Ecological interactions of sand flies, hosts, and Leishmania panamensis in an endemic area of cutaneous leishmaniasis in Colombia

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Authors:
Laura Posada-López , et al.

Abstract

1. Introduction

Leishmaniases are caused by trypanosomatids of the genus Leishmania, and approximately 20 species can cause different clinical manifestations in humans, including cutaneous, mucocutaneous, and visceral leishmaniasis [13]. This disease is endemic in 98 countries, and according to the World Health Organization (WHO), there are about 0.9–1.6 million new cases per year [4].

In the Americas, between 2001 and 2019, 1,028,054 leishmaniases cases were reported in 17 countries. Colombia presents a high transmission level, having the second highest incidence rate (per 100,000 inhabitants) after Brazil, reporting a total of 5,907 new cases in 2019, of which 98.7% were Cutaneous Leishmaniasis (CL) cases (PAHO/WHO) [5], followed in number by mucosal and visceral cases.

Cutaneous leishmaniasis is a neglected tropical disease, and a special public health problem, since although it does not cause mortality, it has a psychosocial impact on the population [6]. In America, CL has a variety of clinical forms ranging from localized ulcerated lesions, disseminated with papular lesions, diffuse with nodular lesions without ulcers, to mucocutaneous manifestations that mainly affect the nasopharyngeal mucosa [79].

In the neotropical region, 21 species of Leishmania have been recognized, of which at least 15 cause CL [7]. Colombia is also one of the countries with the highest Leishmania parasite diversity, with nine species reported affecting humans. However, CL outbreaks at intra- and peridomiciliary are mainly caused by L. panamensis, L. braziliensis, and L. guyanensis [1013].

According to the National System of Public Health Surveillance (SIVIGILA for its Spanish acronym), in the department of Caldas, a total of 975 CL cases were reported in the last five years (2017–2021), with an annual average of 195 new cases. Regarding the study of sand flies in this department, 34 species have been recorded [14]. Of those, species such as Lutzomyia gomezi, Lu. hartmanni, Lu. longipalpis, Pintomyia ovallesi, Pscychodopygus panamensis, Nyssomyia trapidoi and Ny. yuilli yuilli [1517], have been indicated as vectors based mainly on criteria such as anthropophilia, distribution coinciding with the disease, and abundance in the focus of transmission. However, there is a lack of studies on the behavior of sand flies in this region, where feeding habits, survival, and competition, among other criteria that lead to vector incrimination are analyzed.

The transmission dynamics of leishmaniases are complex given the high diversity of parasites, potential reservoirs and sand fly species possibly involved in the cycle. Consequently, studies about the ecological interactions of sand flies through the detection of blood sources could provide information on sand flies blood feeding choices [1822]. Further, this behavior could have an important role in the maintenance of the zoonotic transmission cycle of Leishmania [18, 21, 23, 24].

In Colombia, studies on the feeding habit of sand flies have been carried out mainly in visceral leishmaniases foci in the northern part of the country [2527]. Sandoval et al. studied some interactions between parasite, vector, and host in a CL focus in Eastern Colombia [28]. However, these types of studies in CL foci are scarce in the Andean region. In the department of Caldas, previous studies focused on the distribution and diversity of sand fly species [1517] without evaluating the role of these species in the transmission dynamics.

From this perspective, this study’s objective was to determine sand flies’ ecological interactions with Leishmania parasites and their blood sources (vertebrates in general) in an endemic area of CL. The interactions were investigated through DNA detections of the parasite and the vertebrate in sand flies collected intra- and peridomiciliary.

2. Materials and methods

2.1 Study area

In the last decade, the department of Caldas had an incidence rate ranging between 11.5 and 37.8 cases per 100,000 inhabitants, with an average annual incidence of 19.7 cases per 100,000 inhabitants (SIVIGILA). The municipality of Victoria presents an average annual incidence of 338.3 per 100,000 inhabitants (2011–2020), with peaks during the years 2011, 2013, and 2018; therefore, it is regarded as an area of intense transmission (PAHO/WHO) [5].

The study was carried out in the municipality of Victoria, in the Carrizales hamlet, located in the East of the department of Caldas (Fig 1). It is part of a subregion known as “Eje Cafetero,” which is part of the Andean region and is located in the Western and Central Cordilleras. According to the Holdridge life zones system, this region is characterized by tropical moist forests with mean annual temperatures above 24°C, rainfall around 4,000 mm yr−1, and elevations not exceed 1,000 m.a.s.l. [29]. The economy is based on traditional crops, mainly coffee, rubber, cocoa, sugarcane, citrus fruits, avocado, and livestock such as cattle [30]. Carrizales (5°32’8″N, 74°53’26″W) is a hamlet with widely scattered houses around 200 m apart. In a straight line, it is 4.2 km from the nearest urban area and by road 14 km from it. Some houses are very close to the forest (approx. 10 m).

For the captures, six houses were selected. The criteria considered for the selection were the occurrence of autochthonous CL cases during the six months prior to the study’s beginning and the favorable conditions for the development of the sand flies. One of the bedrooms of the dwelling represented the intradomicile. The area around the house, up to 20 m away from it, was considered the peridomicile, having small cocoa and rubber plantations and bordering with paddocks and forest at approx. 10 meters.

2.3 Molecular analyses: DNA extraction and PCR

After the specific identification of the female specimens and verifying their feeding condition (not engorged), the samples were grouped into pools according to species, date, and place of capture. The engorged females were processed individually.

DNA was extracted using SaMag Tissue DNA extraction kits (Sacace, Italy), which use the SaMag-12 automatic nucleic acid extraction system to extract genomic DNA (Samaga, Cepheid, Italy). The extraction process included lysis, binding, washing, and elution steps. A mechanical maceration step was initially necessary before following the DNA extraction protocol. Extracted DNA was stored at −20°C for amplification by Polymerase Chain Reaction (PCR) method.

2.3.1 Molecular detection of Leishmania DNA: PCR and RFLP.

A specific hsp70 gene fragment was amplified to detect the presence of Leishmania DNA in the samples, using the PCR-N (593 bp) protocols described by Montalvo et al. [33], employing the primers: F25 (5′-GGACGCCGGCACGATTKCT-3′) and R617 (5′- CGAAGAAGTCCGATACGAGGGA-3′). Negative controls were always included, along with positive controls consisting of 100 fg DNA from L. (Viannia) braziliensis strain UA301 and L. (V.) panamensis strain UA140.

For Leishmania species identification, the positive amplified products from PCR-N were digested simultaneously in a unique tube gathering restriction enzymes RsaI, BsaJI, HindII, and SduI, without prior purification. The Restriction Fragment Length Polymorphism (RFLP-PCR) analysis followed the protocol of Montalvo et al. [34]. Enzymatic digestion of PCR amplicons was performed in a total volume of 20μL. Each digestion contained ×1 optimal buffer (recommended by the manufacturer), 20μL of unpurified PCR product, respectively, and 2U of the enzyme. The reactions were incubated for 3 hours at 37°C (55°C for BsaJI). Restriction patterns were analyzed by electrophoresis in a 4% of agarose gel at 90V.

2.3.2 Blood-meal source identification.

A 215-bp fragment of the 12S gene fragment was amplified using primers L1085 (5′-CCC AAA CTG GGA TTA GAT ACC C-3′) and H1259 (5′-GTT TGC TGA AGA TGG CGG TA-3′) as described by Dumonteil et al. [35]. PCR products were purified and submitted for Sanger sequencing. Resulting sequences were edited in SeqTrace software and submitted to BLASTn for similarity search with sequences deposited in GenBank. The high-quality sequences were used to describe the blood-feeding source preferences of the sand flies. Blood meals were inferred using BLASTn against a curated dataset, considering a minimum of 95% identity and an e-value of 10 as a match. Once the probable source of blood (vertebrate) was identified, the geographic distribution of the species in the study area was corroborated.

2.5 Analysis of interactions between blood-meal sources, Leishmania and sand fly species

Circos plots [36] were used to show the interactions between sand fly species/blood-meal source/Leishmania and their frequencies. The analysis of the interactions was done descriptively. An χ2 -test was carried out to calculate significance (p<0.05) and used to compare captures in different environments and the proportion of females of different feeding statuses (engorged/not engorged) for each species. The analyses were carried out using the software PAST version 4.10, and the results were considered significant when p < 0.05. In order to estimate the infection rate in the positive samples for Leishmania, the minimum infection rate was calculated according to Paiva et al. [37] with the following formula: Minimum Infection Rate (MIR) = No. of positive groups (pools) × 100/Total of sand flies processed.

3. Results

Sand flies’ fauna and environment distribution

A total of 4,621 sand flies were collected in the sampling (3,511 females and 1,110 males). The specimens belonged to 20 species distributed in 11 genera. The most abundant species in the study area were Ny. yuilli yuilli (55.4%), Ps. ayrozai (14.5%), and Ps. panamensis (13.4%). The other species collected are summarized in Table 1.

Of the 3,511 females screened to determine the feeding status (with blood visible inside their digestive tracts), 116 (3.3%) were engorged. The number and frequency of females engorged by species are shown in Table 1. Ps. ayrozai was the species with the highest number of engorged females, and together with Ny. yuilli yuilli and Ps. panamensis account for 79.3% of the total. The caught engorged females represented 10 of the 20 species collected in the area, and among the predominant species, Ps. ayrozai showed the highest relative frequency (8.4%) (Table 1). By comparing the percentage of CDC traps-captured engorged females in the intra (2.6%) and peridomicile (2.5%), no significant statistical difference (p>0.01) was observed between the two environments. In the extradomicile, where the captures were made with Shannon traps, the rate of feedings was 17% (Table 2). When intra and peridomicile are compared, Ny. yuilli yuilli presented the highest relative frequency of engorged females in the intradomicile (statistically significant difference, p<0.05), while Ps. ayrozai presented the highest proportion of these females in the peridomicile (p<0.05). For Lu. bifoliata, Brumptomyia sp., and Psathyromyia (Pa.) shannoni, only one engorged female was collected in peridomicile. For the other species, there was no significant statistical difference between the frequency of engorged females in the intra and peridomicile (p>0.05).

Identification of Feeding sources

Of the 116 females detected with blood at screening, 72 were processed individually to identify the blood source. It was possible to amplify the 12S fragment for blood source detection in 47 samples, representing 65.3% of the total. Of the engorged females, which belonged to ten species, the blood source was characterized in nine of them. In the alignment of the sequences obtained from the positive samples, there was correspondence with several deposited in the GenBank, which allowed the identification of seven species of vertebrates as blood sources (S1 Table). We deposited representative sequences from Homo sapiens, Dasypus novemcinctus, Sus scrofa and Gallus gallus to the GenBank database (accession numbers OQ561787, OQ549920, OQ562001, OQ562002).

Humans were identified as a blood source in most samples, which was detected in seven sand fly species. Other blood sources identified corresponded to domestic animals: dogs, identified in Ny. yuilli yuilli and Ps. ayrozai representing (4.3%); chickens in Ps. panamensis (4.3%); unique samples that matched with cats in Ps. ayrozai; and pigs in Ny. yuilli yuilli. Regarding sylvatic animals, porcupines (Coendou sp.) were identified in Lu. hartmanni, and interestingly, 17% of the samples corresponded to armadillos, which were identified only in Ps. ayrozai (Fig 2).

thumbnail

Fig 2. Circos plot of the relationship between blood-meal sources, Leishmania, and sand fly species in Carrizales, Victoria (Caldas).

Tt, Triphopygomyia triramula; Pp, Psychodopygus panamensis; Pa, Ps. ayrozai; Ny, Nyssomyia yuilli yuilli; Nt, Ny. trapidoi; Lh, Lutzomyia hartmanni; Lg, Lu. gomezi; Lb, Lu. bifoliata: Br, Brumptomyia sp; Lp, Leishmania panamensis.


https://doi.org/10.1371/journal.pntd.0011316.g002

When analyzing the environmental distribution of the sand fly species and the blood sources identified, it was observed that of the 23 samples found with human blood, 17 (73.9%) were found in the forest. These samples were collected using Shannon traps with a light source and humans as incidental attractants. Ny. yuilli yuilli and Ps. ayrozai were the species with the most significant number of interactions with blood meal sources, both species bit humans in all environments. Other blood meal sources, such as dogs in the intradomicile and pigs in the peridomicile, were detected in Ny. yuilli yuilli.

4. Discussion

This work provides information on the diversity, ecology, feeding behavior, and natural infection of sand flies, which are key factors in understanding of the epidemiology of CL focus of the Carrizales hamlet. A high diversity (20 species) and low equitability in sand flies were broadly described. The marked dominance of Ny. yuilli yuilli, Ps. ayrozai, and Ps. panamensis represent a potential risk for Leishmania parasites transmission.

When comparing the distribution of the engorged females by the environment where these species were collected, a higher relative frequency was observed for Ny. yuilli yuilli in the intradomicile (80%, Table 2). This result suggests a high degree of anthropophily and an intradomiciliary biting behavior, which is consistent with previous studies that observed the anthropophily and the preference of this species for feeding indoors [38], which could be key factors in the transmission cycle characterization. On the other hand, the low relative frequency of engorged females of this species may be related to a higher activity of nulliparous females in search of a blood source [39], and CDC traps are not very attractive to engorged females given their tendency to move less than unengorged ones [40],

In the peridomicile, the highest frequency of fed females was observed for Ps. ayrozai (78%). When compared with the intradomicile frequency, the difference was statistically significant (p<0.05), which suggests that this species, although it enters the house, has a peridomiciliary biting habit. Differently, Ps. panamensis does not show a preference for a particular environment since no difference was found in the frequency of engorged females between intra and peridomicile.

For Ny. yuilli yuilli, although in this study its primary source was humans (83.3%), other hosts such as domestic dogs and pigs (Sus scrofa) were detected, suggesting an opportunistic habit, which is a characteristic that contributes to the vector potential of a species [41].

For Ps. ayrozai, a generalist behavior was also observed. Although humans were the primary blood source (52.4%), a wild host Dasypus novemcinctus (armadillo), and domestic animals such as dogs and cats were also identified (Fig 2). The preference of Ps. ayrozai for D. novemcinctus was also reported by Le Pont [42] and Rodrigues et al. [20] in French Guyana and the state of Roraima in Brazil, respectively. Here 12S sequences corresponding to the Dasypus genus were identified; however, the association with the armadillo species was made based on the distribution reported in the area [43]. This relationship is remarkable, considering armadillos are considered potential reservoirs of Leishmania spp, suggesting that Ps. ayrozai could act as a link species between a wild cycle and a domiciliary cycle (Fig 3).

This study observed a low frequency of dog blood, suggesting that dogs are not very attractive to the sand fly species collected, as previously reported [21, 44]. However, this could also be explained by the diversity of others blood sources available.

Concerning the blood sources in other sand fly species, the anthropophilic habit was detected in seven of the nine species analyzed, representing 68% of the blood sources. Humans were the only source identified in five species, Lu. bifoliata, Lu. gomezi, Ny. trapidoi, Trychopygomyia triramula (n = 2) and Brumptomyia sp. (n = 1). These results are essential to understand these species’ feeding behavior and propose epidemiological hypotheses about their role in the transmission of Leishmania spp.

Nowadays, the feeding habits of Lu. bifoliata are unknown. It was described as a very anthropophilic species [21]; however, this behavior was dismissed by Alexander et al. due to low frequency in the Shannon trap [17]. In our study, this species appeared sporadically in both intra and peridomicile. Human blood was identified in some females collected in the forest, confirming its anthropophilic behavior.

In the same way, Ty. triramula has been poorly studied. It has no known anthropophilic behavior and has previously been reported in armadillo burrows [45]. Rigg et al. [24] suggest that it is a generalist species feeding mainly on pigs, cows, dogs, goats, and birds. This species was gathered in all the collections in the present study, corroborating its positive phototropic behavior [46]. However, only one female was found engorged, and human blood was identified as a blood source (S1 Table), indicating a potential opportunistic behavior.

A single blood source was identified in Lu. hartmanni and Ps. panamensis, Coendu sp., and Gallus gallus, respectively. Lu. hartmanni appeared sporadically in our collections. For Ps. panamensis, Gallus gallus had already been reported as a blood-meal source [24].

A minimal infection rate (IMR) by Leishmania was detected in Ny. yuilli yuilli (0.58%) and Ps. ayrozai (1.16%). Both species were found in intra and peridomicile and the forest, identifying humans as the primary blood source (Fig 3). It is noteworthy that Leishmania DNA was detected in three females collected in house 2, where two cases of CL were recorded during the collection period.

Nyssomyia yuilli yuilli has been found with flagellates of Endotrypanum in sand flies from the Amazon region in Ecuador [47]. In Colombia, Ny. yuilli yuilli from the Andean region has already been found infected with L. panamensis in the department of Boyaca [38]. The present study reports the DNA detection of L. (V.) panamensis, this species, its habit of biting inside the house, and its marked anthropophily.

The detection of L. (V.) panamensis DNA in Ps. ayrozai is reported for the first time. This sand fly has been associated with armadillo caves and is a potential vector of L. naiffi [21]. Recent studies recorded females carrying out L. (V.) braziliensis and L. (V.) guyanensis DNA in the municipality of Rio Branco, in the state of Acre/Brazil [48]. This information highlights the need to study this sand fly to evaluate its role as a permissive vector of those Leishmania species.

Other sand fly species, including Lu. gomezi, Ny. trapidoi and Ps. panamensis were evaluated but did not show Leishmania DNA. However, they are being described as probable vectors of Leishmania spp. in other CL foci. Lu. gomezi is a recognized vector of L. (V.) panamensis in Panamá and Colombia [25, 38, 49] and L. (V.) braziliensis in Venezuela [50]. The importance of this species as a vector is increasing due to its ability to adapt to transformed ecosystems [25]. Ny. trapidoi is a highly aggressive anthropophilic species and the proven vector of L. (V.) panamensis in Panama and Colombia [51]. Ps. panamensis has been incriminated as a vector of L. mexicana [51], and other studies have detected it in Mexico infected with L. infantum [52] and in Ecuador with Leishmania major-like [53]. However, in this study, this species does not seem to play a relevant role in transmission in this focus.

Some limitations must be considered in interpreting the present study, including the convenient sampling and the low number of fed females analyzed to identify the blood-feeding sources. However, our results demonstrate the interactions between the sand fly species, host, and Leishmania parasite in the active focus of CL, bringing out evidence of the complexity of the transmission cycle in this region and the necessity for evaluating the role of sand flies in the transmission of L. panamensis. Additionally, these results contribute to understanding the ecological relations of the main component of the epidemiological triad of Leishmaniasis transmission, which is a crucial element to the development of prevention and control measures on an integrated management vector approach.

Future studies to explore the role of local mammals as possible reservoirs and essays to evaluate the vectorial competence and dispersal of Ny. yuilli yuilli and Ps. ayrozai are necessary to understand better the interactions and dynamics of Cutaneous leishmaniasis transmission

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