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Epidemiology of Taenia saginata taeniosis/cysticercosis: a systematic review of the distribution in West and Central Africa

Parasites & Vectors volume 12, Article number: 324 (2019) Cite this article

Abstract

Background

The zoonotic tapeworm Taenia saginata, although causing only minor discomfort in humans, is responsible for considerable economic losses in the livestock sector due to condemnation or downgrading of infected beef carcasses. An overview of current knowledge on the distribution and prevalence of this parasite in West and Central Africa is lacking.

Methods

We conducted a systematic review, collecting information on published and grey literature about T. saginata taeniosis and bovine cysticercosis from 27 countries/territories in West and Central Africa, published between January 1st, 1990 and December 31st, 2017.

Results

The literature search retrieved 1672 records, of which 51 and 45 were retained for a qualitative and quantitative synthesis, respectively. Non-specified human taeniosis cases were described for Nigeria, Cameroon, Senegal, Burkina Faso, Democratic Republic Congo, Guinea, and Ivory Coast (seven out of 27 countries/territories), while T. saginata taeniosis specifically was only reported for Cameroon. Most prevalence estimates for taeniosis ranged between 0–11%, while three studies from Nigeria reported prevalence estimates ranging between 23–50%. None of the studies included molecular confirmation of the causative species. The presence of bovine cysticercosis was reported for Benin, Burkina Faso, Cameroon, Central African Republic, Chad, Democratic Republic Congo, Ghana, Guinea, Ivory Coast, Mali, Niger, Nigeria, Senegal, and Tristan da Cunha (14 out of 27 countries/territories). Prevalence estimates ranged between 0–29%.

Conclusions

Our systematic review has revealed that human taeniosis and bovine cysticercosis are seriously understudied in West and Central Africa. The high prevalence estimates of both conditions suggest an active dissemination of this parasite in the region, calling for a concerted One Health action from public health, veterinary health and food surveillance sectors.

Background

The tapeworm Taenia saginata is one of three Taenia species that infect humans as their definitive host, with bovines serving as the intermediate host. Humans acquire T. saginata infection after consuming undercooked beef containing viable cysticerci. The adult tapeworm resides in the small intestine, where it becomes patent within approximately ten weeks. At that moment, the strobila may have reached a length of up to three meters [1], and gravid proglottids can contain up to 100,000 taeniid eggs. These eggs are voided during and between defecation [2], and have the potential to survive for a long time without hatching. Eggs found in faecal material and eggs within soil have been documented to remain viable for up to 9.5 months [3]. Contaminated pastures, water and feed are a source of infection for cattle. Following ingestion, the early larval stages (oncospheres) hatch and the hexacanth larvae migrate, utilising the lymphatic and blood system, to the muscle tissue. Here the larvae mature into the metacestode stage, called cysticerci [4].

Unlike Taenia solium, for which humans can also act as a dead-end intermediate host leading to the debilitating and stigmatising disease neurocysticercosis, human T. saginata infections are restricted to the definitive (adult tapeworm) stage, which has a more limited public health burden. Taenia saginata taeniosis is generally asymptomatic or associated with mild abdominal discomfort, although more serious complications, including appendicitis, intestinal obstruction and gall bladder perforation have occasionally been documented [3]. Bovine cysticercosis, however, may result in substantial economic losses generated for the food industry because of meat condemnation, treatment processing costs and an overall reduction in the product value [5]. Moreover, the meat inspection process itself requires substantial (veterinary) public health sector investment and there are costs associated with treatment seeking behaviour, diagnostics, and treatment of human taeniosis cases [5, 6].

Taenia saginata is considered to have a global distribution, with higher prevalences in low-income regions where sanitation standards may be poor, and the meat inspectorate services are often poorly funded and understaffed.

In West and Central Africa, the cattle population amounts to 120 million heads [7]. While West Africa mainly consists of arid (and to lesser degree semi-arid and sub-humid) agro-ecological zones, Central Africa predominantly consists of humid zones (with some sub-humid zones as well) [8]. In the purely humid agro-ecological zones, cattle production is not considered an important economic activity due to the presence of diseases such as trypanosomiasis [8]. In the arid zones, pastoralism is the most commonly cattle production system, while the semi-arid and sub-humid zones in the area are characterized by mixed crop-livestock farming systems [8].

As a summary of existing knowledge on the occurrence of T. saginata taeniosis and bovine cysticercosis in the area is presently lacking, and as part of a coordinated effort to document the global distribution of T. saginata [9,10,11,12,13,14], we undertook a systematic review of the occurrence of this parasite in West and Central Africa.

Methods

Search strategy

We conducted a systematic review aiming to gather current knowledge on the occurrence, prevalence and geographical distribution of human taeniosis and bovine cysticercosis in West and Central Africa, published between January 1st, 1990 and December 31st, 2017. A complete study protocol is available in Additional file 1: Text S1. In the context of this study, West and Central Africa was defined as the area covering the following 27 countries/territories: Ascension, Benin, Burkina Faso, Cameroon, Cape Verde, Central African Republic, Chad, Republic of the Congo, Democratic Republic of the Congo (DR Congo), Equatorial Guinea, Gabon, The Gambia, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Mali, Mauritania, Niger, Nigeria, Saint Helena, Sao Tome and Principe, Senegal, Sierra Leone, Togo and Tristan da Cunha. Although Angola is classified as being part of Central Africa, it is also classified as being part of southern Africa, and data from this country were included in an equivalent systematic review of southern and eastern Africa [14].

The international scientific databases Web of Science (http://ipscience.thomsonreuters.com/product/web-of-science/) and PubMed (http://www.ncbi.nlm.nih.gov/pubmed) were searched using the following combination of key words: (cysticerc* OR cisticerc* OR “C. bovis” OR taenia* OR tenia* OR saginata OR taeniosis OR teniosis OR taeniasis OR ténia OR taeniid OR cysticerque) AND (Ascension OR Benin OR “Burkina Faso” OR Cameroon OR “Cape Verde” OR “Central African Republic” OR Chad OR Congo-Brazzaville OR DRC OR Congo OR “Cote d’Ivoire” OR “Equatorial Guinea” OR Gabon OR Gambia OR Ghana OR Guinea OR Guinée OR Guinea-Bissau OR Liberia OR Mali OR Mauritania OR Niger OR Nigeria OR “Saint Helena” OR Sao Tome OR Principe OR Senegal OR “Sierra Leone” OR Togo OR “Tristan da Cunha”). Moreover, databases for MSc/PhD theses and grey literature (Additional file 2: Text S2) were searched using the same search phrase. Furthermore, the OIE databases “Help with World Animal Disease Status” (“Handistatus”, 1996–2004) [15] and “World Animal Health Information System” (“WAHIS”, 2005) [16] were consulted to extract data on bovine cysticercosis for the study area. Finally, reference lists of relevant reviews were screened for additional records.

Selection criteria

The PRISMA guidelines were followed for reporting the review (Additional file 3: Table S1). Briefly, duplicate records were removed after compiling results from the different searches, followed by screening of titles and abstracts for relevance. Then, full text articles were evaluated using the following exclusion criteria: (i) studies concerning a parasite different from T. saginata; (ii) studies conducted outside the study area; (iii) studies published outside the study period; (iv) studies reporting results outside the scope of our review question (e.g. review, experiment, intervention); and (v) duplicated data. No language restrictions were implemented.

Data extraction and compilation

Data from included records were extracted. Where records reported both the numerator and denominator of the study sample, respectively, prevalence and 95% Wilson score confidence intervals (CI) were calculated. All calculations were conducted in R, version 3.5.2.

Results

Search results

In total, 1670 records were retrieved, including 1655 through database searching, while 17 additional records were identified, including 15 retrieved through reference list screening, and the OIE databases Handistatus [15] and WAHIS [16]. After the removal of duplicates, out of 1237 remaining records, 1235 underwent title and abstract screening (i.e. the abstract was unavailable for 2 records). Subsequently, full texts of 87 articles were assessed for eligibility, of which 51 articles were retained for the qualitative synthesis (45 journal articles, 3 conference abstracts, 2 databases, 1 letter to the editor), of which 45 were included in the quantitative synthesis (Additional file 4: Figure S1).

Human taeniosis

A total of 45 records described human taeniosis cases, of which 39 were included in the quantitative synthesis (Table 1). Out of 45 records, 35 describe results from Nigeria, 3 from Cameroon, 3 from Senegal, 1 from Burkina Faso, 1 from DR Congo, 1 from Guinea and 1 from Ivory Coast (Fig. 1). No data were available for the other countries in the study area.

Table 1 Reported occurrence of taeniosis in West and Central Africa
Full size table
Fig. 1
figure 1

Human taeniosis in West and Central Africa. The islands Tristan da Cunha (TDCA), Saint Helena (STHL) and Ascension (ASCN) are magnified (i.e. they are not shown according to the given scale) to improve presentation

Full size image

All studies included in the quantitative synthesis used plain stool microscopy as a diagnostic tool, and prevalence estimates for taeniosis ranged between 0–11% (0% in suburban schoolchildren [17] and 11% in community residents [18] both in Nigeria). Three other studies performed in Nigeria; however, they reported much higher prevalence estimates: 23% in primary schoolchildren [19], 33% in rural schoolchildren [17] and even 50% in pre-school-age children (aged between 0 and 71 months) [20]. In four other studies, excluded from the quantitative synthesis, the presence of T. saginata taeniosis was described for Nigeria, Ivory Coast and Senegal, without prevalence estimates [21,22,23,24]. A further two case reports were also excluded from the qualitative synthesis: the first case described the presence of Meckel’s diverticulitis due to T. saginata taeniosis in a 6-year-old girl in Nigeria [25], and the other a case of T. saginata taeniosis in a 33-year-old male presumably infected in Ivory Coast but diagnosed in Spain [26]. Only five studies reported the specific presence of T. saginata taeniosis; none of the studies mentioned morphological identification or molecular confirmation of the causative species, although one study conducted in Cameroon mentioned that species identification was done based on the expelled worm.

Bovine cysticercosis

Only 4 journal articles in addition to the 2 OIE databases described the presence of bovine cysticercosis in the study area, 3 of which were included in the quantitative synthesis (Table 2). The journal articles (1 described data for DR Congo, 3 for Nigeria) reported prevalence estimates based on abattoir surveys (i.e. meat inspection) between 0–29.0% (0% [27], 29% [28], both in Nigeria). One article, which was excluded from the quantitative synthesis, described the presence of bovine cysticercosis in Nigeria, without prevalence estimates [23].

Table 2 Reported occurrence of bovine cysticercosis in West and Central Africa: reports based on meat inspection
Full size table

In contrast with the journal articles, the OIE databases reported the (past) presence of bovine cysticercosis in a larger part of the study area (Table 3). Overall, bovine cysticercosis was reported throughout the study area, except for Guinea-Bissau, Sao Tomé and Principe, and Togo, where it was declared to be absent [15, 16] (Fig. 2). No data were available for Ascension, Cape Verde, the Republic of Congo, Equatorial Guinea, Gabon, Gambia, Liberia, Mauritania, Saint Helena or Sierra Leone.

Table 3 OIE data on occurrence of bovine cysticercosis in West and Central Africa (1996–2005) [15, 16]
Full size table
Fig. 2
figure 2

Bovine cysticercosis in West and Central Africa. The islands Tristan da Cunha (TDCA), Saint Helena (STHL) and Ascension (ASCN) are magnified (i.e. they are not shown according to the given scale) to improve presentation

Full size image

Discussion

Our aim was to gather current knowledge on human taeniosis and bovine cysticercosis in West and Central Africa. Overall, human taeniosis was reported in seven out of 27 countries/territories, while bovine cysticercosis was reported in 14 out of 27 countries/territories. This systematic review has revealed that human T. saginata taeniosis and bovine cysticercosis are seriously understudied in this region. While the study area consists of 27 countries and territories, the presence of human taeniosis and bovine cysticercosis were only described for 7 and 17 countries, respectively. For the remaining regions no data were reported. These findings are in contrast to eastern and southern Africa which have similar lifestyles yet a remarkably higher coverage [12]. This difference might be partially explained by the presence of a large French speaking population in West and Central Africa, and therefore potentially published research in journals which were not detected completely by our search strategy, although we had included French search terms and some articles in French were included in the present study. Another explanation might be a lower awareness and interest in the topic, as the cattle population in this area is somewhat lower as compared to eastern and southern Africa, i.e. 120 million heads [7] as opposed to 184 million heads [7].

Overall, the reported prevalence estimates of taeniosis were in line with those reported in eastern and southern Africa [12] and in the Americas [13], but higher than those reported in western and eastern Europe [9, 10]. In contrast to certain areas in eastern and southern Africa where consumption of raw beef is a culinary habit [12], traditional dishes in West and Central Africa include mainly stews with typically extended cooking times [29, 30], thereby decreasing the risk of exposure to viable T. saginata cysts. Three articles, however, reported very high taeniosis prevalence estimates, with 23% in primary schoolchildren [19], 33% in rural schoolchildren [17] and even 50% in pre-school-age children [20]. According to Adeniran et al. [20], Nigerian pre-school-age children are often fed undercooked meals for adults, including beef, in order to facilitate the transition from breastmilk to solid food. Should this high prevalence estimate be confirmed, such practices should be investigated and be the subject of close attention and education on the potential dangers associated with consumption of inadequately cooked food. In all taeniosis cases, species identification is pivotal to avoid the potential ingestion of T. solium eggs by the tapeworm carrier, and relatives and acquaintances, representing a risk of neurocysticercosis. Taenia solium is endemic in many of the included countries or territories [31,32,33,34,35,36]. Most studies, however, reported non-specified taeniosis, and for those specifically mentioning T. saginata taeniosis only one described the applied method. None of the other studies reported the use of specific morphological methods or molecular tools allowing for the identification of the causative Taenia sp. [9]. Hence, we cannot rule out that a certain proportion of taeniosis cases summarized in this review are due to T. solium instead of T. saginata.

A wide fluctuation in prevalence estimates, ranging between 10–30% for most studies [37] was observed for bovine cysticercosis, which is comparable to the estimates for eastern and southern Africa [12]. In many countries, meat inspection is not done systematically, especially in the case of backyard slaughtering in rural areas where meat inspection may not be available. Moreover, a correct estimation of the prevalence through meat inspection is hampered by its low sensitivity, which is estimated to lie below 16% [38]. This was confirmed by one study from Nigeria describing the prevalence of bovine cysticercosis in carcasses having passed the regular meat inspection at the abattoir. While the regular veterinary inspection declared the carcasses to be free from cysticercosis, investigators found a prevalence of 7.5% in carcasses originating from the same abattoir, sold at retail markets [27]. Overall, prevalence estimates for taeniosis of up to 50%, and for bovine cysticercosis of up to 30%, indicate the continued transmission of this parasite between cattle and humans. Despite the limited pathology caused by T. saginata, bovine cysticercosis has the potential to cause a high economic cost due to condemnation of infected carcasses. To interrupt transmission, stringent meat inspection procedures should be applied and improvements implemented in the sanitation and management of human sewage. The public should also be educated regarding general food safety measures such as thorough cooking of meat products, which also reduces the risk of infection with other microbiological hazards associated with meat products, such as pathogenic Escherichia coli, Salmonella spp., Mycobacterium bovis and Campylobacter spp.

Conclusions

Based on the findings of our systematic review, both human taeniosis and bovine cysticercosis are understudied in West and Central Africa. Included articles reported high prevalence estimates for both conditions, pointing to a continued transmission of T. saginata in the region. A One Health approach is needed to protect the general public from acquiring tapeworm infection.

Availability of data and materials

All references found eligible in our literature review are included in the article.

Abbreviations

CI:

confidence interval

DR Congo:

Democratic Republic of the Congo

OIE:

World Organisation for Animal Health/Office International des Epizooties

PRISMA:

Preferred Reporting Items for Systematic Reviews and Meta-Analyses

WAHIS:

World Animal Health Information System

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Acknowledgements

This work was performed within the framework of CYSTINET, the European network on taeniosis/cysticercosis, COST ACTION TD1302.

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Authors and Affiliations

  1. Department of Biomedical Sciences, Institute of Tropical Medicine, Antwerp, Belgium

    Emilie Hendrickx, Pierre Dorny & Veronique Dermauw

  2. International Livestock Research Institute (ILRI), P.O. Box 30709, Nairobi, Kenya

    Lian F. Thomas

  3. Institute for Infection & Global Health, University of Liverpool, Neston, UK

    Lian F. Thomas

  4. Department of Virology, Parasitology and Immunology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium

    Pierre Dorny

  5. Centre of Excellence for Food and Vector-borne Zoonoses, Institute for Medical Research, University of Belgrade, Dr Subotića 4, Belgrade, 11000, Serbia

    Branko Bobić

  6. One Health Center for Zoonoses and Tropical Veterinary Medicine, Ross University School of Veterinary Medicine, P.O. Box 334, Basseterre, Saint Kitts and Nevis

    Uffe Christian Braae

  7. Department of Infectious Disease Epidemiology and Prevention, Statens Serum Institut, 2300, Copenhagen, Denmark

    Uffe Christian Braae

  8. Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium

    Brecht Devleesschauwer & Sarah Gabriël

  9. Department of Epidemiology and Public Health, Sciensano, Brussels, Belgium

    Brecht Devleesschauwer

  10. Institute of Parasitology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland

    Ramon M. Eichenberger & Paul R. Torgerson

  11. Veterinary Research Institute, Hellenic Agricultural Organisation Demeter, Thermi, 57001, Greece

    Anastasios Saratsis

  12. Department of Food Safety and Infection Biology, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway

    Lucy J. Robertson

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  1. Emilie Hendrickx
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Contributions

EH and VD conducted the systematic review of literature, extracted and analysed the data, and drafted the first version of the manuscript. All authors contributed to the design of the study, interpretation of the data and writing of the paper. All authors read and approved the final manuscript.

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Correspondence to Veronique Dermauw.

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Hendrickx, E., Thomas, L.F., Dorny, P. et al. Epidemiology of Taenia saginata taeniosis/cysticercosis: a systematic review of the distribution in West and Central Africa. Parasites Vectors 12, 324 (2019). https://doi.org/10.1186/s13071-019-3584-7

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Keywords

Parasites & Vectors

ISSN: 1756-3305

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