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REVIEW

Carbapenem Resistance in Animal-Environment-Food from Africa: A Systematic Review, Recommendations and Perspectives

Komla Mawunyo Dossouvi1 Department of Microbiology, DGlobal Health Research Institute, Lomé, TogoCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0003-0967-5314View further author information
ORCID Icon &
Ayawovi Selom Ametepe2 Department of Biological Sciences, University of Arkansas, Fayetteville, Arkansas, USAView further author information
Pages 1699-1728 | Received 06 Jan 2024, Accepted 25 Apr 2024, Published online: 03 May 2024

Abstract

Background

The World Health Organization (WHO) has classified carbapenem-resistant Enterobacteriaceae, Pseudomonas aeruginosa (P. aeruginosa), and Acinetobacter baumannii (A. baumannii) as high-priority pathogens, and carbapenem-resistant bacteria (CRB) have been reported to spread between humans, animals, and the environment.

Objective

This study aimed to conduct a systematic review of carbapenem resistance in animals, foods, and the environment on the African continent and to provide recommendations and perspectives for better prevention and control of carbapenem resistance in Africa.

Results

A total of 137 research articles collected from 2009 to 2023 were selected for this review, including articles reporting carbapenem-resistant bacteria in animals (81/137; 59.1%), the environment (66/137; 48.2%), and foods (26/137; 19%). Carbapenem-resistant bacterial species belonged to 31 genera and 17 families, including mainly Escherichia spp. (68/127; 53.5%); Klebsiella spp. (45/127; 35.4%); Pseudomonas spp. (20/127; 15.7%), Enterobacter spp. (19/127; 15%) and Acinetobacter spp. (15/127; 11.8%). The prevalence of CRBs by country ranged from 1.1% to 48.5%, and the pooled prevalence of CRBs isolated from animal-environment-food in Africa was 19.1% (2804/14,684; Standard Deviation = 15). Twenty carbapenemase families belonging to A, B, C, and D Ambler classes were reported, including mainly carbapenemase genes from blaOXA (44/84; 52.4%), blaNDM (34/84; 40.5%), blaSHV (23/84; 27.4%), blaKPC (22/84; 26.2%), blaVIM (19/84; 22.6%), and blaIMP (12/84; 14.3%) families. The reported mobile genetic elements (MGE) carrying carbapenemase-encoding genes included plasmids (16/19; 84.2%), integrons (3/19; 15.8%), transposons (3/19; 15.8%), and insertion sequences (2/19; 10.5%). blaOXA-48 was often carried by (60kb-65kb) IncL/M-type pOXA-48 plasmids, while blaNDM-5 was often carried by (45–50kb) IncX-type plasmids. Moreover, 25 articles investigated and reported virulent and hypervirulent CRBs that carried multiple virulence factors.

Conclusion

Animal-environment-food ecosystems would constitute reservoirs of CRBs involved in human infections. The One Health approach and constant collaboration between governments are necessary to drastically reduce the mortality rates linked to antimicrobial resistance.

Introduction

Carbapenems constitute a class of antibiotics of last resort against severe infections caused by multidrug- (MDR) and extensively drug-resistant (XDR) bacteria.Citation1–3 Unfortunately, carbapenem-resistant bacteria (CRB) are increasingly being reported worldwide, with several cases of CRB epidemics reported in all continents.Citation4–8 In addition, many cases of hypervirulent CRBs have been reported worldwide, making CRBs a real threat to public health.Citation9–11 Furthermore, the World Health Organization (WHO) classified carbapenem-resistant Enterobacteriaceae, Pseudomonas aeruginosa (P. aeruginosa), and Acinetobacter baumannii (A. baumannii) as high-priority pathogens.Citation12 In Africa, clinical CRB prevalence of up to 21% has been reported in certain countries.Citation13,Citation14

Carbapenemase production is the main mechanism causing carbapenem-resistance.Citation15,Citation16 Carbapenemases are molecules that break the beta-lactam ring, preventing the action of carbapenems.Citation16,Citation17 Carbapenemases are encoded by genes located mostly on mobile genetic elements (MGE) such as plasmids, integrons, and transposons.Citation18–20 In addition to carbapenemase genes, these MGEs often carry resistance genes for quinolones, aminoglycosides, and CTX-M extended spectrum beta-lactamase (ESBL) genes.Citation21–23

In addition to humans, CRBs have also been reported in animals (wild animals, companion animals, farmed animals, seafood, fish), foods (fruits, cooked foods, retail foods), and the environment (wastewaters, hospital environment, rivers, oceans).Citation24,Citation25 Animal and environmental ecosystems are powerful reservoirs that catalyze the occurrence of human CRB-associated infections.Citation24,Citation26–28 Therefore, the reservoirs and vectors of CRBs must be carefully considered.

Global surveys have shown that in 2019, antimicrobial resistance killed more people than HIV/AIDS or malaria.Citation29,Citation30 Therefore, improving surveillance, investigation, and in particular prevention of MDR- and XDR-associated infections must be a priority of public health authorities.

Thus, this study aimed to conduct a systematic review of carbapenem resistance in the animal-food-environment in Africa, and to provide recommendations and perspectives for better prevention and control of carbapenem resistance in Africa.

Materials and Methods

Literature Review

Keywords (carbapenem resistance, carbapenemase, food, animal, seafood, bird, fish, environment, Africa, country name) were used to perform a comprehensive literature search of databases (Google Scholar, African Journals Online, ResearchGate, PubMed, Embase, and Scopus). Articles published in both English and French were included to ensure comprehensive and relevant data. Animals, seafood, birds, and fish are grouped in “animal”.

Study Selection Criteria

Peer-reviewed research articles reporting carbapenem-resistant or carbapenemase-producing bacteria (CPB) collected in African countries were pre-selected for this study. After this stage, studies reporting CRBs or CPBs isolated from humans were excluded. Review articles reporting CRBs or CPBs collected in Africa were also excluded. Ocean water samples collected from the territorial oceans of African countries were also included in this study.

Data Extraction and Synthesis

The following data were extracted from every research article: country where the samples were collected, year of sample collection, isolated bacteria, prevalence of CRB or CPB, carbapenemase-encoding genes, virulence genes (if reported), mobile genetic supports carrying the carbapenemase –encoding genes, and references.

Statistical Analysis

Microsoft Excel 2016 was used for statistical analysis and graphical representation. p-values were obtained from the chi-square proportion comparison test at 5%, and the level of significance for all statistical tests was set at p < 0.05.

Results

Literature Search and Eligible Studies

A literature search of databases (Google Scholar, African Journals Online, ResearchGate, PubMed, Embase, and Scopus) generated 2879 research articles. Subsequently, 742, 1605, and 395 research articles were excluded for duplication, data outside Africa, and data collected from humans, respectively. The remaining 137 articles were included in this systematic review (). The data collected from 137 research articles are presented in .

Figure 1 Search flow diagram.

Figure 1 Search flow diagram.

Figure 2 Distribution of articles included in this review according to African regions.

Figure 2 Distribution of articles included in this review according to African regions.

Figure 3 Distribution of articles reporting carbapenem resistance by country.

Figure 3 Distribution of articles reporting carbapenem resistance by country.

Figure 4 Distribution of articles reporting carbapenem-resistant genera in African regions.

Figure 4 Distribution of articles reporting carbapenem-resistant genera in African regions.

Figure 5 Distribution of articles reporting the most prevalent CRB genera by country.

Figure 5 Distribution of articles reporting the most prevalent CRB genera by country.

Figure 6 Pooled prevalences of CRBs in Africa and Africa regions.

Figure 6 Pooled prevalences of CRBs in Africa and Africa regions.

Figure 7 Carbapenemase-encoding gene families detected in Africa in animals, the environment, and foods.

Figure 7 Carbapenemase-encoding gene families detected in Africa in animals, the environment, and foods.

Figure 8 Distribution of articles reporting carbapenemase families in animals, the environment and foods in Africa regions.

Figure 8 Distribution of articles reporting carbapenemase families in animals, the environment and foods in Africa regions.

Figure 9 Number of studies reporting OXA-carbapenemase-encoding genes.

Figure 9 Number of studies reporting OXA-carbapenemase-encoding genes.

Figure 10 Number of studies reporting SHV-carbapenemase-encoding genes.

Figure 10 Number of studies reporting SHV-carbapenemase-encoding genes.

Figure 11 CRB’s virulence genes reported in animals, the environment and foods in Africa.

Figure 11 CRB’s virulence genes reported in animals, the environment and foods in Africa.

Figure 12 Spread of CRBs between humans, animals, the environment, and foods in Africa.

Figure 12 Spread of CRBs between humans, animals, the environment, and foods in Africa.

Table 1 Informations Collected from the 137 Research Articles Included in This Review

Distribution of Articles

In total, 137 research articles were included in this review, including articles reporting CRBs from animals (81/137; 59.1%), the environment (66/137; 48.2%), and foods (26/137; 19%) (). Samples were collected between 2009 and 2023 (14 years). The North African region, with 53 articles, reported significantly more articles than the other regions (p < 0.0001). The North African region has mainly reported CRBs of animal origin (40/53; 75.5%), whereas the West African (25/39; 64.1%) and South African (10/13; 76.9%) regions reported mainly CRBs of environmental origin. The distribution of articles according to African regions is displayed in (). The number of studies per country ranged from 1 to 22, with an average of 5 articles per country (standard deviation = 6). The distribution of articles by country according to different ecosystems is shown in .

Samples Carrying Carbapenem-Resistant Bacteria

According to the articles included in this review, CRBs were isolated from animals (feces, fresh meats, pets, wild animals, farmed animals, cow milk), fish and seafood (tilapia, clams, bivalves, mussels), birds (meat and feces from poultry, migratory birds, urban pigeons), water (wastewater, tap water, fresh water, borehole water, ocean water, irrigation water, river water), soil (sediment, soil, manure), abattoir equipments and environment, foods (household foods, milk and dairy products, ready-to-eat meats, fresh vegetables, lettuce), insects (cockroach, human head lice), and even currency coins. In addition to these samples, 18 of 137 (13.1%) articles reported CRBs isolated from hospital environments (beds, surfaces, doors, taps, sinks, water, wastewater, and hospital devices).

Distribution of Carbapenem-Resistant Bacteria in Animal-Environment-Food

A total of 127 articles have reported the implicated carbapenem-resistant bacterial species. These carbapenem-resistant bacterial species belonged to 31 genera, including Escherichia spp. (68/127; 53.5%); Klebsiella spp. (45/127; 35.4%); Pseudomonas spp. (20/127; 15.7%), Enterobacter spp. (19/127; 15%), Acinetobacter spp. (15/127; 11.8%), Proteus spp. (6/127; 4.7%), Salmonella spp. (6/127; 4.7%), Staphylococcus spp. (6/127; 4.7%), Citrobacter spp. (5/127; 3.9%), Vibrio spp. (5/127; 3.9%), Burkholderia spp. (3/127; 2.4%), Serratia spp. (3/127; 2.4%), Pantoea spp. (2/127; 1.6%), Providencia spp. (2/127; 1.6%), Alcaligenes spp. (2/127; 1.6%), Shigella spp. (2/127; 1.6%), Raoultella spp. (1/127; 0.8%), Cronobacter spp. (1/127; 0.8%), Campylobacter spp. (1/127; 0.8%), Listeria spp. (1/127; 0.8%), Brucella spp. (1/127; 0.8%), Paenalcaligenes spp. (1/127; 0.8%), Morganella spp. (1/127; 0.8%), Stenotrophomonas spp. (1/127; 0.8%), Empedobacter spp. (1/127; 0.8%), Sphingomonas spp. (1/127; 0.8%), Kluyvera spp. (1/127; 0.8%), Aeromonas spp. (1/127; 0.8%), Pluribacter spp. (1/127; 0.8%), Bacteroides spp. (1/127; 0.8%) and Streptococcus spp. (1/127; 0.8%) (). Seventeen (17) families were represented, mainly Enterobacteriaceae, Pseudomonadaceae and Moraxellaceae. Xanthomonadaceae, Aeromonadaceae, Comamonadaceae, Chroococcaceae, Streptococcaceae, Enterococcaceae, Staphylococcaceae, Vibrionaceae, Alcaligenaceae, Bacteroidaceae, Sphingomonadaceae, Flavobacteriaceae, Campylobacteraceae and Burkholderiaceae were reported in minority. The distribution of articles reporting CRB genera by African region and country is shown in and , respectively.

Prevalence of Carbapenem-Resistant Bacteria

Ninety-five (95) articles out of 137 reported the prevalence of CRBs (the number of CRBs divided by the total number of bacteria tested). Variable prevalence was observed in countries, ranging from 1.1% to 48.5% (; ). The regional CRB mean prevalence included West African region (1323/4427; 29.9%; SD=18), South African region (423/1789; 23.6%; SD = 16.7), East African region (428/2303; 18.6%; SD = 16.2), Central African region (99/704; 14.1%; SD = 15.2), and North African region (531/5461; 9.7%; SD = 18.9) (). The prevalence of CRBs in West Africa was significantly higher than that reported in the 4 other regions (p < 0.0001). According to the 95 articles reviewed, the pooled prevalence of CRBs isolated in Africa from Animal-environment-food from 2009 to 2023 was 19.1% (2804/14,684; SD = 15) ().

Distribution of Carbapenemase-Encoding Genes

Eighty-four (84) articles investigated and reported carbapenemase-encoding genes belonging to A, B, C, and D Ambler classes (). Carbapenemase-encoding genes belonged to 20 carbapenemase families and included blaOXA (44/84; 52.4%), blaNDM (34/84; 40.5%), blaSHV (23/84; 27.4%); blaKPC (22/84; 26.2%), blaVIM (19/84; 22.6%), blaIMP (12/84; 14.3%), blaTEM (8/84; 9.5%), blaGES (8/84; 9.5%), blaCMY (7/84; 8.3%), blaACT (6/84; 7.1%), blaPER (3/84; 3.6%), blaIMI (1/84; 1.2%), blaMAL (1/84; 1.2%), blaPenA (1/84; 1.2%), blaSFO (1/84; 1.2%), blaSCO (1/84; 1.2%), blaPOM (1/84; 1.2%), blaCGB (1/84; 1.2%), bleMBL (1/84; 1.2%) and blaCcrA (1/84; 1.2%). The distribution of articles reporting carbapenemase families according to regions of Africa is shown in . shows the distribution of the carbapenemase families by country. In the OXA family, 27 variants that hydrolyze carbapenems have been reported, including mainly blaOXA-48 (28/88; 31.8%), blaOXA-23 (12/88; 13.6%), blaOXA-181 (7/88; 8%), and blaOXA-58 (6/88; 6.8%) (). Regarding SHV, 19 variants that hydrolyze carbapenems have been reported, including mainly blaSHV-11 (12/45; 26.7%), blaSHV-12 (6/45; 13.3%), and blaSHV-28 (6/45; 13.3%) (). Regarding NDM, blaNDM-1 (13/20; 65%), blaNDM-5 (6/20; 30%), and blaNDM-7 (1/20; 5%) have been reported. In addition, blaVIM-1 (5/13; 38.5%), blaVIM-2 (4/13; 30.8%), blaVIM-4 (2/13; 15.4%), blaVIM-5 (2/13; 15.4%) and blaKPC-2 (2/3; 66.7%); blaKPC-3 (1/3; 33.3%) were reported. Finally, blaCMY-2 (n = 7) was the only blaCMY variant reported.

Mobile Genetic Elements Carrying Carbapenemase-Encoding Genes

Nineteen (19) articles investigated and reported mobile genetic supports carrying carbapenemase-encoding genes, including plasmids (16/19; 84.2%), integrons (3/19; 15.8%), transposons (3/19; 15.8%), and insertion sequences (2/19; 10.5%) (). The reported plasmids carried blaOXA carbapenemase-encoding genes (8/19; 42.1%), blaNDM (6/19; 31.6%), blaKPC (2/19; 10.5%), blaVIM (2/19; 10.5%), and blaCMY (1/19; 5.3%) (). blaOXA-48 was often carried by (60–65kb) IncL/M pOXA-48 plasmids while blaNDM-5 was often carried by (45–50kb) IncX-type plasmids (). The reported integrons were class 1 and carried blaVIM-1 and blaVIM-2. The transposons identified were Tn2006 carrying blaOXA-23, Tn402 carrying blaVIM-5, and Tn4401d carrying blaKPC-3 ().

Virulent and Hypervirulent CRBs Isolated from Animal-Environment-Food

Twenty-five (25) articles investigated and reported virulent and hypervirulent CRBs that carried multiple virulence genes. These studies were from North Africa (14/25; 56%); East Africa (4/25; 16%); West Africa (3/25; 12%); South Africa (3/25; 12%) and central Africa (1/25; 4%) (). Almost all of these CRBs carrying virulence genes belonged to Enterobacteriaceae and were isolated from animal, environmental, and food samples. The virulence genes reported included adhesins (18/76; 23.7%) (fimH, mrkD, fimC, safC, eae, CsgA, Kpn, sefB); toxins (16/76; 21.1%) (Cnf1, hlyF, hlyA, CvaC, exoS/exoT/exoY, stx, elt/est, toxA, stn); iron acquisition systems (14/76; 18.4%) (entB, irp-1, iroN, kfu, ybtS, iutA, PAI IV536, fyuA); protectins (14/76; 18.4%) (iss, zapA, uge, ugeF, WabG, ipaH, kpsMTII, rfbE, flicH7, ompT); virulence factors involved in the metabolism, transcriptional and activation pathways (8/76; 10.5%) (ureA, ureC, cat2, paH, atpD, rsbA, aggR); secretion systems (4/76; 5.3%) (T6SS-I, T6SS-II, T6SS-III locus, siiA, spvC, spvB) and invasins (2/76; 2.6%) (invA, sopB/sopE) (). Moreover, many cases of hypervirulent K. pneumoniae (hvKp) strains have been reported.

Discussion

In this review, we reported the current state of carbapenem resistance in animal-environment-food in Africa based on a systematic review.

This review reported CRBs belonging to 31 genera and 17 bacterial families. This suggests that carbapenem resistance in animal-environment-food is not limited to certain bacterial families. Additional genomic investigations would identify more implicated carbapenem-resistant genera and families. In addition, the five most frequently reported bacterial genera were Escherichia spp. (68/127; 53.5%); Klebsiella spp. (45/127; 35.4%); Pseudomonas spp. (20/127; 15.7%), Enterobacter spp. (19/127; 15%) and Acinetobacter spp. (15/127; 11.8%). Sung et alCitation166 rather reported K. pneumoniae (45.9%), E. cloacae complex (29.3%), E. coli (13.5%), R. ornithinolytica (5.3%), and C. freundii (2.3%) isolated from the streams in Republic of Korea.

In this study, the pooled prevalence of CRBs isolated from animal-environment-food in Africa from 2009 to 2023 was 19.1% (2804/14,684; SD=15). The prevalence of CRBs in animal-environment-food in West Africa (1323/4427; 29.9%) was significantly higher than that reported by Dossouvi et alCitation13 in clinical CRBs from West Africa (1902/41,635; 4.6%) (p < 0.0001). It seems that in Africa, CRBs are more prevalent in animal-environment-food than in humans. This would confirm that animal-environment-food systems are reservoirs of CRBs. Our current data are insufficient to precisely determine the causes of the significant difference (p < 0.0001) between the prevalence of CRBs of animal-environmental-food origin in North Africa (531/5461; 9.7%) and in West Africa (1323/4427; 29.9%). Furthermore, the prevalence of CRBs among bacterial strains isolated from Chinese rivers (16.3%)Citation167 was similar to those obtained in the Central and East African regions in our study.

This review reported 20 families of carbapenemases involved in CRBs of animal-environment-food origin, including mostly carbapenemase-encoding genes from the blaOXA (44/84; 52.4%), blaNDM (34/84; 40.5%), blaSHV (23/84; 27.4%), blaKPC (22/84; 26.2%), blaVIM (19/84; 22.6%), and blaIMP (12/84; 14.3%) families. Worldwide, the prevalence trends of carbapenemase-encoding genes in animal-environment-food seem to be different from those observed in this review. In fact, the carbapenemase-encoding genes of CRBs isolated from South Korean streams were blaKPC (n = 37; 41.1%), blaNDM (n = 36; 40%), blaGES-5 (n = 10; 11.1%), and blaOXA-48 (n = 7; 7.8%).Citation166 In addition, blaNDM (50%) and blaKPC-2 (50%) were the most prevalent carbapenemase genes in CRBs isolated from Chinese rivers.Citation167 In Spain, Jiménez-Belenguer et al,Citation168 rather reported blaVIM (26.7%), blaIMP (23.6%), blaOXA-48 (17.4%), blaCMY-2 (8.1%), and blaKPC (4.3%) in CRBs isolated from fresh vegetables. Interestingly, SHV-type carbapenemases, which are often neglected in humans, are well represented (third rank) in animal-environment-food, with 19 variants in this study.

Several studies have precisely characterized the sequences of MGEs carrying genetic determinants of carbapenemases in this study. The international 60–65kb pOXA-48 plasmid reported in humans, animals, environments, and foods worldwideCitation169–172 has been reported a lot in this review. As in this study, 45–50kb IncX-3 type plasmids carrying blaNDM-5 have been worldwide reported in clinical CREs from Togo,Citation173 China;Citation174–176 retail meats samples from China,Citation177 and environmental samples from France.Citation178 As in this review, blaOXA-23 was reported in Tn2006 in clinical CRBs in ChinaCitation179,Citation180 and blaVIM-2 has also been reported in class 1 integrons in clinical CRBs isolated in South America and Asia.Citation181–183 It seems that MGEs carrying carbapenemase-encoding genes in clinical and animal-environment-food CRBs are similar or related. Comparative studies of clinical CRB genomes and CRB genomes of animal-environment-food origin would provide interesting conclusions.

This review also reported 25 articles that characterized virulent and hypervirulent CREs in animal-environmental-food. This is very concerning because these genetic determinants of virulence risk to be quickly transmitted horizontally to other bacterial populations as reported by previous studies.Citation184–188 If no major action is taken, Africa could experience outbreaks of hypervirulent CRBs, as is currently the case in Asia.Citation10,Citation11,Citation189–191 Like in this review, Ahlstrom et alCitation192 reported hypervirulent CR K. pneumoniae isolates from wild birds in Spain and Ukraine.

Recommendations and Perspectives for Better Control of Carbapenem Resistance in Africa

As global surveys show that in 2019, antimicrobial resistance killed more people than HIV/AIDS or malaria,Citation29,Citation30 improving surveillance, investigation, and in particular prevention of MDR- and XDR-associated infections must be a priority of public health authorities.

Prevention of Human CRB-Associated Infections

One of the objectives of this review was to provide comprehensive data that could help prevent human CRB-associated infections in Africa. Key reservoirs/samples included the hospital environments (beds, surfaces, doors, taps, sinks, water, wastewater, and hospital devices), currency coins, ready-to-eat meats, household meals, companion animals, water (well water, tap water, borehole water), milk and dairy products, fresh vegetables and lettuce, insects (cockroach, human head lice), and seafood (mussels, clams, bivalves) ().

CRBs disseminated in the hospital environment are the major cause of hospital-acquired infections (HAI).Citation193–196 Therefore, the eradication of CRBs from hospital environments will lead to a considerable reduction in the occurrence of HAIs. The hospital CRB reservoirs reported in this review included (beds, surfaces, doors, taps, sinks, water, wastewater, and hospital devices). It is therefore necessary to improve and adapt hand, surface, and hospital device cleaning protocols; improve the treatment of hospital wastewater; improve the microbiological quality of tap water distributed in hospitals; and prevent aerial dissemination of bacteria.

Moreover, it is necessary to systematically screen for CRBs in high-risk patients (patients from the intensive care units, patients with postoperative complications, hospitalized elderly and newborn patients, immunocompromised patients, and patients hospitalized in oncology and hemo-oncology departments). Finally, public health authorities will have to regularly improve awareness among healthcare staff and the population regarding appropriate and prohibited actions in hospitals.

In addition to the actions to be taken in hospitals, four actions seem imperative for the better prevention of CRB-associated infections (). First, public health authorities will need to improve public awareness regarding CRB reservoirs so that the population can adopt a hand-washing and hygiene habit, as several cases of CRBs have been reported on currency coins, pets, human head lice and cockroaches. Second, the population must be regularly made aware of the importance of cooking food properly and cleaning fruits and vegetables properly before consumption, since several cases of CRBs have been reported in household meals, fresh meat and fish, fruits, tomatoes, and lettuce. Furthermore, raw and undercooked mussels must be prohibited. Third, because several strains of CRBs have been isolated from well water, boreholes, and tap water, public health authorities will have to improve the microbiological quality of tap water, and the population will have to be better educated on water treatment techniques for wells and borehole water intended for consumption. Finally, several cases of ready-to-eat meals, milk and dairy products sold in supermarkets have been mentioned as CRB carriers. This is alarming because the aforementioned products, sold in supermarkets, are consumed without cooking. The policy of investigation and control of ready-to-eat meals and dairy products sold in supermarkets needs to be improved.

These preventive measures will undoubtedly improve the results of antimicrobial resistance control.

WGS as a Powerful Tool for Monitoring and Investigating Carbapenem Resistance in Africa

In this review, we assessed the current state of carbapenem resistance in animals, the environment, and food in Africa. However, it would be interesting to compare CRB strains of human origin to those of animal-environmental-food origin to identify the real sources, vectors, and platforms of propagation of CRB epidemics in humans. Hence, the WGS of CRBs is important.

WGS is a powerful tool for investigating, monitoring, and controlling antimicrobial resistance.Citation197,Citation198 Indeed, WGS provides exact information on sequence types, clonal and phylogenic origins, resistance genes, resistance mechanisms involved, virulence, metabolism, MGE, and mutations. Unfortunately, only 19 of 137 articles reported in this review (13.9%) performed WGS. It is clear that the maximum amount of information concerning CRBs was not reported in the 118 studies (86.1%) that did not perform WGS. Therefore, the actual extent of carbapenem resistance in animal-environment-food in Africa would be more staggering than the results reported in this systematic review. Therefore, we invite African research teams to use WGS techniques more frequently. We also invite African public health authorities to invest more in the acquisition of sequencing and bioinformatics platforms and the training of competent personnel. Finally, we invite funders to direct more funding towards studies including the WGS of bacterial strains isolated in Africa.

Conclusion

The data presented in this review confirm the generalization of CRBs in animal-environment-food ecosystems in Africa. Based on the data reported in this review, animal-environment-food ecosystems would constitute reservoirs of CRBs involved in human infections. However, further epidemiological and genotypic studies are required to gain better understanding. Currently, public health authorities should focus their efforts on preventing the transmission of CRBs from animal-environment-food ecosystems to humans and invest more in the acquisition and use of genomics platforms in Africa. The One Health approach and constant collaboration between governments are necessary to drastically reduce the mortality rates linked to antimicrobial resistance.

Abbreviations

CPB, carbapenemase-producing bacteria; CRB, carbapenem-resistant bacteria; CRE, carbapenem-resistant Enterobacteriaceae; ESBL, extended spectrum beta-lactamase; hvKp; hypervirulent Klebsiella pneumoniae; MDR, Multidrug-resistant bacteria; MGE, mobile genetic element; WHO, World Health Organization; XDR, extensively drug-resistant bacteria.

Author Contributions

All authors made a significant contribution to the work reported, whether that is in the conception, study design, execution, acquisition of data, analysis and interpretation, or in all these areas; took part in drafting, revising or critically reviewing the article; gave final approval of the version to be published; have agreed on the journal to which the article has been submitted; and agree to be accountable for all aspects of the work.

Disclosure

The authors declare that they have no conflicts of interest in this work.

Additional information

Funding

This study did not receive any funding.

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