher in this cohort, hospital stay, severity of disease, and mortality were associated with blood group A. Further studies are needed for understanding the underlying mechanism behind the association of blood groups with COVID-19.

scholarly journals Variations of prothrombin time among ABO blood groups in healthy adults

2021 ◽  
Vol 11 (3) ◽  
pp. 429-435
Author(s):  
Afrina Binte Azad ◽  
Qazi Shamima Akhter ◽  
Mohammad Aminul Islam ◽  
Farzana Yeasmin Mukta ◽  
Lily Afroz ◽  
...  
Keyword(s):  
Prothrombin Time ◽  
Blood Group ◽  
Blood Groups ◽  
Healthy Adults ◽  
Abo Blood Group ◽  
Abo Blood Groups ◽  
Medical College ◽  
Blood Group A ◽  
Group A ◽  
Group B

Background and objectives: ABO blood group distribution defers with racial and geographic variations. They are related with diseases like cardiovascular diseases, cerebral thromboembolism. Prothrombin time may varies among ABO blood group system which may increase the future risk of thrombosis. The present study is to assess prothrombin time among ABO blood groups in healthy adults. Materials and methods: A prospective type of analytical cross-sectional study was conducted in the Department of Physiology, Dhaka Medical College, Dhaka from July 2019 to June 2020. After obtaining ethical clearance, a total 190 healthy adults were selected from different areas of Dhaka city based on inclusion and exclusion criteria, with age ranging from 18-45 years. The subjects were interviewed and detailed history regarding personal, family, medical and drug were taken. Prior to sample collection, informed written consent was taken from the participants. Individuals of blood group A was selected as group A, blood group B as group B, blood group AB as group AB and blood group O as group O. Prothrombin time was measured in the Department of Hematology and BMT Unit, Dhaka Medical College Hospital, Dhaka. Blood grouping was done in the Department of Physiology, Dhaka Medical College, Dhaka.For statistical analysis, One way ANOVA followed by Bonferroni test were considered using SPSS 25.0 version. Results: In this study, blood group B was most common (33.2%). Prothrombin time was lower in blood group A (12.93±0.30 sec), B (12.92±0.61 sec), AB (12.98±0.54 sec) than blood group O (13.08±0.39 sec) which was not statistically significant. Conclusion: It can be concluded that blood group A, B, AB individuals may have more chance of thrombosis due to lower prothrombin time than blood group O individuals.

scholarly journals Relationship Between Blood Group and Risk of Infection and Death in COVID-19: a live Meta-Analysis

2020 ◽  
Author(s):  
Fateme Pourali ◽  
Mahdi Afshari ◽  
Reza Alizadeh-Navaei ◽  
Javad Javidnia ◽  
Mahmood Moosazadeh ◽  
...  
Keyword(s):  
Blood Group ◽  
Meta Analysis ◽  
Blood Groups ◽  
Abo Blood Group ◽  
Blood Group A ◽  
Mesh Terms ◽  
Newcastle Ottawa Scale ◽  
Group A ◽  
The Relationship ◽  
Ottawa Scale

AbstractIntroductionThe relationship between ABO blood group and the incidence of COVID-19 infection and death has been investigated in several studies. The reported results were controversial, so the objective of the present study is to assess the relationship between different blood groups and the onset and mortality of COVID-19 infection using meta-analysis method.MethodsWe searched the databases using appropriate MeSH terms. We screened articles on the basis of titles, abstracts, and full texts and the articles that met the inclusion criteria were selected. Quality assessment was done with the Newcastle-Ottawa Scale checklist. The estimated frequency of COVID-19 infection and death in terms of ABO blood group and the overall estimate of the odd ratio between blood group with COVID-19 infection and death was done with 95% confidence interval.ResultsThe pooled frequency of blood groups A, B, O, and AB among COVID-19 infected individuals was estimated as 36.22%, 24.99%, 29.67%, and 9.29% respectively. The frequency of blood groups A, B, O, and AB among the dead cases due to COVID-19 infection was estimated as 40%, 23%, 29%, and 8% respectively. The odd ratio of COVID-19 infection for blood group A versus the other blood groups was estimated 1.16 (CI 95%: 1.02-1.33). The corresponding figures for blood groups O and AB versus other blood groups were estimated as 0.73 (CI 95%: 0.60-0.88) and 1.25(CI 95%: 0.84-1.86) respectively.ConclusionThis meta-analysis showed that individuals with blood group A are at higher risk for COVID-19 infection while those with blood group O are at lower risk. Although the odds ratio of death for AB blood group was non-significant, it was considerable.

scholarly journals Relative Susceptibilities of ABO Blood Groups toPlasmodium falciparumMalaria in Ghana

2016 ◽  
Vol 2016 ◽  
pp. 1-4 ◽  
Author(s):  
Richmond Afoakwah ◽  
Edmond Aubyn ◽  
James Prah ◽  
Ekene Kwabena Nwaefuna ◽  
Johnson N. Boampong
Keyword(s):  
Falciparum Malaria ◽  
Blood Group ◽  
Malaria Infection ◽  
Blood Groups ◽  
The Other ◽  
Abo Blood Group ◽  
Abo Blood Groups ◽  
Blood Group A ◽  
Complicated Malaria ◽  
Group A

The clinical outcome of falciparum malaria in endemic areas is influenced by erythrocyte polymorphisms including the ABO blood groups. Studies have reported association of ABO blood group to resistance, susceptibility, and severity ofP. falciparummalaria infection. Individuals with blood group “A” have been found to be highly susceptible to falciparum malaria whereas blood group “O” is said to confer protection against complicated cases. We analyzed samples from 293 young children less than six years old with malaria in the Korle-Bu Teaching Hospital in Accra, Ghana. It was observed that group O was present in about 16.1% of complicated cases weighed against 40.9% of uncomplicated controls. Individuals with complicated malaria were about twice likely to be of blood groups A and B compared to group O (A versus O, OR = 1.90, 95% CI = 1.59–2.26,P<0.0001; B versus O, OR = 1.82. 95% CI = 1.57–2.23,P<0.0001). Blood group O participants with complicated diseases had low parasitaemia compared to the other blood groups (P<0.0001). This may give blood group O individuals a survival advantage over the other groups in complicated malaria as suggested. Participants with complicated falciparum malaria were generally anaemic and younger than those with uncomplicated disease.

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