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Environmental Contamination by Echinococcus granulosus sensu lato Eggs in Relation to Slaughterhouses in Urban and Rural Areas in Tunisia

Raja Chaâbane-Banaoues1, Myriam Oudni-M’rad1,*, Selim M’rad1, Habib Mezhoud1, Hamouda Babba1,2
The Korean Journal of Parasitology 2016;54(1):113-118.
Published online: February 26, 2016

1LP3M: Laboratoire de Parasitologie-Mycologie Médicale et Moléculaire, LR12ES08, Département de Biologie Clinique B, Faculté de Pharmacie, Université de Monastir, 1 Rue Avicenne, 5000 Monastir, TunisieJFIFddDuckydqhttp://ns.adobe.com/xap/1.0/ Adobed     ! 1AQa"q 2#w8B36v7XRr$9bCt%u&Ws'(xy4T5fH  !1AQaq"2B Rbr#u67Ѳ3sTt5v8Sc$4ĂCÔ%UӅFV ?_Aנj- H>>,m*>fzp"TrKkr^r.|_&]|*vPuܶvoQ1mwVJUhu-I"=LniAƕ8"۲ k*ҿ[yu:.vUQ+)%F DHyVBk>Hy8jݹ q~9D4KRmzQ)^ʔ.J%k_tVi5NTjg!'ky|5asOȻ)R۸ߩFMԿ3L4j6dڜ#NIwUF]JqB/(FafJRzq3\G՛ ?~\ 6)6W4m[O^L0E&rRMض*C .]Unl-1 1r#Rj/&QɈ׉˩s6Rj=5Tg.y.·Pӡ:JJS:C8-2u]d&vUz;7p9 5VnL֢"y)">iי(IDDd| Yj0; LRfS:ktYK%*N2^m|&dğth":ey)uPQZW)gcC3Pv&MMWd&Ŵ۲mvTRoժM03*F3Yd6\8,\hݻ kߔi<k NTwSԪmljj[>->ptU%'LR>&EBH$MQAUx[$Z6vi&_a.KIQ{hyƒ j"JOC9eFҝfj;˚Ω<[3_m% lQ@4g=5$(J]Yc-OMq<Ǎ wSzڗ)k$7VIP붾ͯnV+卵*t]iЎD31~SA1éC2u)ʼnQn-Uoi3:grI8ؓWm*G zܕ)ZקJ}Y YlGeJ6cB2I NS3Q>k=KTBT]W6+SOXQgGR? telˊ%-Re\hѯ2TF"C/OJΩ6r[N.0{SpljjX1“jOsӥ;ҭhe}xu`Ք&.)yO̒ Fߑ.$Qw;9Iw2o+RVJMSOj[SoҌZ%;`d$blQ{Ro{Imڌ>3egf\O֝Uzx"䢸g+mv%Gʆ:|V[N'&ס-ޝ'kfE|K,G&˳98Juin/\\Qݿ̋v~Ǩ!rtWU d|E߫R4d}.qPw*Ӭv5YEcn~f5c%MTMkb-F>5JT,})QHg%{("ӔȸWMsYyWNRrkkJr0XドnͫT}r-jj,Ŕʍ\Q2Ri>v$5!]"JB2WɅ)]VԜUc8i|.jeRO6^V.¸ Q&#|ܶ-*uOG%JAtRZRr]FFG\۩w+?'zչSѧt jz>KW&ot{7P&2D;&\\>Q2JzܗAKSfeNn[jRrԕf6,q,F1tRfԗ>vֶևj-&R'Zi2=xv~Elbsvm8=ӛ"ū񕜈BȩlWau[]ٷBߨF~J!|Ipr3R̴#Yp)={7:G{+:\W}n|Q#%)7^-h"Ƒq:M*%J&$T軨I333׎g_- ucBwwjp[6i25$̏bU’ٱRv?G\~#Iͪb7<<}Ezt" q_Inw,7-d,G÷%T* Wg1"䥱kq/A.,_KhqŒxwvo u2ۥۧ.bQ}XκA$֣ +K״ZUNmڸII{.v{5z5ѮRme[moyƾd~cRݾK'j.\i&/S6f|b=5: p!6i_ 4j6=.si˧eƾtS^c.Y^RJVS-Vi3,esi08?H$GvZgg?gi䤟2adw릿:"۪lkSN>q-4kI܋ێe̊qۅgDoѨ9; #T.Q;7#~_Ufstb_'w~Xw1Xk,vcOt._}v}8"(4Z\ۘgk?J?bm_c!g{HZV]Fkk%~gEt)b秴vΰB|꽸}mp~E6ݹv;7P٤v+ri*3Ԣ|'O14_~7nP{7ZU\Vű[ +7󖱅o#:ǥŬ\|3r%TJX]V7ez¨Y]lc|O3V! 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*Corresponding author (myriam.mrad@gnet.tn)
• Received: March 21, 2015   • Revised: December 6, 2015   • Accepted: January 11, 2016

© 2016, Korean Society for Parasitology and Tropical Medicine

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  • Hydatidosis has become a real concern for health care institutions and animal rearers in Tunisia. The Tunisian endemicity is aggravated by the growing number of dogs and the difficulty of getting rid of contaminated viscera because of the lack of equipment in most slaughterhouses. Therefore, microscopic and molecular tools were applied to evaluate the role of slaughterhouses in canine infection and Echinococcus granulosus sensu lato (s. l.) egg dissemination. Exposure risk to E. granulosus s. l. eggs in urban and rural areas was explored in order to implant preventive and adapted control strategies. Microscopic examinations detected taeniid eggs in 152 amongst 553 fecal samples. The copro-PCR demonstrated that 138 of 152 taeniid samples analyzed were positive for E. granulosus s. l. DNA. PCR-RFLP demonstrated that all isolated samples belonged to E. granulosus sensu stricto (s. s.). An important environmental contamination index (25.0%) by E. granulosus s. l. eggs was demonstrated. The average contamination index from the regions around slaughterhouses (23.3%; 95% CI: 17.7-28.9%) was in the same range as detected in areas located far from slaughterhouses (26.0%, 95% CI: 21.3-30.8%). Echinococcosis endemic areas were extended in both rural (29.9%, 95% CI: 24.8-34.9%) and urban locations (18.1%, 95% CI: 13.0-22.9%). The pathogen dissemination is related neither to the presence/absence of slaughterhouses nor to the location in urban or rural areas, but is probably influenced by human activities (home slaughtering) and behavior towards the infected viscera.
  • Key words: Echinococcus granulosus sensu lato, cystic echinococcosis, egg, slaughterhouse, environmental contamination, Tunisia
Hydatidosis or cystic echinococcosis is a cosmopolitan anthropozoonosis due to Echinococcus granulosus sensu lato (s. l.) metacestode [1]. Today it is recognized that E. granulosus s. l. includes 5 species, E. granulosus sensu stricto (s. s.) (genotypes G1 to G3), Echinococcus equinus (G4), Echinococcus ortleppi (G5), Echinococcus canadensis (genotypes G6 to G10), and Echinococcus felidis (lion strain) [2].
With a human surgical annual incidence (SI) averaging 12.6/100,000 inhabitants, Tunisia is one of the most endemic areas amongst the Mediterranean countries [3]. In Tunisia, the canine population, essentially represented by stray and semi stray (free-roaming dogs which are fed by an owner) dogs with high adult tapeworm prevalence, is estimated at about 800,000 animals [4]. Thus, considering that the average number of worms per dog is estimated at several thousands, dog feces cause a massive dissemination of the E. granulosus s. l. eggs in the environment [5]. Cystic echinococcosis is also worsened by the importance of pastoral livestock and the frequent infection of dogs by ingestion of raw infected ruminants’ viscera. Illegal and home slaughtering (in small restaurants on the roadside or during cultural and religious celebrations) is common in Tunisia. In the country, dogs are used primarily to guard livestock and property. They are often fed on the discarded offal of privately slaughtered livestock. Thus, 80.0% of butchers usually have an area behind their stores devoted to slaughtering animals and in the vicinity of 52.6% of them, a remarkable presence of stray dogs was noted [6].
Moreover, 38.4% of butchers and 44.0% of the population have no idea about E. granulosus s. l. transmission cycle. Therefore, their behavior is inappropriate concerning the management of infected offal [6-8]. People’s unawareness of the risks associated with the misuse of infected viscera increases the extension rate of hydatidosis and contributes to the public health problem in Tunisia [6]. Despite the health authorities’ efforts to control slaughterhouses, the destruction of infected viscera is not always an easy task, mainly due to the lack of equipments. The abundance of stray dogs around and inside slaughterhouses makes these efforts useless and increases their possibility of being infected [9].
Considering aspects related to public and animal health, the aims of this study were to evaluate the role of slaughterhouses in canine infection and E. granulosus s. l. egg dissemination and to explore the differences between environmental contamination by E. granulosus s. l. eggs and exposure risk in urban and rural areas, in order to implant preventive and adapted control strategies.
A total of 553 dog fecal samples were collected from the ground in 6 Tunisian regions: Monastir (hypoendemic area) and Sousse (mesoendemic area) situated in the North-Eastern region, Zarzis (hypoendemic region) in the South-Eastern region, and Metlaoui, Douz, and Tataouine (hypoendemic regions) in the South (Fig. 1). Isolates were collected from a portion of the feces disseminated over a soil surface of 200-400 m2. Total 219 isolates were taken from areas in the vicinity of slaughterhouses and 334 from distant areas (10-15 km). Feces were kept at least 1 week at -80˚C in order to inactivate the infective stages of the parasites. Helminth eggs were concentrated using the sucrose flotation technique with a specific gravity of 1.27 which is higher than the parasite egg densities (1.05-1.23) [10]. The presence of taeniid eggs was assessed using light microscope examinations. For positive samples, the cover-slip glasses were individually washed with 0.9% sodium chloride solution, and the elutes were stored at -20˚C until use.
Based on microscopic observations, taeniid eggs are morphologically indistinguishable from each other. Thus, the presence of E. granulosus s. l. eggs was ascertained by the Eg1121/1122 PCR, which permits to amplify a tandem repeat sequence, EgG-1HaeIII, specific to E. granulosus s. l. The presence of any of the 6 diagnostic bands (133, 300, 402, 600, 671, or 940 bp) described by Abassi et al. [11] revealed the presence of E. granulosus s. l. DNA. Briefly, genomic DNA was extracted using the phenolchloroform method subsequent to an alkaline lysis using dithiothreitol (Sigma, St. Louis, Missouri, USA) and KOH (PARK Scientific Limited, Northampton, UK) and an enzymatic digestion by proteinase K (Invitrogen, Darmstadt, Germany). PCR approach was realized as previously described by Naidich et al. [12] with the primer set Eg1121a for (5´-GAATGCAAGCAGCAGATG-3´) and Eg1122a rev (5´-GAGATGAGTGAGAAGGAGTG-3´). Thirty-five cycles of denaturation (95˚C for 60 sec), annealing (55˚C for 60 sec), and extension (72˚C for 60 sec) were carried out. PCR products were separated through 2% (w/v) agarose gel electrophoresis. The characterization of E. granulosus s. l. eggs was carried out based on PCR-RFLP assay developed by Hüttner et al. [13]. PCR-positive samples from all studied regions were subjected to PCR amplification of the complete nad1 gene sequence (1,071 bp), encoding the nicotinamide adenine dinucleotide dehydrogenase (NADH). PCR nad1 amplicons were then digested by HphI endonuclease as described by Hüttner et al. [13]. The genotyping of 6 isolates (1 sample from each studied region) was done using sequencing approach. Then, nad1 gene amplicons were purified and sequenced using the same set of primers that have been used in the PCR-RFLP assay (Eurofins MWG, Operon, Germany).
Descriptive statistics were used to determine whether the prevalence of E. granulosus s. l. eggs varies depending on the proximity of abattoirs and the location in rural or urban areas. The contamination index (% of dog feces positive for E. granulosus eggs) from isolates collected in different regions was analyzed with the Pearson´s chi-square test, using the SPSS software version 18.0 (SPSS Inc., Chicago, Illinois, USA). The level of significance was set at P<0.05. The difference between the parasite egg prevalence was calculated at 95% confidence interval (95% CI) (SPSS 18.0).
Microscopic examinations permitted detection of 152 isolates contaminated by taeniid eggs amongst 553 samples analyzed. Subsequently, the copro-PCR on these isolated taeniid eggs revealed that 90.8% of them were E. granulosus s. l. eggs. Thus, 138/152 analyzed samples presented at least 1 of the 6 bands described by Abassi et al. [11] (Fig. 2). PCR-RFLP demonstrated that all isolates were E. granulosus s. s. (Fig. 3). DNA sequencing revealed that the 6 samples analyzed were G1 genotype (GenBank accession no. KU169236 to KU169241).
Then, the contamination index was estimated at 25.0% (Table 1). Depending on the 6 studied regions, the contamination index varied from 10.5% to 42.3%. It ranged from 0.0% to 42.5% in sampling sites around slaughterhouses and from 0.0% to 46.5% in distant ones (Table 1). No relationship was observed between the studied regions and the contamination index distribution using the chi-square test (P=0.26). The highest contamination index (46.5%) (Table 1) was observed for the rural region of Metlaoui (south of Tunisia) which is far from slaughterhouses. Three urban (Sousse, Monastir, and Tataouine) and 1 rural (Monastir) locations were free of E. granulosus s. l. eggs (Table 1).
The average contamination index from the regions around slaughterhouses (23.3%, 95% CI: 17.7-28.9%) was in the same range as that detected in areas located far from slaughterhouses (26.0%, 95% CI: 21.3-30.8%) (Table 1). This observation was confirmed by the chi-square test attesting that the contamination index distribution was independent of the presence or absence of slaughterhouses (P=0.51). Amongst the 553 feces tested, 42/232 (18.1%) and 96/321 (29.9%) were contaminated by E. granulosus s. l. eggs in urban and rural regions, respectively. Whatever the site (near or distant from slaughterhouses), the samples from rural areas (29.9%, 95% CI: 24.8-34.9%) were more contaminated than those from urban areas (18.1%, 95% CI: 13.0-22.9%) (Table 1). However, this difference was not statistically significant (P=0.31), and the distribution of E. granulosus s. l. eggs was independent of the location in rural or urban areas.
This study was conducted to assess whether there is a relationship between the distribution of E. granulosus s. l. eggs and the sites of sampling (near or far from slaughterhouses and rural vs urban areas). The fecal samples presented a contamination index by E. granulosus s. l. eggs ranging from 10.5% to 42.3% depending on the studied regions which attests of the presence of human and animal infective life stage in the environment.
Areas distant from slaughterhouses presented contamination indexes similar to those in slaughterhouse areas (26.0% vs 23.3%). Dog’s behavior could be a key to understanding this contamination level in areas less likely to develop E. granulosus s. l. life cycle. Thus, the disease propagation model seems to be linked to dog displacement and not to the contamination source. In fact, dog feces are mainly deposited around the dog owners’ houses (from 0 to 200 m). This explains that wherever the dogs were infected, they often shed E. granulosus s. l. eggs close to their settlement [14].
Important contamination indices were detected in both rural and urban sites (29.9% and 18.1%, respectively). The distribution of E. granulosus s. l. eggs was independent of the location in rural or urban areas (P=0.31). Livestock are ubiquitous all over Tunisia especially in rural areas, and about 4 million sheep female units (FU), 705,520 goat FU, 426,590 cattle FU, and 17,000 camel FU are recorded [15]. Despite modernization efforts, animal breeding remains largely traditional which promotes animal infection by E. granulosus s. l. eggs and maintains an inexhaustible source of infected viscera for canids [4]. In rural areas, the dog density is 1 for 3.0-5.5 people, and 80.0% of households own at least 1 dog [16]. Rural population is not aware of zoonotic parasites that can be carried by their pets or the parasite transmission mode. A study conducted in Tunisian rural areas showed that 36.0% of surveyed people think that human infection occurs through the consumption of meat and only 30.0% of them blame dogs for the parasite transmission. Moreover, because of the high cost and the transport difficulty, the dead carcasses of infected ruminants are often left on the pasture accessible to dogs [8].
The current study has clearly demonstrated that the isolates from the urban regions (such as Monastir, Zarzis, and Tataouine) described as hypo- or meso-endemic regions [3] were contaminated by E. granulosus s. l. eggs. The hydatidosis extension may be due to the growing number of watchdog breeds and their close contacts with humans [1,17]. In urban areas, the habits of Tunisian modern population have changed regarding dogs, and the dog density is around 1 dog per 16 inhabitants [16]. Indeed, a few years ago, prohibition of keeping some dogs in Muslim houses limited the contact with them. Therefore, dog owners need to be aware of the potential dangers caused by their pets. Some simple precautions could be adopted to reduce the dangers and the incidence of dogs with E. granulosus s. l. such as the regular use of appropriate anthelmintic treatments, not feeding them with raw offal and not allowing them to access to dead animals’ carcasses [17].
Our results confirmed that, as is the case all over the world, E. granulosus s. s. (G1 genotype) is the most frequent species associated with human and animal cystic echinococcosis in Tunisia [18-20].
As a conclusion, the present study demonstrates the presence of an important contamination index of E. granulosus s. l. eggs in the environment. The pathogen dissemination is related neither to the presence or absence of slaughterhouses nor to the location in urban or rural areas, but it is probably influenced by human activities (home slaughtering) and behavior towards the infected viscera. Further studies are now required to determine the putative role of humans in the disease dissemination.

We have no conflict of interest related to this work.

This study was supported by the Ministry of Higher Education and Scientific Research, Tunisia. The authors thank Imen Hizem-Attig and Prof. Moncef Rassas for their assistance with the linguistic part of this paper. The authors are also grateful to Richard Scott for the last linguistic check of the manuscript.
Fig. 1.
Sampling collection sites in the different Tunisian studied locations.
kjp-54-1-113f1.gif
Fig. 2.
PCR products of the EgG1HaeIII tandem repeats specific to E. granulosus sensu lato. Lane M, molecular marker 100 bp DNA ladder (Invitrogen™); lane T, negative control (No-DNA); lanes 1, PCR products from E. granulosus protoscolex (positive control); lanes 2-13, PCR products of isolated taeniid eggs from canine faeces.
kjp-54-1-113f2.gif
Fig. 3.
PCR-RFLP banding patterns obtained by HphI digestion of the 1,071 bp product of the nad1 gene from Echinococcus granulosus egg isolates, producing visible fragments of 485, 320, and 204 specific to Echinococcus granulosus sensu stricto. M, Molecular marker 1 kb Plus DNA Ladder (Invitrogen™); lanes 1, negative control (undigested amplicon); lane 2-8, E. granulosus PCR-RFLP products.
kjp-54-1-113f3.gif
Table 1.
Echinococcus granulosus egg contamination index in fecal samples of dogs collected from urban and rural areas according to the distance between collection sites and slaughterhouses
Table 1.
Regions around slaughterhouses
 Regions distant from slaughterhouses
 Total (%)
Site locations No. of E. granulosus egg-positive samples/No. of fecal samples examined (%) Site locations No. of E. granulosus egg-positive samples/No. of fecal samples examined (%)
Monastir A1a 5/14 (35.7) Monastir S1b 0/13 (0.0) 9/59 (15.2)
Monastir S2b 4/20 (20.0)
Monastir S3a 0/12 (0.0)
Sousse A2a 0/20 (0.0) Sousse S4a 6/37 (16.2) 6/57 (10.5)
Zarzis A3b 6/22 (27.2) Zarzis S5b 4/23 (17.4) 22/80 (27.5)
Zarzis S6b 12/35 (34.3)
Metlaoui A4b 17/40 (42.5) Metlaoui S7b 20/43 (46.5) 52/123 (42.3)
Metlaoui S8b 15/40 (37.5)
Douz A5b 8/42 (19.0) Douz S9b 10/43 (23.2) 34/131 (26.0)
Douz S10a 16/46 (34.8)
Tataouine A6a 7/47 (15.0) Tataouine S11a 0/22 (0.0) 15/103 (14.6)
Tataouine A7a 8/34 (23.5)
Total 51/219 (23.3) 87/334 (26.0) 138/553 (25.0)

A, region around a slaughterhouse; S, square distant from slaughterhouses.

aUrban area.

bRural area.

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Environmental Contamination by Echinococcus granulosus sensu lato Eggs in Relation to Slaughterhouses in Urban and Rural Areas in Tunisia
Korean J Parasitol. 2016;54(1):113-118.   Published online February 26, 2016
DOI: https://doi.org/10.3347/kjp.2016.54.1.113
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Environmental Contamination by Echinococcus granulosus sensu lato Eggs in Relation to Slaughterhouses in Urban and Rural Areas in Tunisia
Korean J Parasitol. 2016;54(1):113-118.   Published online February 26, 2016
DOI: https://doi.org/10.3347/kjp.2016.54.1.113
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Environmental Contamination by Echinococcus granulosus sensu lato Eggs in Relation to Slaughterhouses in Urban and Rural Areas in Tunisia
Image Image Image
Fig. 1. Sampling collection sites in the different Tunisian studied locations.
Fig. 2. PCR products of the EgG1HaeIII tandem repeats specific to E. granulosus sensu lato. Lane M, molecular marker 100 bp DNA ladder (Invitrogen™); lane T, negative control (No-DNA); lanes 1, PCR products from E. granulosus protoscolex (positive control); lanes 2-13, PCR products of isolated taeniid eggs from canine faeces.
Fig. 3. PCR-RFLP banding patterns obtained by HphI digestion of the 1,071 bp product of the nad1 gene from Echinococcus granulosus egg isolates, producing visible fragments of 485, 320, and 204 specific to Echinococcus granulosus sensu stricto. M, Molecular marker 1 kb Plus DNA Ladder (Invitrogen™); lanes 1, negative control (undigested amplicon); lane 2-8, E. granulosus PCR-RFLP products.

Fig. 1.

Fig. 2.

Fig. 3.

Environmental Contamination by Echinococcus granulosus sensu lato Eggs in Relation to Slaughterhouses in Urban and Rural Areas in Tunisia
Regions around slaughterhouses
 Regions distant from slaughterhouses
 Total (%)
Site locations No. of E. granulosus egg-positive samples/No. of fecal samples examined (%) Site locations No. of E. granulosus egg-positive samples/No. of fecal samples examined (%)
Monastir A1a 5/14 (35.7) Monastir S1b 0/13 (0.0) 9/59 (15.2)
Monastir S2b 4/20 (20.0)
Monastir S3a 0/12 (0.0)
Sousse A2a 0/20 (0.0) Sousse S4a 6/37 (16.2) 6/57 (10.5)
Zarzis A3b 6/22 (27.2) Zarzis S5b 4/23 (17.4) 22/80 (27.5)
Zarzis S6b 12/35 (34.3)
Metlaoui A4b 17/40 (42.5) Metlaoui S7b 20/43 (46.5) 52/123 (42.3)
Metlaoui S8b 15/40 (37.5)
Douz A5b 8/42 (19.0) Douz S9b 10/43 (23.2) 34/131 (26.0)
Douz S10a 16/46 (34.8)
Tataouine A6a 7/47 (15.0) Tataouine S11a 0/22 (0.0) 15/103 (14.6)
Tataouine A7a 8/34 (23.5)
Total 51/219 (23.3) 87/334 (26.0) 138/553 (25.0)
Table 1. Echinococcus granulosus egg contamination index in fecal samples of dogs collected from urban and rural areas according to the distance between collection sites and slaughterhouses

A, region around a slaughterhouse; S, square distant from slaughterhouses.

Urban area.

Rural area.

Table 1.

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