Blood transfusion is an operation that involves injecting blood or its derivatives into an individual by intravenous infusion. According to the WHO, blood transfusion is a treatment indicated to partially and transiently compensate for the deficiency of one or more components of blood tissue that would affect the patient’s survival  .
Blood transfusion is a medical procedure, which aims to bring blood or its derivatives to the patient. It is the result of a complex chain of activities in which different categories of medical and paramedic personnel are involved, therefore it cannot be considered an innocuous act. It remains tainted by many risks, which can be, infectious, immunological, hemodynamic and metabolic.
In order to combat these risks, transfusion safety (the set of measures to eliminate the immunological and infectious risks associated with transfusion of blood products) has been defined by the WHO, which has further clarified the 3 components main: blood availability, blood safety and judicious use of labile blood products  .
The transmission of infectious agents such as human immunodeficiency virus (HIV), viral hepatitis C (HCV), hepatitis B (HBS) and syphilis (RPR), poses a greater threat to the recipient’s transfusion safety. Blood transfusion is characterized in the majority of sub-Saharan African countries by a high prevalence of infectious agents  , a chronic shortage of blood in their blood pockets, and a lack of financial resources and skilled personnel.
In developing countries, many people die because of the lack of safe blood, even in some urban health facilities  . Blood transfusion saves lives and improves health, but millions of patients do not have timely access to safe blood due to a lack of reliable blood donors. Blood transfusions are an essential aspect of health care and everyone must have equitable access to uncontaminated blood  .
In sub-Saharan Africa, two factors reflect the difficulties encountered in waiting for optimal transfusion safety, the existence in the population of a high frequency of various infections, some of which are transmitted by blood transfusion and the still insufficient proportion of volunteer donors who make up the safest group  .
Because of its frequency and severity, the pathologies due to these 4 pathogens constitute a public health problem while blood transfusion is by far the main source of transmission of these agents especially HBV. In developed countries, the seroprevalence of HIV, HBV, HCV and T. pallidum among blood donors is 0.11%, 2.47%, 0.32% and 0.79% respectively  . Against 2% (HIV), 7.2% (HBV), 3.96% (HCV) and 0.70% (HCV) T. pallidum) in developing countries  .
As in other African countries, the Democratic Republic of Congo does not rule out this dangerous situation. The study conducted by Michel Kabamba et al. in 2012 entitled “Prevalence of Infectious Markers in Semi-Rural Blood Donors cases of Kamina Reference General Hospital”, HIV seroprevalence in this study was 2.9%  . In addition, Batina A. et al., through their study of infectious markers in donors in the Democratic Republic of Congo, revealed that HIV prevalence was 4.7% in Kisangani and the northern Democratic Republic of Congo was 5.6%  . For his part, Michel Kabamba et al. report an overall seroprevalence of 1.6%  of Hepatitis B among blood donors in rural Kamina (Democratic Republic of Congo). In another study, we the authors present a seroprevalence of hepatitis C of 0.2% and a seroprevalence of syphilis of 0.2%. The seroprevalence of hepatitis B virus in blood donors is 1.6% to 8.01%: Lubumbashi 8.01%  , Moba 3.9%  and Mbuji-Mayi 2.2%  .
2. Materials and Methods
The objective of this study is to contribute to improving the transfusion safety of blood products in Mbuji-Mayi by defining the prevalence and factors promoting the seroprevalence of infectious markers in blood donors Mbuji-Mayi and especially those of Kansele Hospital.
To carry out this study, we used the retrospective cross-sectional method using a preconceived data collection grid based on our study variables; we used the technique of documentary analysis. The study was conducted in a hospital setting, namely Kansele General Hospital, where data was collected using a data collection grid. The period of our research ranges from 12/01/2017 to 13/01/2018. That’s a year. All donors who were received and registered at Kansele General Hospital during the period covered by this study are the target population of this study. This hospital is chosen for its high capacity. Sample and sampling: In this study we used the non-probabilistic sampling method. The total population of this study is estimated at 522. The epi info 3.5.1 software had been used as an analysis tool. The following static measures will be calculated: frequencies to summarize categorical variables, central trend and dispersion measures to summarize quantitative variables. This was essentially the average around its standard deviation as the data were normally distributed.
After analyzing these results we draw conclusions that 85.4% of donors were male versus 14.6% female (a sex ratio H/F of 6.1) (Table 2).
The most proportion of respondents in this study had a blood group O or 52.3% followed by those in group A with 24.7% and those in the AB group were last with 1.5% (Table 3).
These results show that 4.4% of the respondents in this study were HIV-positive (HIV/AIDS) (Table 4).
This study found that 2.1% of respondents had a positive HCV status (Table 5).
After analysing this figure, 5.9% of respondents had a positive Hbs HIV status (Table 6).
Regarding the results of this study, 2.1% of respondents had a positive RPR status (Table 7).
Analysis of this graph shows that 52.7% had already donated blood more than once compared to 47.3% who were at their first donation (Table 8).
These results show that most donors in this study were familiar with 45.6%, followed by paid donors with 41.9% (Table 9).
Table 1. Répartition des enquêtés selon l’âge.
Table 2. Donor breakdown by sex.
Table 3. Distribution of donors by sex by blood group.
Table 4. Breakdown of respondents by HIV/AIDS HIV/AIDS status of blood donors.
Table 5. Breakdown of respondents by blood donor HCV serological status.
Table 6. Breakdown of respondents according to the Hbs Serological Status of Blood Donors.
Table 7. Breakdown of respondents by blood donor RPR serological status.
Table 8. Breakdown of respondents by number of donations already donated.
Table 9. Breakdown of respondents by donor categories.
After analysing our results, we found that 85.4% of our respondents were male versus 14.6% female. These results corroborate those of  who had shown that the majority of donors in his study were male, 94.4% and 5.6% female. These results are consistent with Tagny C.T. et al.’s observation that one of the common characteristics of blood donors in sub-Saharan Africa is the predominance of young male adults. The low proportion of women among blood donors is explained by numerous contraindications to blood donation including, among others, gestation, anemia, menstruation, breastfeeding, etc.  .
These results show that the prevalence of HIV among donors was 4.4%. After extensive analysis, we find that HIV/AIDS prevalence was high among young blood donors under the age of 21, or 10.5%, compared to 3.4% among those aged 21 to 45 and 7.8% among those over 45 years of age. The same is true for donors who were at their first donation with 8.5%. This prevalence was also higher among family donors with 8.0%. It should be concluded that young donors who are at first donation and who are in the family donor category are a category at risk of HIV/AIDS transmission among donors.
This prevalence remains lower than that reported in the Nigerian literature by 10.6%  ; 10.7% in Ethiopia  but this seroprevalence of HIV AIDS among blood donors was higher than ghana’s by 3.8%  .
These results are far superior to other studies such as  where HIV prevalence has a tendency to decline over time. However, the prevalence of HIV found in this study is higher than that of some African countries, 2.21% for Burkina Faso  , 2% for Tanzania  ; Eritrea  and northern India  where seroprevalence is 0.11%, 0.24% respectively.
This study found that 2.1% of respondents had the seroprevalence of Anti-HCV antibodies. This study shows that the association between certain characteristics of the respondents and the serological status of HCV was related only with the number of donations, those who were at their first donation had a seroprevalence of HCV of 4.5% while it was zero in donors who were at their second and more donation. These results are lower than J.M.’s Kabinda, et al. which shows that the analysis of the seroprevalence of HCV antibodies in its study was 3.8%  while it was in Central Africa at 3.6%, Angola it was 5.7% and Chad at 4.8%  . But it joins the average rate of hepatitis C in low-resource countries  .
This study also found that 5.9% of respondents had a seroprevalence of Hbs positive, the risk factor for HBV is that the prevalence of HBV was high in first-time donors (first donation) than in those who were at their second and more donations. The first blood donation is a risk factor for the transmission of infectious agents so this category is a very important priority for deep investigations. Those results although higher than those found by Michelle R. et al. by 4.2%  , but this study showed that this prevalence tended to rise over the years.
The seroprevalence of hepatitis B, found in other studies, is lower than ours, such as that of Mulubwa Kyalubile et al. who had shown a prevalence of 3.9%  ; which was within the range of seroprevalences reported by studies in our country     but far higher than that found by Kabamba Nzaji et al. in Lubumbashi (Michel et al., 2015).
Our results are also far below the rate found in some countries such as Nigeria (18.6%), Guinea Bissau (16.2%), Burkina Faso (14.96%). This can be explained by the simple fact that there is no HBV vaccination policy in our communities.
This study also showed that the most proportion of donors were family with 45.6%, followed by voluntary donors with 41.9%. These observations have also been noted in other studies. One example was Mulubwa Kyalubile et al., which reported that family donors were predominant with 65.95% and 0.02% of paying donors  .
Indeed, several previous studies around the world have shown that replacement donors (volunteers) are curiously paramount. In the study conducted by Singh et al., 82.4% were replacement donors  , 94.7%  in the Kakkar, N. et al. study while Sange and A. Pahuja et al. found 99.48%  . At the Provincial Centre for Blood Transfusion in Katanga Province, the trends seem to be identical to our results  and also to those obtained by Noubiap in Cameroon  . This indicates that much needs to be done to motivate and bring voluntary donors together through awareness campaigns about the importance of blood donations, conditions necessary to hope to meet the goals that the World Health Organization has set for itself.
Most of the respondents in this study had an O blood type, followed by those in group A with 24.7% and those in the AB group were last with 1.5%. We also noted that 79.3% of respondents were between 21 and 45 years of age, followed by those under or equal to 20 years of age.
Blood transfusion saves many lives during emergency medical care for people suffering from insufficiency in one or more constituents of the blood. Every recipient of the transfusion is exposed to the risk of accidents that may occur early or late. Transmission of infectious agents such as human immunodeficiency virus (HIV), hepatitis C (HCV), hepatitis B (HCB) and syphilis poses a greater threat to the recipient’s transfusion safety.
At the end of our study, we note that overall seroprevalences in blood donors at Mbujimayi were 4.4% respectively for anti-HIV antibodies; 5.9% for the anti-HBs antigen; 2.1% for HCV antibodies and syphilis-directed antibodies. Blood donors between the ages of 21 and 45 and male had HBS, HCV and HVB seroprevalence higher than other donors. Most donors with high seroprevalence were family donors who were at their first blood donation.
The seroprevalence of HBV was high among donors at first donation: 10.9% and 1.5% to those who were in their second and more donations. The family donor category had a seroprevalence of 8.8%, compared to 3.7% among voluntary donors and 3.1% among paying donors. Those who were at their first donation had a seroprevalence of HCV of 4.5% while it was zero among donors who were at their second and more donations.
HIV/AIDS prevalence was high among young blood donors under 21 years of age, compared to 3.4% among those aged 21 to 45 and 7.8% among those over 45. The same is true for donors who were at their first donation with 8.5%. This prevalence was also higher among family donors with 8.0%. It should be concluded that young donors who are at first donation and who are in the family donor category are a category at risk of HIV/AIDS transmission among donors.
The prevalence of these different infectious markers in our environment demonstrates that transfusion remains a major public health problem in countries that sends development in general and to Mbujimayi in particular and justifies systematic screening blood donors in the end to reduce the risk of transfusion.
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