Ecology of Rhodnius robustus Larrousse, 1927 (Hemiptera, Reduviidae, Triatominae) in Attalea palm trees of the Tapajós River Region (Pará State, ... View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2014-04-01

AUTHORS

Fernando Braga Stehling Dias, Marion Quartier, Liléia Diotaiuti, Guy Mejía, Myriam Harry, Anna Carolina Lustosa Lima, Robert Davidson, Frédéric Mertens, Marc Lucotte, Christine A Romaña

ABSTRACT

BACKGROUND: The rising number of acute cases of Chagas disease in the State of Pará, reported in the past two decades, has been associated, in part, with the ingestion of juice of local palm tree fruits, mainly açaí berry and bacaba. Near the study area, in Santarém, Pará State, an outbreak of Chagas disease has been notified and investigations suggest the consumption of bacaba juice as the main source of infection with T. cruzi. The purpose of this study is to assess the aspects associated to the ecology of Rhodnius robustus in palm trees of three communities of the Tapajós region, in the State of Pará, Brazil. METHODS: Palm trees were cut down and dissected to search for triatomines. DNA from triatomines was extracted to investigate natural infection by Trypanosoma cruzi and T. rangeli. For statistical analyzes, data from infestation of palm trees, as well as the rates of natural infection by T. cruzi and T. rangeli were compared by Chi-square test. Triatomine density values were analyzed by the nonparametric Kruskal Wallis test and then comparisons between each pair of variables were made by the Mann-Whitney test assuming a confidence interval of 95%. RESULTS: We dissected 136 palm trees, 60 at the end of the rainy period and 76 at the end of the dry period. Seventy-three of them (53.7%) were infested with triatomines and three species were found, namely: Rhodnius robustus, Rhodnius pictipes and Panstrongylus lignarius. We collected 743 triatomines, and R. robustus was predominant (n = 739). The identification of natural infection of the insects by trypanosomatids revealed that 125 triatomines were infected by T. cruzi, 69 by T. rangeli and 14 presented both parasites, indicating the presence of mixed infection in the same vector. CONCLUSION: The results suggest that São Tomé is the community with greater density of triatomines and infestation of palm trees; also, it demonstrates the existence of an intense sylvatic cycle in the region, which demands intensive surveillance to prevent human transmission. More... »

PAGES

154-154

Journal

TITLE

Parasites & Vectors

ISSUE

1

VOLUME

7

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/1756-3305-7-154

DOI

http://dx.doi.org/10.1186/1756-3305-7-154

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1052979186

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/24690302


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17 schema:description BACKGROUND: The rising number of acute cases of Chagas disease in the State of Pará, reported in the past two decades, has been associated, in part, with the ingestion of juice of local palm tree fruits, mainly açaí berry and bacaba. Near the study area, in Santarém, Pará State, an outbreak of Chagas disease has been notified and investigations suggest the consumption of bacaba juice as the main source of infection with T. cruzi. The purpose of this study is to assess the aspects associated to the ecology of Rhodnius robustus in palm trees of three communities of the Tapajós region, in the State of Pará, Brazil. METHODS: Palm trees were cut down and dissected to search for triatomines. DNA from triatomines was extracted to investigate natural infection by Trypanosoma cruzi and T. rangeli. For statistical analyzes, data from infestation of palm trees, as well as the rates of natural infection by T. cruzi and T. rangeli were compared by Chi-square test. Triatomine density values were analyzed by the nonparametric Kruskal Wallis test and then comparisons between each pair of variables were made by the Mann-Whitney test assuming a confidence interval of 95%. RESULTS: We dissected 136 palm trees, 60 at the end of the rainy period and 76 at the end of the dry period. Seventy-three of them (53.7%) were infested with triatomines and three species were found, namely: Rhodnius robustus, Rhodnius pictipes and Panstrongylus lignarius. We collected 743 triatomines, and R. robustus was predominant (n = 739). The identification of natural infection of the insects by trypanosomatids revealed that 125 triatomines were infected by T. cruzi, 69 by T. rangeli and 14 presented both parasites, indicating the presence of mixed infection in the same vector. CONCLUSION: The results suggest that São Tomé is the community with greater density of triatomines and infestation of palm trees; also, it demonstrates the existence of an intense sylvatic cycle in the region, which demands intensive surveillance to prevent human transmission.
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24 schema:keywords Attalea palm trees
25 Brazil
26 Chagas disease
27 DNA
28 Kruskal-Wallis test
29 Mann-Whitney test
30 Panstrongylus lignarius
31 Pará
32 Pará State
33 Rhodnius pictipes
34 Rhodnius robustus
35 River region
36 Santarém
37 São Tomé
38 Tapajós River region
39 Tapajós region
40 Tomé
41 Triatomine density values
42 Trypanosoma cruzi
43 Wallis test
44 acute cases
45 analyzes
46 area
47 aspects
48 açaí berry
49 bacaba
50 bacaba juice
51 berries
52 cases
53 chi-square test
54 community
55 comparison
56 confidence intervals
57 consumption
58 cruzi
59 cycle
60 data
61 decades
62 density
63 density values
64 disease
65 dry period
66 ecology
67 end
68 existence
69 fruit
70 greater density
71 human transmission
72 identification
73 infection
74 infestation
75 ingestion
76 ingestion of juice
77 insects
78 intense sylvatic cycle
79 intensive surveillance
80 intervals
81 investigation
82 juice
83 lignarius
84 local palm tree fruits
85 main source
86 mixed infections
87 natural infection
88 nonparametric Kruskal-Wallis test
89 number
90 outbreak
91 pairs
92 pairs of variables
93 palm tree fruits
94 palm trees
95 parasites
96 part
97 period
98 pictipes
99 presence
100 purpose
101 rainy period
102 rangeli
103 rate
104 region
105 results
106 robustus
107 same vector
108 source
109 species
110 state
111 state of Pará
112 statistical analyzes
113 study
114 study area
115 surveillance
116 sylvatic cycle
117 test
118 transmission
119 tree fruits
120 trees
121 triatomines
122 trypanosomatids
123 values
124 variables
125 vector
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