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  1. Article ; Online: Trypanosoma cruzi parasitemia in chronic Chagas disease: Insights from hierarchical modeling.

    Abad-Franch, Fernando

    PLoS neglected tropical diseases

    2022  Volume 16, Issue 8, Page(s) e0010612

    MeSH term(s) Chagas Disease ; Chronic Disease ; Humans ; Parasitemia ; Trypanosoma cruzi
    Language English
    Publishing date 2022-08-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2429704-5
    ISSN 1935-2735 ; 1935-2735
    ISSN (online) 1935-2735
    ISSN 1935-2735
    DOI 10.1371/journal.pntd.0010612
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Trypanosoma cruzi parasitemia in chronic Chagas disease

    Fernando Abad-Franch

    PLoS Neglected Tropical Diseases, Vol 16, Iss 8, p e

    Insights from hierarchical modeling.

    2022  Volume 0010612

    Keywords Arctic medicine. Tropical medicine ; RC955-962 ; Public aspects of medicine ; RA1-1270
    Language English
    Publishing date 2022-08-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Trypanosoma cruzi parasitemia in chronic Chagas disease

    Fernando Abad-Franch

    PLoS Neglected Tropical Diseases, Vol 16, Iss

    Insights from hierarchical modeling

    2022  Volume 8

    Keywords Arctic medicine. Tropical medicine ; RC955-962 ; Public aspects of medicine ; RA1-1270
    Language English
    Publishing date 2022-08-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Chagas disease diagnosis and cure assessment: Getting formally hierarchical about a naturally hierarchical problem.

    Abad-Franch, Fernando

    PLoS neglected tropical diseases

    2020  Volume 14, Issue 10, Page(s) e0008751

    MeSH term(s) Chagas Disease/diagnosis ; Chagas Disease/drug therapy ; Humans ; Practice Patterns, Physicians' ; Trypanosoma cruzi/isolation & purification
    Language English
    Publishing date 2020-10-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2429704-5
    ISSN 1935-2735 ; 1935-2727
    ISSN (online) 1935-2735
    ISSN 1935-2727
    DOI 10.1371/journal.pntd.0008751
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Chagas disease diagnosis and cure assessment

    Fernando Abad-Franch

    PLoS Neglected Tropical Diseases, Vol 14, Iss 10, p e

    Getting formally hierarchical about a naturally hierarchical problem.

    2020  Volume 0008751

    Keywords Arctic medicine. Tropical medicine ; RC955-962 ; Public aspects of medicine ; RA1-1270
    Language English
    Publishing date 2020-10-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  6. Article ; Online: A simple, biologically sound, and potentially useful working classification of Chagas disease vectors.

    Abad-Franch, Fernando

    Memorias do Instituto Oswaldo Cruz

    2016  Volume 111, Issue 10, Page(s) 649–651

    Abstract: Current working classifications of Chagas disease vectors rely on a loose mix-up of biological and operational matters. They are therefore confusing and ineffective. I propose a very simple classification that makes biological sense and can be ... ...

    Abstract Current working classifications of Chagas disease vectors rely on a loose mix-up of biological and operational matters. They are therefore confusing and ineffective. I propose a very simple classification that makes biological sense and can be operationally useful. It considers a four-level hierarchy of species (which can be native or non-native); populations (either wild or non-wild); infestation foci (natural, domestic or peridomestic); and individual bugs (which can be solitary house-invaders or part of a hidden infestation focus). This classification translates into a clear, algorithmic scheme for triatomine control-surveillance that may be useful at every operationally relevant scale, from multi-country initiatives to on-site control-surveillance action.
    MeSH term(s) Algorithms ; Animals ; Chagas Disease/transmission ; Insect Vectors/classification ; Triatominae/classification
    Language English
    Publishing date 2016-10
    Publishing country Brazil
    Document type Journal Article
    ZDB-ID 953293-6
    ISSN 1678-8060 ; 0074-0276
    ISSN (online) 1678-8060
    ISSN 0074-0276
    DOI 10.1590/0074-02760160203
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Triatoma costalimai

    Lima de Miranda, Vinícius / Gurgel-Gonçalves, Rodrigo / Moreira de Souza, Rita de Cássia / Abad-Franch, Fernando

    Current research in parasitology & vector-borne diseases

    2022  Volume 2, Page(s) 100102

    Abstract: ... Triatoma ... ...

    Abstract Triatoma costalimai
    Language English
    Publishing date 2022-11-11
    Publishing country Netherlands
    Document type Journal Article ; Review
    ISSN 2667-114X
    ISSN (online) 2667-114X
    DOI 10.1016/j.crpvbd.2022.100102
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Deforestation effects on Attalea palms and their resident Rhodnius, vectors of Chagas disease, in eastern Amazonia.

    Santos, Walter Souza / Gurgel-Gonçalves, Rodrigo / Garcez, Lourdes Maria / Abad-Franch, Fernando

    PloS one

    2021  Volume 16, Issue 5, Page(s) e0252071

    Abstract: Attalea palms provide primary habitat to Rhodnius spp., vectors of Trypanosoma cruzi. Flying from palms, these blood-sucking bugs often invade houses and can infect people directly or via food contamination. Chagas disease (CD) risk may therefore ... ...

    Abstract Attalea palms provide primary habitat to Rhodnius spp., vectors of Trypanosoma cruzi. Flying from palms, these blood-sucking bugs often invade houses and can infect people directly or via food contamination. Chagas disease (CD) risk may therefore increase when Attalea palms thrive near houses. For example, Attalea dominate many deforested landscapes of eastern Amazonia, where acute-CD outbreaks are disturbingly frequent. Despite this possible link between deforestation and CD risk, the population-level responses of Amazonian Attalea and their resident Rhodnius to anthropogenic landscape disturbance remain largely uncharted. We studied adult Attalea palms in old-growth forest (OGF), young secondary forest (YSF), and cattle pasture (CP) in two localities of eastern Amazonia. We recorded 1856 Attalea along 10 transects (153.6 ha), and detected infestation by Rhodnius spp. in 18 of 280 systematically-sampled palms (33 bugs caught). Distance-sampling models suggest that, relative to OGF, adult Attalea density declined by 70-80% in CP and then recovered in YSF. Site-occupancy models estimate a strong positive effect of deforestation on palm-infestation odds (βCP-infestation = 4.82±1.14 SE), with a moderate decline in recovering YSF (βYSF-infestation = 2.66±1.10 SE). Similarly, N-mixture models suggest that, relative to OGF, mean vector density sharply increased in CP palms (βCP-density = 3.20±0.62 SE) and then tapered in YSF (βYSF-density = 1.61±0.76 SE). Together, these results indicate that disturbed landscapes may support between ~2.5 (YSF) and ~5.1 (CP) times more Attalea-dwelling Rhodnius spp. per unit area than OGF. We provide evidence that deforestation may favor palm-dwelling CD vectors in eastern Amazonia. Importantly, our landscape-disturbance effect estimates explicitly take account of (i) imperfect palm and bug detection and (ii) the uncertainties about infestation and vector density arising from sparse bug data. These results suggest that incorporating landscape-disturbance metrics into the spatial stratification of transmission risk could help enhance CD surveillance and prevention in Amazonia.
    MeSH term(s) Animals ; Chagas Disease/parasitology ; Ecosystem ; Insect Vectors/parasitology ; Rhodnius/pathogenicity ; Trypanosoma cruzi/pathogenicity
    Language English
    Publishing date 2021-05-20
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0252071
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Chagas disease control-surveillance in the Americas: the multinational initiatives and the practical impossibility of interrupting vector-borne Trypanosoma cruzi transmission.

    de Arias, Antonieta Rojas / Monroy, Carlota / Guhl, Felipe / Sosa-Estani, Sergio / Santos, Walter Souza / Abad-Franch, Fernando

    Memorias do Instituto Oswaldo Cruz

    2022  Volume 117, Page(s) e210130

    Abstract: Chagas disease (CD) still imposes a heavy burden on most Latin American countries. Vector-borne and mother-to-child transmission cause several thousand new infections per year, and at least 5 million people carry Trypanosoma cruzi. Access to diagnosis ... ...

    Abstract Chagas disease (CD) still imposes a heavy burden on most Latin American countries. Vector-borne and mother-to-child transmission cause several thousand new infections per year, and at least 5 million people carry Trypanosoma cruzi. Access to diagnosis and medical care, however, is far from universal. Starting in the 1990s, CD-endemic countries and the Pan American Health Organization-World Health Organization (PAHO-WHO) launched a series of multinational initiatives for CD control-surveillance. An overview of the initiatives' aims, achievements, and challenges reveals some key common themes that we discuss here in the context of the WHO 2030 goals for CD. Transmission of T. cruzi via blood transfusion and organ transplantation is effectively under control. T. cruzi, however, is a zoonotic pathogen with 100+ vector species widely spread across the Americas; interrupting vector-borne transmission seems therefore unfeasible. Stronger surveillance systems are, and will continue to be, needed to monitor and control CD. Prevention of vertical transmission demands boosting current efforts to screen pregnant and childbearing-aged women. Finally, integral patient care is a critical unmet need in most countries. The decades-long experience of the initiatives, in sum, hints at the practical impossibility of interrupting vector-borne T. cruzi transmission in the Americas. The concept of disease control seems to provide a more realistic description of what can in effect be achieved by 2030.
    MeSH term(s) Aged ; Americas/epidemiology ; Animals ; Chagas Disease/epidemiology ; Chagas Disease/prevention & control ; Disease Vectors ; Female ; Humans ; Infectious Disease Transmission, Vertical/prevention & control ; Pregnancy ; Trypanosoma cruzi
    Language English
    Publishing date 2022-07-06
    Publishing country Brazil
    Document type Journal Article
    ZDB-ID 953293-6
    ISSN 1678-8060 ; 0074-0276
    ISSN (online) 1678-8060
    ISSN 0074-0276
    DOI 10.1590/0074-02760210130
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Ud II Zs.33: Show issues Location:
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  10. Article ; Online: Dehydration-Stress Resistance in Two Sister, Cryptic Rhodnius Species-Rhodnius prolixus and Rhodnius robustus Genotype I (Hemiptera: Reduviidae).

    Brito, Raíssa N / Souza, Rita C M / Abad-Franch, Fernando

    Journal of medical entomology

    2019  Volume 56, Issue 4, Page(s) 1019–1026

    Abstract: Rhodnius prolixus Stål, a major Chagas disease vector, often colonizes in houses, whereas its sister species, Rhodnius robustus Larrousse genotype I, does not colonize in houses and has little medical relevance. Factors potentially underlying this ... ...

    Abstract Rhodnius prolixus Stål, a major Chagas disease vector, often colonizes in houses, whereas its sister species, Rhodnius robustus Larrousse genotype I, does not colonize in houses and has little medical relevance. Factors potentially underlying this crucial difference remain largely uncharted. The 'microclimate-adaptation hypothesis' notes that R. prolixus is adapted to the dry microclimate of small-crowned Copernicia palms, whereas R. robustus I exploits the high-moisture microclimate of large-crowned Attalea and Acrocomia. Hence, R. prolixus, but not R. robustus I, would be (pre)adapted to the relatively dry microclimate typical of man-made habitats. This hypothesis predicts that, while severe dehydration should harm both species similarly, R. prolixus should withstand moderate-to-mild dehydration stress better than R. robustus I. To test this prediction, we compared fitness metrics of genotyped R. prolixus and R. robustus I kept at 28°C and under severe (20% relative humidity, RH), moderate (40% RH), or mild dehydration stress (75% RH). Egg-hatching success increased with decreasing dehydration stress in R. robustus I (0% → 19% → 100%), but was high across treatments in R. prolixus (78% → 100% → 100%). Both species underwent high, early mortality under severe dehydration; under moderate and mild stress, R. prolixus experienced less mortality and survived longer than R. robustus I. Our results suggest that adaptation to distinct palm-crown microclimates may partly underlie the so far unexplained differences in house-colonization ability among Rhodnius Stål species. Experimental replication across additional species/populations will be required to further probe this adaptive hypothesis-which, if supported, may also provide insight into the likely responses of Chagas disease vectors to climate change.
    MeSH term(s) Animals ; Dehydration ; Rhodnius/physiology ; Species Specificity ; Stress, Physiological
    Language English
    Publishing date 2019-06-20
    Publishing country England
    Document type Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 410635-0
    ISSN 1938-2928 ; 0022-2585
    ISSN (online) 1938-2928
    ISSN 0022-2585
    DOI 10.1093/jme/tjz041
    Database MEDical Literature Analysis and Retrieval System OnLINE

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