Association of ABO and Rh Blood Groups with Helicobacter pylori Seropositivity in Gonabad City, Iran: A Case-Control Study

authors:

avatar Alireza Mohammadzadeh 1 , avatar Mohammad Hassan Minooeianhaghighi 1 , avatar Mohamad Ghorbani 2 , 3 , avatar Behdad Zibaee 2 , avatar Jafar Hajavi ORCID 4 , *

Department of Microbiology, Faculty of Medicine, Gonabad University of Medical Sciences, Gonabad, Iran
Faculty of Medicine, Gonabad University of Medical Sciences, Gonabad, Iran
Department of Pathology, Faculty of Medicine, Gonabad University of Medical Sciences, Gonabad, Iran
Department of Microbiology, Infectious Diseases Research Center, Faculty of Medicine, Gonabad University of Medical Sciences, Gonabad, Iran

How To Cite Mohammadzadeh A, Minooeianhaghighi M H, Ghorbani M, Zibaee B, Hajavi J. Association of ABO and Rh Blood Groups with Helicobacter pylori Seropositivity in Gonabad City, Iran: A Case-Control Study. Zahedan J Res Med Sci. 2023;25(3):e123100. https://doi.org/10.5812/zjrms-123100.

Abstract

Background:

Helicobacter pylori infection is one of the most common chronic bacterial infections in humans, affecting large populations worldwide.

Objectives:

The aim of this study was to investigate the relationship between H. pylori infection prevalence with ABO and Rh blood groups.

Methods:

This descriptive-analytical study was conducted with a case-control design on individuals with anti-H. pylori positive test. Patients with IgG pylori were included in the study based on the inclusion criteria. The individuals were divided into two groups based on antibody titer. The case group included subjects with positive serological results with a titer greater than 12 u/mL IgG, and the control group entailed subjects with negative serological results with a titer less than 8 u/mL IgG. The ABO and Rh blood groups of both groups were examined based on case information. Finally, the data were entered into the SPSS software, and a significance level of 5% was considered for all analyses.

Results:

According to the results of this study, there was no significant relationship between the blood group and H. pylori infection (P > 0.05). However, the prevalence of blood type A was significantly higher in individuals with positive H. pylori IgG test.

Conclusions:

The current study suggests no association between ABO and Rh groups, but people with A blood group infected with H. pylori need more attention.

1. Background

Helicobacter pylori is one of the most common bacterial pathogens in humans. This bacterium lives in the stomach and duodenum. It is one of the most important reasons for gastrointestinal diseases, such as chronic gastritis, peptic ulcer (stomach and duodenum), and gastric tumor (1, 2). The literature shows that around 4.4 billion people worldwide have been infected with H. pylori. North America (37.1%) and Australia (24.4%) reported the lowest prevalence rates, while Africa (79.1%), Latin America (63.4%), and Asia (54.7%) described the maximum prevalence of infection (3). The occurrence of H. pylori infection in diverse parts of Iran varies from 19.2% in Sari to 74.3% in Tehran (4).

Some characteristics of H. pylori bacteria play a role in infection, such as the colonization power of bacteria (motion, urease, and adhesion factors) and factors that cause tissue damage. These factors include lipopolysaccharide and cytotoxin vacuoleza A, a gene that codes cytotoxin and heat-sensitive proteins (5). Person-to-person transmission of this bacterium occurs in fecal-oral or oral form, and the prevalence of infections depends on age and economic status (6). Humans are important reservoirs of this bacterium, and the family is considered one of the main sources of infection transmission (7, 8). In many studies, environmental and lifestyle aspects (such as smoking and diet), as well as genetic factors, are considered important factors in increasing susceptibility to H. pylori infection (9, 10). One of the genetic risk factors is the expression of ABO blood group phenotypes in different people (11, 12). These bacteria identify and bind to blood group antigens expressed on the surface of gastric mucosa and play an important role in the stability of infection (13, 14). During colonization, H. pylori in the stomach bind to Lewis’s antigens and type 1 antigen of the gastric mucosa. H antigen has a carbohydrate structure, leading to the O phenotype in the ABO blood group system (15).

Although, during the last decade, some studies showed the relationship between ABO blood groups and H. pylori (16, 17), this association has not been observed in other investigations (13, 18). On the other hand, determining ABO blood groups may effectively assess the risk of H. pylori (11). Some studies have revealed a close relationship between the O blood group and duodenal ulcers, as well as blood group A and gastric carcinomas. However, the exact cause of these relations is unknown (19-21).

2. Objectives

This study was conducted to determine the association of ABO and Rh blood groups with H. pylori infection in patients referred to medical diagnostic centers in Gonabad city, Iran.

3. Methods

This cross-sectional retrospective, case-control study was performed after the approval of the proposal and after receiving the code of ethics. According to the study plan, people were referred to diagnostic centers in Gonabad in 2019 with positive anti-H. pylori IgG test results were included in the research. By reviewing the records of patients referred to medical diagnostic centers in Gonabad city with IgG serological test of H. pylori in 2019, based on previous studies (22), considering 95% reliability and 80% test power, and using G*Power software, the sample size in each group was obtained 115. The case group was patients with H. pylori-positive IgG test (titer greater than 12 u/mL), and the control group entailed people with H. pylori-negative IgG test (titer less than 8u/mL IgG). Due to the possible loss of the sample, the sample size was considered to be 240 people. The phenotypes of blood groups ABO and Rh (determined by direct hemagglutination using commercial monoclonal antibodies) were studied in two groups. Furthermore, the checklist for demographic information was completed.

3.1. Statically Analysis

After collecting and entering the data into the SPSS software, mean, standard deviation, frequency, and percentage of frequency were used to describe the variables. In analytical analysis, a chi-square statistical test was used to investigate the relationship between qualitative variables. Moreover, to compare quantitative variables, independent samples t-test, and Mann-Whitney test were used if the distribution was normal or not normal, respectively.

4. Results

This descriptive-analytical retrospective study was performed on 240 patients referred to Allameh Bohlool Laboratory of Gonabad University of Medical Sciences for an IgG test. Individuals in the case group had H. pylori positive tests, and those in the control group were negative for H. pylori IgG. In the case group, 52.5% (63) were female, and 47.5% (57) were male, and in the control group, 62.5% (75) were female, and 37.5% (45) were male. The mean age in the case and control groups was 8.21 ± 47.1 and 7.12 ± 49.07 years, respectively. The chi-square test indicated no significant difference between the groups in terms of gender (P > 0.05) and age (P > 0.05).

The percentage of frequency was higher only in groups A and O in the case group than in the control group, but the chi-square test showed no significant difference between the ABO blood groups in the two groups (P > 0.05) (Table 1).

Table 1.

Comparison of Case and Control Groups by Blood Group

Blood GroupsCase Group (%)Control Group (%)P-Value
A39.1636.66> 0.05
B30.8335.00
AB19.1621.66
O10.836.66

The chi-square test showed no significant difference between the number of Rh-positive and Rh-negative people in each group (P = 0.085). We found a significant relationship between smoking and H. pylori (P = 0.015), as the incidence of H. pylori was higher in smokers than in non-smokers. On the other hand, no significant relationship was detected between the place of residence and H. pylori infection (P > 0.05) (Table 2). However, the prevalence of H. pylori was higher in the villagers. Statistical analysis displayed a significant relationship between marital status and infection with H. pylori (P = 0.037), so the prevalence of H. pylori was higher in married people.

Table 2.

Comparison of Case and Control Groups in Terms of Rh

RhCase Group (%)Control Group (%)P-Value
Rh+71.6679.16> 0.05
Rh-28.3320.83

5. Discussion

The results of the present study showed that the frequency percentage of H. pylori infection was higher in blood groups A and O in the case group. However, no significant difference was observed between the ABO blood groups of the two groups. In addition, there was no significant difference between Rh-positive and Rh-negative blood groups. In recent decades, some studies have expressed a conflicting relationship between ABO blood groups and H. pylori (13, 16-18).

Keller et al. and Sharara et al. investigated the association between upper gastrointestinal diseases, ABO blood groups, and H. pylori infection in patients with a positive outcome of H. pylori infection based on the endoscopic outcome. They did not observe any significant relationship between different types of blood groups and the prevalence of infection with this bacterium (22, 23). The findings of the present study were similar to our study.

Inoue et al. (24) and Chakrani et al. (11) investigated the association between H. pylori infection and ABO blood groups. They reported that Helicobacter infection in blood group O was higher than in other blood groups. In our study, the infection rate was higher in groups A and O, but there was no significant difference. Reiisi et al. investigated the relationship between ABO/Rh blood groups. They compared the severity of H. pylori infection in patients who were Rh-positive and those who were Rh-negative. These authors found no relationship between bacterial infection and ABO blood groups (25). In line with this study, we observed no correlation between the Rh blood group and H. pylori infection. Aryana et al. assessed the relation of H. pylori infection with the prevalence of ABO and Lewis-synthesized blood groups. In line with our study, they did not indicate any significant relationship between H. pylori infection and ABO or Lewis blood groups (13).

Unlike our study, Kanbay et al. showed that people with blood groups A and O were statistically more susceptible to H. pylori infection and had a lower chance of developing an infection than people with the AB blood group (26). de Mattos et al. investigated the association of H. pylori infection with the ABO blood group and Lewis in 128 subjects. The results of their study were inconsistent with the present research and indicated that the prevalence of H. pylori infection was higher in patients with O blood group (27). Heneghan et al., in another study on 287 patients, similar to the present investigation, did not find any relationship between ABO blood group phenotypes and H. pylori infection (28). Moreover, in a study conducted by Loffeld and Stobberingh on 782 healthy blood donors, no significant association was detected to confirm that people with the O blood group were infected with H. pylori, which was similar to our results (29).

In the Loffeld and Stobberingh (29) survey, the prevalence of H. pylori infection among men and women was evaluated, and no significant difference was observed in the prevalence of infection with gender nor between infection with ABO and Rh blood group phenotypes. No significant difference was observed between genders in terms of infection prevalence and serological status of this infection with ABO and Rh blood group phenotypes, which was in line with our study. In a study conducted by Tadege et al., similar to our study, there was no statistically significant relationship between the serum prevalence of this infection and the phenotype of ABO blood groups (30). The contradiction between the results of different studies can be due to other factors that may also play a role in infection with H. pylori. The health status of the living environment, place of residence, age, lifestyle, number of family members, and any factors contributing to this infection should be studied alongside blood group phenotypes to generate more comprehensive results.

The results of the current study indicated that smoking can increase the risk of bacterial infection. Zeng et al., similar to the current study, reported a significant relationship between smoking and the severity of contamination. In addition, age and aging can exacerbate inflammation and bacterial localization (31). Monjamzadeh et al. observed no significant relationship between age and infection with this bacterium (32). Shahi et al. (33) and Li et al. (34) found no significant relationship between age and infection with H. pylori. The latter results were similar to the present study. On the other hand, Kim et al. observed a significant relationship between age and infection with this bacterium, which was contrary to our findings (35). The mentioned research, in line with our study, showed that smoking and pathogenic bacteria factors could increase the risk of infection with H. pylori.

5.1. Conclusions

Although some studies have indicated a relationship between blood groups and H. pylori infection, our findings did not show such a relationship. This may be due to the role of genetic and demographic factors that require further evaluation. Other influential factors may include lifestyle and the type of diet. Moreover, infection rates can vary due to differences in H. pylori strains.

Acknowledgements

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