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8 January 2021

Atlantic Forest Malaria: A Review of More than 20 Years of Epidemiological Investigation

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1
Unidade de Medicina Tropical, Universidade Federal do Espírito Santo, Vitória 29047-105, Brazil
2
Global Health and Tropical Medicine, Instituto de Higiene e Medicina Tropical, Universidade NOVA de Lisboa, 1349-008 Lisboa, Portugal
3
Instituto de Medicina Tropical de São Paulo, Universidade de São Paulo, São Paulo 05403-000, Brazil
4
Superintendência de Controle de Endemias do Estado de São Paulo, São Paulo 01027-000, Brazil
Microorganisms2021, 9(1), 132;https://doi.org/10.3390/microorganisms9010132
This article belongs to the Special Issue Malaria in Non-Endemic Areas: Diagnosis, Therapy and Epidemiology
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Abstract

In the south and southeast regions of Brazil, cases of malaria occur outside the endemic Amazon region near the Atlantic Forest in some coastal states, where Plasmodium vivax is the recognized parasite. Characteristics of cases and vectors, especially Anopheles (Kerteszia) cruzii, raise the hypothesis of a zoonosis with simians as reservoirs. The present review aims to report on investigations of the disease over a 23-year period. Two main sources have provided epidemiological data: the behavior of Anopheles vectors and the genetic and immunological aspects of Plasmodium spp. obtained from humans, Alouatta simians, and Anopheles spp. mosquitoes. Anopheles (K.) cruzii is the most captured species in the forest canopy and is the recognized vector. The similarity between P. vivax and Plasmodium simium and that between Plasmodium malariae and Plasmodium brasilianum shared between simian and human hosts and the involvement of the same vector in the transmission to both hosts suggest interspecies transfer of the parasites. Finally, recent evidence points to the presence of Plasmodium falciparum in a silent cycle, detected only by molecular methods in asymptomatic individuals and An. (K.) cruzii. In the context of malaria elimination, it is paramount to assemble data about transmission in such non-endemic low-incidence areas.

1. Introduction

Plasmodium vivax, Plasmodium falciparum, and Plasmodium malariae are the most common etiologic agents of human malaria in the Americas. Brazil registered 194,271 cases in 2018 [1], placing the country in second place in a list of malaria frequency in these regions [1]. Cases of P. vivax infection are the most common, and the Amazonian region is the most affected area in the country, with 99% of occurrences. The cases originating from transmission in the extra-Amazonian regions of Brazil constitute only 1%, with discrete clinical presentations reported every year and a particular transmission cycle [2,3]. Efforts to control malaria until the 1960s were focused in urban areas, and these measures left behind the dense Atlantic Forest (Figure 1) that was neglected by health authorities. Bromeliad-malaria is the name of the disease in such areas because the mosquito vectors use the collection of water in the axils of Bromeliaceae plants to reproduce [4]. Endemic areas are relatively frequent in the rural communities located in the coast of southeastern Brazil, and P. vivax is the parasite responsible for human infections. However, it is important to stress that there are also records of P. malariae and P. falciparum infections, albeit in a lower proportion [2,3,5,6].
Figure 1. Map of Brazil, with the Brazilian Amazon in light green and the Brazilian Atlantic Forest in dark green: darker areas in the Atlantic Forest correspond to remaining forest fragments [7].
Bromeliad-malaria is transmitted in the Atlantic Forest system by mosquitoes of the Kerteszia subgenus, with Anopheles (Kerteszia) cruzii being the most abundant [8,9,10,11,12]. Infections can occur in hosts that are blood meal sources for the mosquitoes generally located on the top of trees because of the acrodendrophilic behavior of these insects (the tendency of certain wild species to live and preferentially feed in the canopy). When these mosquitoes come down to lower heights, they feed on non-usual hosts such as humans. The acrodendrophilic behavior of An. (K.) cruzii is well documented, but several studies have shown that this species may also occur in high densities at ground level in the forest, including infected specimens [13,14].
The transmission cycle in this region does not fit the traditional malaria cycle, as cases occur at large distances from each other and are often separated by several weeks. The existence of a zoonosis, with infected simians participating in the epidemiology, is hypothesized (Figure 2). Despite Plasmodium simium and Plasmodium brasilianum being implicated as the etiologic agents of simian infections, several studies have suggested that P. vivax and P. malariae are the same species as P. simium and P. brasilianum, respectively, based on their genetic and morphological similarities [15,16,17,18,19].
Figure 2. Scheme of the transmission cycle of bromeliad-malaria that is hypothesized at the Atlantic Forest biome.
The problem of malaria zoonotic transmission was first seriously considered regarding Plasmodium knowlesi in Southeast Asia [20]. It was again reinforced when a natural transmission of Plasmodium cynomolgi became known in 2011 in Malaysia [21]. If the sustainable development goals are to be achieved concerning malaria elimination, such areas of zoonotic transmission should be addressed properly as they are not responsive to standard control measures, precluding achievement of the goals by 2030.
Additionally, the ecosystem balance, involving sustainable use of natural resources and preservation of ecologic niches, is necessary to preserve the well-being of populations under the One Health concept. Therefore, any control activity aiming to interrupt a zoonotic transmission should not interfere with the abovementioned balance, especially in a country where the disease is a significant public health problem.
Several studies have been conducted by different groups from the Brazilian states affected by this form of autochthonous malaria. Some consider the disease a focal zoonosis that occasionally appears, for example, in tourists that visit the forest for leisure and end up being infected by simian parasites [22,23]. However, in other settings, bromeliad-malaria continues to be reported in native inhabitants of rural cities every year, often in people that have never left the areas where they were born but exert some kind of professional activity inside the forest [2,3,5]. These differences between the transmission sites are being better understood now as epidemiological studies have used molecular tools to differentiate the parasites found in the three Plasmodium hosts (mosquitoes, simians, and humans) in these regions of Brazil [5,24,25,26].
Although a lot of knowledge has already been gathered, new questions have also been raised. This review intends to shed light upon the main aspects of bromeliad-malaria transmission, based on studies conducted using classical epidemiology, molecular epidemiology, and seroepidemiology since 1997.

2. Simian Plasmodia and Their Relationship with Human Malaria in the Atlantic Forest

The hypothesis that wild monkeys in the Atlantic Forest play an important role in the areas of residual malaria transmission has been suggested for many decades [27,28,29,30,31,32]. The existence of monkeys infected with P. brasilianum and P. simium, similar to the human parasites P. malariae and P. vivax, respectively, raises the possibility of a zoonosis occurrence in this biome, as suggested in some studies mainly involving howler monkeys (Alouatta guariba clamitans), the ones most frequently found infected [3,29,32,33].
Natural infection by P. brasilianum has been described in approximately 31 species of New World monkeys from Costa Rica to Brazil [25,29,34,35]. Additionally, some phylogenetic studies suggest that P. brasilianum represents an anthropozoonosis acquired by New World monkeys from humans who migrated from Africa [35,36,37,38].
Natural infection by P. simium has been described in howlers monkeys from Atlantic Forest, in Alouatta genera (Atelidae family) by Fonseca (1951), later in woolly spider monkeys (Brachyteles arachnoides) [29,39], and more recently in black-fronted titi monkey Callicebus nigrifrons (Pitheciidae family) [40] and the capuchin monkeys Sapajus xanthosternos and Sapajus robutus (Cebidae family) [41].
Regarding the zoonotic infection, the first human case described in Brazil occurred with a park ranger who participated in entomological collections in Serra da Cantareira, São Paulo municipality, and developed malaria by collecting mosquitoes in the canopy [42]. Plasmodium simium was then identified as the etiologic agent, and An. (K.) cruzii was identified as the vector. The clinical manifestations were mild and resolved spontaneously.
Since P. vivax is the main etiological agent in the Atlantic Forest, understanding the phylogenetic relationship between P. vivax and P. simium and their past population dynamics is crucial for characterization of the zoonotic picture. Genetic similarities between P. simium and P. vivax were reported in studies using sequences of genes such as the circumsporozoite protein (CSP) and merozoite surface protein 1 (msp-1), mitochondrial cytochrome b (cytb), and microsatellite molecular markers [15,16,17,18,19]. In addition, Costa et al. (2015) [43] conducted research with P. simium in southern Brazil, in the state of Santa Catarina, demonstrating recent transfer from human plasmodia to monkeys of the New World based on the genetic diversity found in the Duffy Binding Protein gene (PvDBP) sequences of these animals. Studies carried out with nuclear genes, CSP and 18S small ribosomal subunit (18S rRNA), as well as mitochondrial genes cytb and cytochrome c oxidase subunit I (cox) indicate a recent expansion of P. vivax [19]. They also demonstrate that genetic divergence within P. vivax is greater than genetic divergence between P. simium and some strains of P. vivax, suggesting a recent transfer between the two hosts [19].
Recent research suggested parasite transfer between monkeys and humans in the Atlantic Forest of Rio de Janeiro. Brasil et al. (2018) [22] and Alvarenga et al. (2018) [25] demonstrated that common haplotypes in parasite mitochondrial DNA in howler monkeys and human patients indicate that malaria behaves as an anthropozoonosis. They also proposed that these haplotypes could be used as markers to identify P. simium infection in humans. The same authors conducted a complementary study with samples of howler monkeys from Rio de Janeiro and identified a few single nucleotide polymorphism (SNPSs) that were suggested to be useful to distinguish P. simium from P. vivax [23].
However, other studies have shown the predominance of a typical P. vivax haplotype from the Amazon region in humans, simians, and anophelines in the Atlantic Forest and revealed the genetic diversity of P. simium/P. vivax* circulating in simian hosts, suggesting that identification of only a few SNPs may be not enough to distinguish these parasites [5,24].
A mitogenome analysis performed by Rodrigues et al. (2018) [24] strongly indicated the transfer of P. vivax from humans to monkeys and a low diversity of P. simium strains when compared to P. vivax strains from the Atlantic Forest and Amazon. However, it will be necessary to aggregate more data from wild primates, including other species, to infer the distribution of different strains in the Atlantic Forest. Altogether, the sum of evidence from the several studies cited suggests that P. simium and P. vivax are the same species.
Recently, Mourier et al. (2020) analyzed the complete genome of P. simium, showing that it is monophyletic and nested within the wider diversity of South American P. vivax. Interestingly, the same study also reported significant differences between P. vivax and P. simium in the genes encoding region 1 of the Duffy binding protein 1 (DBP1) and the reticulocyte binding protein 2 (RBP2a). The authors suggest that these changes in the key encoding erythrocyte invasion ligands together with other genetic changes possibly facilitated the transfer of P. simium to humans [44].
In recent years, studies of simian malaria have focused on the detection of Plasmodium in blood samples through an invasive process often harmful to wild specimens, usually causing injury or death during containment and anesthesia. Nowadays, alternative noninvasive methodologies have enabled safer and more effective screening, allowing the detection of parasite DNA using other types of samples, such as feces, urine, and saliva [38,45,46,47,48,49,50,51,52].
Diagnostic methods for simian and human malaria, through the analysis of DNA in feces, have been developed, allowing for sensitive detection of Plasmodium spp. and assuring that this diagnostic method is as effective as the one based on blood collection [48,49,51,53]. In Southern Brazil (state of Santa Catarina), in an area of Atlantic Forest, a study was carried out to diagnose simian malaria using fecal samples, and the results corroborated those of the previous studies in Africa and Asia [54].
Siregar et al. (2015) [49] analyzed infections in monkeys of the genus Macaca in Southeast Asia, in which it was possible to identify and quantify parasites (cytb gene). Those authors also inferred possible explanations for the presence of Plasmodium DNA in the feces: by passive entry into the stool via serum or into macrophage phagosomes in the host’s reticuloendothelial system or by the passage of free DNA from degraded parasites in the liver that fall into the feces through bile. Using an experimental malaria model, Abkallo et al. (2014) [55] identified rodent Plasmodium in the liver, bile, and feces after inoculation of sporozoites. The DNA found in the fecal material may reflect the chronicity of infections in the hosts, but it may not be related to the occurrence of the blood cycle.

4. Human Malaria

As previously mentioned, most of the malaria transmission in Brazil occurs in the Amazon region, comprising 99% of the total burden of the disease in the country. However, the minor participation of the Residual Malaria of Atlantic Forest Systems (RMAFS) in the total of cases is of importance due to its unusual ecology. Based on the accumulated knowledge to the present day, the overall consensus is that control for this type of malaria must not follow the same path as those actions planned for the traditional transmission cycle as it is highly unlikely that it could be controlled by a strategy based on indoor spraying or a track-and-trace approach.
The initial evidence of a different cycle of malaria transmission in areas of the Atlantic Forest came from a cluster of cases occurring in workers during railroad construction in the mountains of the São Paulo state in 1898 [80,81]. The sanitary authorities in Brazil had always dealt with malaria in lowland areas, where the recognized presence of An. (N.) darlingi seemed to be a prerequisite for the occurrence of human cases. However, under this scenario, the landscape was mountainous and the usually incriminated vector was absent. The sharp observation of the scientist Adolpho Lutz lead to the recognition of a different transmission cycle based on the breeding of a newly identified anopheline species, later called An. (K.) cruzii, in the bromeliads located at the canopy [4,80,81]. Given that malaria was a public health threat along the entire country in the first half of the twentieth century, the so-called “bromeliad-malaria” did not attract much attention from those involved in the fight against the disease. Considering the immense burden imposed by several millions of cases and hundreds of thousands of deaths, the RMAFS did not seem to be more than a curiosity, given its low occurrence and benign evolution [58]. RMAFS remained forgotten during the campaigns implemented along the sixties and the seventies, except for the intense activities of deforestation and removal of bromeliads from the forest in Santa Catarina state specifically designed to put an end to such type of transmission [58,73]. The success of the twentieth century campaigns in Brazil, motivated by the eradication effort promoted by the World Health Organization at that time, resulted in virtual elimination of malaria in the country, except for the Amazon region [82,83]. However, human cases in the forested areas in the south and southeast of the country continued to be reported.
The existence and the possible importance of RMAFS were considered again only in the early nineties through the work of Curado et al. [27] in the forested areas of São Paulo state. Based on the occurrence of 33 cases over two years in two districts, the authors detected IgG and IgM antibodies against Plasmodium antigens in blood samples collected from 277 individuals living in a varying distance from five to ten kilometers from case dwellings, which rarely inform on the typical malaria symptoms. The seropositive rate achieved 73% as the highest frequency. Those dwellers included either permanent residents or individuals from the city that used the countryside for rest on the weekends. The authors concluded that there was malaria transmission in that biome and that further studies would be necessary [27]. Again, in 2006, Curado et al. investigated two different areas of the same biome, collecting blood from 318 individuals [77]. Three individuals had IgM antibodies against P. vivax, and 18 individuals had antibodies against P. malariae. At the two sites, the percentage of IgG-positive individuals varied from 32% to 49% for P. vivax and from 16% to 19.3% for P. malariae. Unexpectedly, PCR-amplified fragments of Plasmodium DNA extracted from the blood samples were not only from P. vivax and P. malariae but also from P. falciparum parasites. One individual harbored the DNA of P. malariae, two of them had that of P. falciparum, and three presented a mixture of P. vivax and P. falciparum [77]. The latter was an unexpected finding, as it had neither been related to clinical cases nor been morphologically identified in the Atlantic Forest systems before.
In 2007, Cerutti et al. added more information about the RMAFS characteristics [2]. The authors collected blood from 65 individuals diagnosed as malaria cases from 2001 to 2004 in Espírito Santo state. All of them had positive thick blood smears for P. vivax. Successful PCR-amplification of a DNA fragment from the 18S small subunit (18S rRNA) gene extracted from 48 of the 65 samples disclosed P. vivax in 47 and P. malariae in the remaining [2].
Blood collection from the inhabitants living in a two-kilometer radius around the cases’ dwellings revealed a prevalence of IgM and IgG antibodies at 15.8% and 44.6% for P. malariae in 253 samples, 6.2% and 37.7% for P. vivax in 1701 samples, and 13.5% and 13% for P. falciparum in 192 samples, respectively [2].
PCR for the amplification of the 18S rRNA gene performed in 1527 samples collected from the dwellers disclosed silent infection for P. vivax in 23 samples, for P. malariae in 15 samples, for P. falciparum in 9 samples, and a mix of P. malariae and P. falciparum in one sample, totaling a prevalence of 3.1%. In that investigation, clinical cases predominated in men (78.5%), which may be related to the different working habits and higher exposure to infective mosquito bites. Such a characteristic coupled with the fact that recognized vectors were absent either from inside or near the houses, indicated, according to the authors, a probable extra-domiciliary transmission of the infectious agents [2]. Brasil et al. later confirmed most of these characteristics in Rio de Janeiro state, except for the profile of those affected tourists entering the forest, as opposed to the agriculture workers identified by Cerutti et al. [2,22].
De Alencar et al. further explored the occurrence of asymptomatic infections in the scenario of RMAFS in reports of 2017 and 2018 [84,85], reassessed part of the positive dwellers previously identified by Cerutti et al., and followed another cohort of residents for two years in the same region. Of the 37 carriers from the 48 detected between 2001 and 2004, PCR screening based on 18S rRNA gene amplification disclosed DNA of P. malariae in two, the same agent identified in their samples from 2001–2004 [84]. On the other hand, in the cohort of 92 individuals newly engaged in the two year follow-up, PCR revealed a prevalence of 3.4% of asymptomatic infections, with 2.3% for each one, i.e., P. vivax and P. malariae. During the two years, the authors found an incidence of 2.5 infections for 100 person-years or 1.25 infections for 100 person-years for each species. Additionally, de Alencar et al. observed that the positive individuals spontaneously reverted to a negative state without any therapeutic intervention. Mathematical modelling based on the frequency of asymptomatic infections and the vector density suggested that the transmission cycle could not be maintained only by the human reservoir in the region [85]. Miguel et al. added evidence to the case of asymptomatic infections through their survey in the Guarapimirim municipality in Rio de Janeiro state as they also detected a prevalence of 2.8%, reporting an association between incursions to the forest environment and the probability of being infected [86].
In summary, studies on RMAFS suggest that Plasmodium infection occurs mainly outdoors, originating from a nonhuman reservoir. Overall, symptoms of disease are mild to moderate, the cases are sparse, and there are no outbreaks. There is evidence of the involvement of P. vivax, P. malariae, and P. falciparum in the transmission cycle despite the absence of clinical cases caused by the latter.

5. Surveillance

The health facilities responsible for malaria diagnosis in the region belong to the Brazilian Unified Health System (Sistema Único de Saúde; SUS) offering free blood smear examinations for all those referred with fever. Malaria diagnosis is exclusively done by the public Brazilian Unified Health System, meaning that no other source of diagnosis exists in the private sector. As parasite density in the blood of those infected is usually low, rapid diagnostic tests (RDT) are of little help given their low sensitivity for low parasitaemia [87]. Morphological diagnosis through thick smears by health facilities always report infections as being P. vivax despite the high possibility that part of these cases are caused by P. malariae, instead. The epidemiological investigations performed in the affected areas used several molecular techniques, mainly PCR directed to the 18S rRNA gene, but also different techniques of DNA sequencing [5,26].
Recently, mitochondrial DNA sequencing raised several debates about putative evidence of a zoonotic cycle [5,22,23,24,25,26]. When comparing sequences generated by the sequencing systems with those deposited in GenBank and analyzing phylogenetic trees, some studies suggested a transfer of the parasites from the human host to nonhuman primates but not as a fully recognizable zoonosis. The genetic diversity of the parasites recovered from humans is higher than the diversity of parasites from nonhuman reservoirs, which may indicate a primary transfer from the humans to the simians [5,24].
Altogether, the only certainty to date is that malaria occurs in the Atlantic Forest systems as a process of transference between primate species (human and nonhumans). There is a movement of spillover and spillback for which intensity and direction are yet impossible to be fully characterized [Duarte et al., paper in press].

6. Concluding Remarks

A world without malaria has been the purpose of health authorities and researchers for a long time, all of them approaching the problem from the perspective of a transmission cycle encompassing mosquitoes and human beings. Consequently, these two components of the transmission became the primary targets of international efforts for malaria control. Once elimination would become a reality, spots of the disease sustained by unusual variables, as non-human reservoirs, can become sanctuaries of transmission. Such residual areas may act as a source to reintroduce the disease in the long term. That is why it is necessary to understand all the elements involved in those scenarios of unusual transmission and to design specific strategies for their containment. To tackle a complex disease like malaria, it is of utmost importance not to underestimate its capacity to resist elimination strategies.

7. Future Perspectives

Several aspects that represent unanswered questions regarding the transmission cycle of RMAFS must be further explored. More studies should clarify the role of P. falciparum in asymptomatic infections in this extra-Amazonian scenario. Additionally, the sustainability of transmission in the absence of the NHP reservoir deserves to be better investigated, taking the opportunity brought by the recent yellow fever epizootic (responsible for the death of approximately 90% of the Alouatta specimens in the biome). Finally, improved understanding of the genetic structure of the parasite species can foster our capability to develop preventive measures, such as biologic control strategies or vaccines. A world without malaria is possible, but its achievement will require the broadest understanding possible of several peculiarities of this complex infectious disease.
* The description of the species separated by “/” in this text means a lack of clarity regarding their status, i.e., both names may be designations of the same species.

Author Contributions

Conceptualization, A.P.A., J.C.B. and C.C.J.; data curation, J.C.B., C.C.J., F.E.C.d.A., A.M.R.d.C.D. and L.M.F.; writing—original draft preparation, J.C.B., C.C.J., F.E.C.d.A., A.M.R.d.C.D., L.M.F. and A.C.L.; writing—review and editing, J.C.B., C.C.J., F.E.C.d.A., A.M.R.d.C.D., L.M.F., A.C.L., B.F., C.R.V., M.M.M., P.C. and A.P.A.; figures production, A.C.L. All authors have read and agreed to the published version of the manuscript.

Funding

J.C.B. has a FAPES fellowship (grant number PROFIX10/20180. A.C.L. has a CNPq fellowship (grant number 302375/2020-1). We acknowledge Fundação de Amparo à Pesquisa e Inovação do Espírito Santo (FAPES, Brazil) (grant number 344/2018), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP, Brazil) (grant number 2014/10919-4), and Fundação para a Ciência e Tecnologia (FCT, Portugal) for funds to Global Health and Tropical Medicine (grant number UID/04413/2020).

Institutional Review Board Statement

Not applicable.

Data Availability Statement

No new data were created or analyzed in this study. Data sharing is not applicable to this article.

Conflicts of Interest

The authors declare no conflict of interest.

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