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Lainson R, Shaw JJ, Silveira FT, Braga RR. American visceral leishmaniasis: on the origin of Leishmania (Leishmania) chagasi. Trans R Soc Trop Med Hyg 1987; 81:517. [PMID: 3686647 DOI: 10.1016/0035-9203(87)90187-8] [Citation(s) in RCA: 69] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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127
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Shaw JJ, Lainson R, Ryan L, Braga RR, McMahon-Pratt D, David JR. Leishmaniasis in Brazil: XXIII. The identification of Leishmania braziliensis braziliensis in wild-caught neotropical sandflies using monoclonal antibodies. Trans R Soc Trop Med Hyg 1987; 81:69-72. [PMID: 3445325 DOI: 10.1016/0035-9203(87)90287-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Using the indirect immunofluorescence test natural flagellate infections of wild-caught sandflies, from the Serra dos Carajás region of Pará State, Brazil, were identified by sequentially staining smears made from the infected flies with monoclonal antibodies. With normal methods of isolation 30% of the infections were identifiable, but when monoclonal antibodies specific to Leishmania braziliensis braziliensis were used a further 26% were identified. The staining of organisms in smears of natural infections was different from that seen with culture forms and with forms from experimentally infected wild flies. A monoclonal antibody previously thought to be specific for Leishmania did not react with culture forms of Endotrypanum, but did react with those of monoxenous insect parasites.
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Ryan L, Lainson R, Shaw JJ. Leishmaniasis in Brazil. XXIV. Natural flagellate infections of sandflies (Diptera: Psychodidae) in Pará State, with particular reference to the rôle of Psychodopygus wellcomei as the vector of Leishmania braziliensis braziliensis in the Serra dos Carajás. Trans R Soc Trop Med Hyg 1987; 81:353-9. [PMID: 3686628 DOI: 10.1016/0035-9203(87)90133-7] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Between July 1983 and December 1984 natural flagellate infections were found in 114 (1%) of 11,586 female phlebotomine sandflies (Diptera: Psychodidae) of 21 species. A further 1084 females of 17 other species were not infected. Identification of the organisms on a number of occasions confirms the exclusive parasite/vector relationship of Leishmania mexicana amazonensis/Lutzomyia flaviscutellata and Le. braziliensis braziliensis/Psychodopygus "wellcomei". Undescribed or unidentified Leishmania spp. were isolated from Lu. shawi, Lu. ubiquitalis, Lu. whitmani, Ps. hirsutus, Ps. paraensis Ps. "wellcomei", and trypanosomes from Lu. nordestina and Lu. trinidadensis. Flagellate infections were recorded in 8 of 21 species examined for the first time, and some were isolated directly from insects into cultures. Le. b. braziliensis was transmitted to a hamster by the bite of a wild-caught, naturally infected Ps. "wellcomei". 7 of the 35 infected Ps. "wellcomei" were allowed to oviposit and the eggs were reared to adults. Four produced Ps. wellcomei males only, confirming the rôle of this species as the major vector of Le. b. braziliensis.
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Lainson R. Part I.II Current Methods in Studies on the Ecology and Epidemiology of the Leishmaniases with Particular Reference to the Americas. J ROY ARMY MED CORPS 1986. [DOI: 10.1136/jramc-132-03-06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Phillips A, Ward R, Ryan L, Molyneux DH, Lainson R, Shaw JJ. Chemical analysis of compounds extracted from the tergal "spots" of Lutzomyia longipalpis from Brazil. Acta Trop 1986; 43:271-6. [PMID: 2877553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The chemical composition of the compounds contained in the tergal spots of Lutzomyia longipalpis was investigated. Four populations of L. longipalpis were examined, originating from: Sobral, Ceará, Brazil (one spot and two spot populations), Santarém, Pará, Brazil (one spot) and Marajó Island, Pará, Brazil (one spot). The tergal spots were dissected out, extracted in hexane and analysed on a gas chromatograph/mass spectrometer. Two compounds were found, identical to compounds found in earlier studies, but there was no correlation between number of tergal spots and type of compound present. It was suggested that the number of tergal spots could not be used as a marker for reproductively isolated populations, and that analysis of the compound present within the spots might be necessary to characterize potentially good vector populations.
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Ryan L, Fraiha H, Lainson R, Shaw JJ. New Phlebotomine Sandflies of the walkeri group (Diptera: Psychodidae) from Pará State, Brazil, with a pictorial key 1. Mem Inst Oswaldo Cruz 1986. [DOI: 10.1590/s0074-02761986000300009] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The male and female of Lutzomyia carmelinoi n.sp., and the female only of L. baculus and L. williamsi, (Diptera:Psychodidae) are described and illustrated from specimens collected in Pará state, Brazil. A pictorial key is presented to these and the other members of the walkeri group.
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132
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Fraiha H, Ryan L, Ward RD, Lainson R, Shaw J. Psychodopygus Leonidasdeanei a new species of sand fly (Diptera: Psychodidae) from Pará State, Brazil. Mem Inst Oswaldo Cruz 1986. [DOI: 10.1590/s0074-02761986000300010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The male and female of Psychodopygus leonidasdeanei n.sp., (Diptera : Psychodidae) are described and illustrated from specimens collected in Shannon traps near Santarém, Pará State, Brazil. This species is a member of the squamiventris series and information is given on the distribution of the members of this series in Pará. A pictorial guide to separate the males and some females from others in the series is given.
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Ryan L, Phillips A, Milligan P, Lainson R, Molyneux DH, Shaw JJ. Separation of female Psychodopygus wellcomei and P. complexus (Diptera: Psychodidae) by cuticular hydrocarbon analysis. Acta Trop 1986; 43:85-9. [PMID: 2872790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Psychodopygus wellcomei (Diptera: Psychodidae), vector of Leishmania braziliensis braziliensis - causative agent of cutaneous leishmaniasis in Brazil, cannot be distinguished from sympatric P. complexus either by morphometrics or isoenzyme profiles. We report here the use of cuticular hydrocarbon analysis in the successful separation of individual female P. wellcomei and P. complexus. This technique involves the use of gas liquid chromatography and discriminant function analysis.
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Ryan L, Lainson R, Shaw JJ. The experimental transmission of Leishmania mexicana amazonensis Lainson & Shaw, between hamsters by the bite of Lutzomyia furcata (Mangabeira). Trans R Soc Trop Med Hyg 1986; 80:164-5. [PMID: 3726982 DOI: 10.1016/0035-9203(86)90226-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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135
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Braga RR, Lainson R, Shaw JJ, Ryan L, Silveira FT. Leishmaniasis in Brazil. XXII: Characterization of Leishmania from man, dogs and the sandfly Lutzomyia longipalpis (Lutz & Neiva, 1912) isolated during an outbreak of visceral leishmaniasis in Santarém, Pará State. Trans R Soc Trop Med Hyg 1986; 80:143-5. [PMID: 3726975 DOI: 10.1016/0035-9203(86)90214-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
During epidemiological studies on an outbreak of visceral leishmaniasis in Santarém, Pará State, north Brazil, isolates of Leishmania from two children, three dogs and six naturally infected specimens of the sandfly Lutzomyia longipalpis were compared, biochemically, by starch-gel enzyme electrophoresis. They have proved to be indistinguishable from each other, and from a reference strain of Leishmania chagasi Cunha & Chagas, 1937 from a case of human visceral leishmaniasis from Bahia State, north-east Brazil, on their enzyme profiles for ASAT, ALAT, PGM, GPI, MDH and MPI. Lu. longipalpis is the principal, and possibly the only vector to man in the Amazon Region of Brazil.
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Rangel EF, Ryan L, Lainson R, Shaw JJ. Observations on the sandfly (Diptera: Psychodidae) fauna of Além Paraíba, State of Minas Gerais, Brazil, and the isolation of a parasite of the Leishmania braziliensis complex from Psychodopygus hirsuta hirsuta. Mem Inst Oswaldo Cruz 1985; 80:373-4. [PMID: 3837173 DOI: 10.1590/s0074-02761985000300017] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Dissection of 765 sandflies captured in Além Paraíba (the type locality of Leishmania braziliensis) resulted in the isolation, from Psychodopygus hirsuta hirsuta, of a parasite of the Le. braziliensis complex.
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Gonçalves MD, Ryan L, Lainson R, Shaw JJ. The retained capacity of Lutzomyia longipalpis (Lutz & Neiva) to transmit Leishmania chagasi (Cunha & Chagas) after eight years (64 generations) in a closed laboratory colony. Mem Inst Oswaldo Cruz 1985; 80:337-8. [PMID: 3837170 DOI: 10.1590/s0074-02761985000300010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
A closed Lutzomyia longipalpis colony, from Ceará has been used to transmit Leishmania chagasi isolated from a fox in Pará state. The last time this colony was successfully used in similar transmission experiments was eight years (64 generations) ago indicating that this colony of Lu. longipalpis has fully maintained its vectorial capacity in spite of such a long period of maintainance in the laboratory.
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138
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Lainson R. Ourpresent knowledge of the ecology and controlof leishmaniasis in the Amazon region of Brazil. Rev Soc Bras Med Trop 1985. [DOI: 10.1590/s0037-86821985000100011] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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139
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Lainson R, Shaw JJ, Ryan L, Ribeiro RS, Silveira FT. Leishmaniasis in Brazil. XXI. Visceral leishmaniasis in the Amazon Region and further observations on the role of Lutzomyia longipalpis (Lutz & Neiva, 1912) as the vector. Trans R Soc Trop Med Hyg 1985; 79:223-6. [PMID: 4002291 DOI: 10.1016/0035-9203(85)90340-2] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Further evidence is presented incriminating the sandfly Lutzomyia longipalpis as the vector of Leishmania chagasi, the causative agent of American visceral leishmaniasis, in the Amazon Region of Brazil. During an outbreak of the disease in Santarém, Pará State, this insect was shown to be the only species of sandfly consistently present in and around the patient's homes, where it often occurred in very large numbers. Of 491 specimens dissected, 35 (7.14%) proved to be infected, and isolates of L. chagasi were made from 16 of 27 of these sandflies following the inoculation of the promastigotes into hamsters. Finally, the parasite was transmitted to four other hamsters which had been subjected to the bites of large numbers of wild-caught Lu. longipalpis. Isolates of Leishmania from Lu. longipalpis captures in Santarém, and in another focus of visceral leishmaniasis on the Island of Marajó, Pará, have been shown to be biologically and biochemically indistinguishable from the parasite infecting man, dogs and foxes in Pará, and from stocks obtained from man elsewhere in Brazil (Bahia and Ceará States).
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Silveira FT, Lainson R, Shaw JJ, Ribeiro RDS. [Cutaneous leishmaniasis in Amazonia. Report of the 1st human case of mixed infection, determined by 2 different Leishmania species: Leishmania brasiliensis and Leishmania mexicana amazonensis]. Rev Inst Med Trop Sao Paulo 1984; 26:272-5. [PMID: 6533750 DOI: 10.1590/s0036-46651984000500008] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Fez-se o registro, na Amazônia, do primeiro caso humano de infecção cutânea mista determinada por duas espécies distintas de Leishmania: a Leishmania braziliensis braziliensis e a Leishmania mexicana amazonensis. As duas amostras, em questão, foram isoladas de lesões distintas de um mesmo paciente, e a caracterização das espécies foi feita com base em observações de infecção experimental em hamsters, comportamento em meios artificiais de cultura, desenvolvimento de infecção experimental em Lutzomyia longipalpis, e eletroforese de isoenzimas em gel de amido. Conclui-se ser de interesse o achado que, combinado com o fato já conhecido de ausência de imunidade cruzada entre a maioria das leishmânias, sugere a necessidade do emprego de uma vacina polivalente para a região.
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141
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Ryan L, Silveira FT, Lainson R, Shaw JJ. Leishmanial infections in Lutzomyia longipalpis and Lu. antunesi (Diptera: Psychodidae) on the island of Marajó, Pará State, Brazil. Trans R Soc Trop Med Hyg 1984; 78:547-8. [PMID: 6485061 DOI: 10.1016/0035-9203(84)90081-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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142
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Ready PD, Lainson R, Shaw JJ. Habitat and seasonality of Psychodopygus wellcomei help incriminate it as a vector of Leishmania braziliensis in Amazônia and northeast Brazil. Trans R Soc Trop Med Hyg 1984; 78:543-4. [PMID: 6485059 DOI: 10.1016/0035-9203(84)90079-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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143
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Wilkes TJ, Ready PD, Lainson R, Killick-Kendrick R. Biting periodicities of nulliparous and parous females of Psychodopygus wellcomei. Trans R Soc Trop Med Hyg 1984; 78:846-7. [PMID: 6533861 DOI: 10.1016/0035-9203(84)90044-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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144
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Lainson R. Cutaneous leishmaniasis in Belize, Central America, and identity of the causative parasite. Trans R Soc Trop Med Hyg 1984; 78:851-2. [PMID: 6533866 DOI: 10.1016/0035-9203(84)90050-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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145
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Lainson R, Naiff RD, Best RC, Shaw JJ. Eimeria trichechi n.sp. from the Amazonian manatee, Trichechus inunguis (Mammalia: Sirenia). Syst Parasitol 1983. [DOI: 10.1007/bf00009162] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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146
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Ready PD, Ribeiro AL, Lainson R, de Alencar JE, Shaw JJ. Presence of Psychodopygus wellcomei (Diptera: Psychodidae), a proven vector of Leishmania braziliensis braziliensis, in Ceará State. Mem Inst Oswaldo Cruz 1983; 78:235-6. [PMID: 6645954 DOI: 10.1590/s0074-02761983000200013] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Psychodopygus wellcomei, a proven vector of (muco-)cutaneous leishmaniasis, has been found for the first time outside of the Amazon Basin, in Ceará State. Parasitological and entomological evidence suggests that the Leishmania braziliensis braziliensis/Ps. wellcomei zoonosis is widespread on the Brazilian Shield.
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Lainson R, Shaw JJ, Silveira FT, Fraiha H. Leishmaniasis in Brazil. XIX: visceral leishmaniasis in the Amazon Region, and the presence of Lutzomyia longipalpis on the Island of Marajó, Pará State. Trans R Soc Trop Med Hyg 1983; 77:323-30. [PMID: 6623589 DOI: 10.1016/0035-9203(83)90154-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Sporadic cases of visceral leishmaniasis in Amazonian Brazil appear limited to Pará State, in the lower Amazon valley and principally near the Atlantic coast. The fox Cerdocyon thous (L.) has been incriminated as a natural host of the causative parasite, Leishmania donovani chagasi, but past doubts have existed over the identification of the most likely vector as Lutzomyia (Lutzomyia) longipalpis (Lutz & Neiva, 1912). Investigations on two of five recent cases of visceral leishmaniasis of man in the Districts of Cachoeira do Arari and Salvaterra, on the eastern part of the Island of Marajó, Pará showed undoubted Lu. longipalpis to be abundant in one house and in numerous chicken-houses. This is the first record of Lu. longipalpis on Marajó Island, and the finding supports previous implication of this sandfly in the epidemiology of visceral leishmaniasis in other parts of Pará. Morphological differences have been noted between this insect from Marajó and other specimens from more highly endemic regions in the States of Ceará and Minas Gerais, Brazil.
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148
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Lainson R. The American leishmaniases: some observations on their ecology and epidemiology. Trans R Soc Trop Med Hyg 1983; 77:569-96. [PMID: 6197791 DOI: 10.1016/0035-9203(83)90185-2] [Citation(s) in RCA: 176] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
As the first species of Leishmania encountered were the agents of human visceral and cutaneous leishmaniasis, it is understandable that studies on these parasites for a long time concentrated on those organisms commonly causing disease in man. Epidemiological studies over the past 20 years or so, however, have led to the inescapable conclusion that the genus Leishmania is comprised of numerous species of well adapted parasites, in a wide range of mammals, throughout most of those tropical and subtropical regions of the world where phlebotomine sandflies exist (Diptera: Psychodidae). Many of the leishmanias probably never gain entrance into man: due either to an incapacity to survive in his tissues, or (more likely) because the natural sandfly vectors do not feed on him. The leishmanias that do infect man are, nevertheless, among the greatest protozoological scourges of mankind, and a better understanding of their life-cycles may well help in future prevention or control of the diseases they cause. With few exceptions the leishmaniases are zoonoses, with a major source of infection in wild or domestic animals. In the Americas, the disease is essentially a rural one, and most commonly acquired by those penetrating forested or wooded regions. The following paper deals with the better known human leishmaniases of the New World, and some new ones, and discusses the major historical events in the laborious task of elucidating their ecology and epidemiology.
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149
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Ready PD, Lainson R, Shaw JJ. Leishmaniasis in Brazil: XX. Prevalence of "enzootic rodent leishmaniasis" (Leishmania mexicana amazonensis), and apparent absence of "pian bois" (Le. braziliensis guyanensis), in plantations of introduced tree species and in other non-climax forests in eastern Amazônia. Trans R Soc Trop Med Hyg 1983; 77:775-85. [PMID: 6665830 DOI: 10.1016/0035-9203(83)90288-2] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
In Amazonian Brazil most human leishmaniasis is due to Leishmania braziliensis s.l. and is acquired during the clearing of primary climax forest. One of the largest deforestation projects has taken place on the JARI property where plantations of exotic tree species are grown for paper pulp. The ability of the regional leishmaniasis enzootics to invade plantations was investigated. CDC light-trap catches indicated the phletobomine vectors of Le. b. guyanensis (causing "pian bois" in man) to be very scarce in JARI plantations compared to native-forest controls. It is concluded (drawing on other observations) that the vectors of "pian bois" are unlikely to thrive in any secondary forest. In contrast, catches from mammal traps and rodent-baited (Disney) traps demonstrated the presence in JARI plantations of infected Proechimys guyannensis and large populations of Lutzomyia flaviscutellata, respectively the major rodent reservoir and sandfly vector of Le. mexicana amazonensis. Alone amongst the local vectors of human cutaneous leishmaniasis, Lu. flaviscutellata is adapted to non-climax forests (primary or secondary, natural or man-made; synopsis given). It is predicted that the public health importance of Le. m. amazonensis is unlikely to diminish following the development of Amazônia. This is worrying because ca. 30% of Le. m. amazonensis infections in man cause highly-disfiguring, incurable "diffuse cutaneous leishmaniasis".
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Lainson R, Shaw JJ. Coccidia of Brazilian edentates: Eimeria cyclopei n.sp. from the silky anteater, Cyclopes didactylus (Linn.) and Eimeria choloepi n.sp. from the two-toed sloth, Choloepus didactylus (Linn.). Syst Parasitol 1982. [DOI: 10.1007/bf00009629] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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