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  1. Article ; Online: An Updated Review of the Invasive Aedes albopictus in the Americas; Geographical Distribution, Host Feeding Patterns, Arbovirus Infection, and the Potential for Vertical Transmission of Dengue Virus

    Julian E. Garcia-Rejon / Juan-Carlos Navarro / Nohemi Cigarroa-Toledo / Carlos M. Baak-Baak

    Insects, Vol 12, Iss 967, p

    2021  Volume 967

    Abstract: Aedes ( Stegomyia ) albopictus is a mosquito native to Southeast Asia. Currently, it has a wide distribution in America, where natural infection with arboviruses of medical and veterinary importance has been reported. In spite of their importance in the ... ...

    Abstract Aedes ( Stegomyia ) albopictus is a mosquito native to Southeast Asia. Currently, it has a wide distribution in America, where natural infection with arboviruses of medical and veterinary importance has been reported. In spite of their importance in the transmission of endemic arbovirus, the basic information of parameters affecting their vectorial capacity is poorly investigated. The aim of the work was to update the distribution range of Ae. albopictus in the Americas, review the blood-feeding patterns, and compare the minimum infection rate (MIR) of the Dengue virus (DENV) between studies of vertical and horizontal transmission. The current distribution of Ae. albopictus encompasses 21 countries in the Americas. An extensive review has been conducted for the blood-feeding patterns of Ae. albopictus . The results suggest that the mosquito is capable of feeding on 16 species of mammals and five species of avian. Humans, dogs, and rats are the most common hosts. Eight arboviruses with the potential to infect humans and animals have been isolated in Ae. albopictus . In the United States of America (USA), Eastern equine encephalitis virus, Keystone virus, La Crosse Virus, West Nile virus, and Cache Valley virus were isolated in the Asian mosquito. In Brazil, Mexico, Colombia, and Costa Rica, DENV (all serotypes) has been frequently identified in field-caught Ae. albopictus . Overall, the estimated MIR in Ae. albopictus infected with DENV is similar between horizontal (10.95) and vertical transmission (8.28). However, in vertical transmission, there is a difference in the MIR values if the DENV is identified from larvae or adults (males and females emerged from a collection of eggs or larvae). MIR estimated from larvae is 14.04 and MIR estimated in adults is 4.04. In conclusion, it has to be highlighted that Ae. albopictus is an invasive mosquito with wide phenotypic plasticity to adapt to broad and new areas, it is highly efficient to transmit the DENV horizontally and vertically, it can participate in the ...
    Keywords Asian tiger mosquito ; feeding pattern ; minimum infection rate ; emerging arboviruses ; Dengue virus ; Science ; Q
    Subject code 590
    Language English
    Publishing date 2021-10-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Mites associated with budgerigars Melopsittacus undulatus (Psittaciformes

    Julian E. Garcia-Rejon / Ingrid Y. Cab-Cauich / Julio C. Tzuc-Dzul / Nohemi Cigarroa-Toledo / Wilbert A. Chi-Chim / Jose I. Chan-Perez / Karla Y. Acosta-Viana / Carlos M. Baak-Baak

    Open Veterinary Journal, Vol 13, Iss 1, Pp 20-

    Psittacidae) and the first report of Ornithonyssus bursa (Mesostigmata: Macronyssidae) in Mexico

    2023  Volume 25

    Abstract: Background: Hematophagous mites affect numerous bird species, causing severe injuries to the budgerigars. Some species can cause dermatitis in humans. Aims: The purpose was to morphologically identify the mites related to budgerigars (Melopsittacus ... ...

    Abstract Background: Hematophagous mites affect numerous bird species, causing severe injuries to the budgerigars. Some species can cause dermatitis in humans. Aims: The purpose was to morphologically identify the mites related to budgerigars (Melopsittacus undulatus) and their nests in Yucatan, Mexico. Methods: In May 2022, a private budgerigar hatchery was visited and mites were collected from the bodies of the birds and their nests. The morphological traits of the mites were confirmed by scanning electron microscopy. Results: Four of 30 birds showed severe clinical signs of mite infestation. The Budgerigars revealed lesions in the cere, nostrils, eyelids, beak, and paws. The bird's skin showed signs of dryness and beige colouring. The birds with severe damage also presented anorexia and had deformed paws and beaks. The parasitosis was caused by the "burrowing mites", Knemidocoptes pilae (Lavoipierre and Griffiths, 1951). The burrowing mites and the Grallacheles bakeri (De Leon 1962) were recovered and identified from paw scabs. To eliminate mites, a topical application of Ivermectin was administered to the necks of the birds. The dose was a single, which has a residuality of 21 days. Two drops (0.115mg/ml) of ivermectin were applied to each bird. A gradual reduction in crusted lesions due to mite mortality was noted. The "tropical fowl mite" Ornithonyssus bursa (Berlese, 1888) was identified in the nests, which represent the first record in Mexico. Conclusions: Three species of mites were discovered in a single budgerigar hatchery. This emphasizes the importance of deworming birds and keeping a clean environment in their cages to reduce the potential for parasitic mite infestation. [Open Vet J 2023; 13(1.000): 20-25]
    Keywords ornamental birds ; knemidocoptes pilae ; grallacheles bakeri ; tropical fowl mite ; predatory mites ; Zoology ; QL1-991
    Subject code 590
    Language English
    Publishing date 2023-02-01T00:00:00Z
    Publisher Tripoli University
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Evidence of Zika Virus Infection in Pigs and Mosquitoes, Mexico

    Daniel Nunez-Avellaneda / Rosa Carmina Cetina-Trejo / Emily Zamudio-Moreno / Carlos Baak-Baak / Nohemi Cigarroa-Toledo / Guadalupe Reyes-Solis / Antonio Ortega-Pacheco / Gerardo Suzán / Chandra Tandugu / Julián E. García-Rejón / Bradley J. Blitvich / Carlos Machain-Williams

    Emerging Infectious Diseases, Vol 27, Iss 2, Pp 574-

    2021  Volume 577

    Abstract: Evidence suggests that pigs seroconvert after experimental exposure to Zika virus and are potential sentinels. We demonstrate that pigs are also susceptible to natural Zika virus infection, shown by the presence of antibodies in domestic pigs in Yucatan, ...

    Abstract Evidence suggests that pigs seroconvert after experimental exposure to Zika virus and are potential sentinels. We demonstrate that pigs are also susceptible to natural Zika virus infection, shown by the presence of antibodies in domestic pigs in Yucatan, Mexico. Zika virus RNA was detected in 5 species of mosquitoes collected inside pigpens.
    Keywords flavivirus ; Zika virus ; Mexico ; pigs ; mosquitos ; Culex ; Medicine ; R ; Infectious and parasitic diseases ; RC109-216
    Language English
    Publishing date 2021-02-01T00:00:00Z
    Publisher Centers for Disease Control and Prevention
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Application of Artificial Neural Networks for Dengue Fever Outbreak Predictions in the Northwest Coast of Yucatan, Mexico and San Juan, Puerto Rico

    Abdiel E. Laureano-Rosario / Andrew P. Duncan / Pablo A. Mendez-Lazaro / Julian E. Garcia-Rejon / Salvador Gomez-Carro / Jose Farfan-Ale / Dragan A. Savic / Frank E. Muller-Karger

    Tropical Medicine and Infectious Disease, Vol 3, Iss 1, p

    2018  Volume 5

    Abstract: Modelling dengue fever in endemic areas is important to mitigate and improve vector-borne disease control to reduce outbreaks. This study applied artificial neural networks (ANNs) to predict dengue fever outbreak occurrences in San Juan, Puerto Rico (USA) ...

    Abstract Modelling dengue fever in endemic areas is important to mitigate and improve vector-borne disease control to reduce outbreaks. This study applied artificial neural networks (ANNs) to predict dengue fever outbreak occurrences in San Juan, Puerto Rico (USA), and in several coastal municipalities of the state of Yucatan, Mexico, based on specific thresholds. The models were trained with 19 years of dengue fever data for Puerto Rico and six years for Mexico. Environmental and demographic data included in the predictive models were sea surface temperature (SST), precipitation, air temperature (i.e., minimum, maximum, and average), humidity, previous dengue cases, and population size. Two models were applied for each study area. One predicted dengue incidence rates based on population at risk (i.e., numbers of people younger than 24 years), and the other on the size of the vulnerable population (i.e., number of people younger than five years and older than 65 years). The predictive power was above 70% for all four model runs. The ANNs were able to successfully model dengue fever outbreak occurrences in both study areas. The variables with the most influence on predicting dengue fever outbreak occurrences for San Juan, Puerto Rico, included population size, previous dengue cases, maximum air temperature, and date. In Yucatan, Mexico, the most important variables were population size, previous dengue cases, minimum air temperature, and date. These models have predictive skills and should help dengue fever mitigation and management to aid specific population segments in the Caribbean region and around the Gulf of Mexico.
    Keywords nonlinear models ; Aedes aegypti ; Aedes albopictus ; remote sensing ; early warning systems ; Medicine ; R
    Subject code 910
    Language English
    Publishing date 2018-01-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article: Complete genome sequence of T’Ho virus, a novel putative flavivirus from the Yucatan Peninsula of Mexico

    Briese, Thomas / Maria A. Loroño-Pino / Julian E. Garcia-Rejon / Jose A. Farfan-Ale / Carlos Machain-Williams / Karin S. Dorman / W. Ian Lipkin / Bradley J. Blitvich

    Virology journal. 2017 Dec., v. 14, no. 1

    2017  

    Abstract: BACKGROUND: We previously reported the discovery of a novel, putative flavivirus designated T’Ho virus in Culex quinquefasciatus mosquitoes in the Yucatan Peninsula of Mexico. A 1358-nt region of the NS5 gene was amplified and sequenced but an isolate ... ...

    Abstract BACKGROUND: We previously reported the discovery of a novel, putative flavivirus designated T’Ho virus in Culex quinquefasciatus mosquitoes in the Yucatan Peninsula of Mexico. A 1358-nt region of the NS5 gene was amplified and sequenced but an isolate was not recovered. RESULTS: The complete genome of T’Ho virus was sequenced using a combination of unbiased high-throughput sequencing, 5′ and 3′ rapid amplification of cDNA ends, reverse transcription-polymerase chain reaction and Sanger sequencing. The genome contains a single open reading frame of 10,284 nt which is flanked by 5′ and 3′ untranslated regions of 97 and 556-nt, respectively. Genome sequence alignments revealed that T’Ho virus is most closely related to Rocio virus (67.4% nucleotide identity) and Ilheus virus (65.9%), both of which belong to the Ntaya group, followed by other Ntaya group viruses (58.8–63.3%) and Japanese encephalitis group viruses (62.0–63.7%). Phylogenetic inference is in agreement with these findings. CONCLUSIONS: This study furthers our understanding of flavivirus genetics, phylogeny and diagnostics. Because the two closest known relatives of T’Ho virus are human pathogens, T’Ho virus could be an unrecognized cause of human disease. It is therefore important that future studies investigate the public health significance of this virus.
    Keywords Ilheus virus ; complementary DNA ; diagnostic techniques ; encephalitis ; genes ; high-throughput nucleotide sequencing ; human diseases ; open reading frames ; phylogeny ; rapid amplification of cDNA ends ; reverse transcriptase polymerase chain reaction ; sequence alignment ; transcription (genetics) ; viruses ; Mexico
    Language English
    Dates of publication 2017-12
    Size p. 110.
    Publishing place BioMed Central
    Document type Article
    ISSN 1743-422X
    DOI 10.1186/s12985-017-0777-6
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Modelling dengue fever risk in the State of Yucatan, Mexico using regional-scale satellite-derived sea surface temperature

    Laureano-Rosario, Abdiel E / Frank E. Muller-Karger / Jose A. Farfan-Ale / Julian E. Garcia-Rejon / Salvador Gomez-Carro

    Acta tropica. 2017 Aug., v. 172

    2017  

    Abstract: Accurately predicting vector-borne diseases, such as dengue fever, is essential for communities worldwide. Changes in environmental parameters such as precipitation, air temperature, and humidity are known to influence dengue fever dynamics. Furthermore, ...

    Abstract Accurately predicting vector-borne diseases, such as dengue fever, is essential for communities worldwide. Changes in environmental parameters such as precipitation, air temperature, and humidity are known to influence dengue fever dynamics. Furthermore, previous studies have shown how oceanographic variables, such as El Niño Southern Oscillation (ENSO)-related sea surface temperature from the Pacific Ocean, influences dengue fever in the Americas. However, literature is lacking on the use of regional-scale satellite-derived sea surface temperature (SST) to assess its relationship with dengue fever in coastal areas. Data on confirmed dengue cases, demographics, precipitation, and air temperature were collected. Incidence of weekly dengue cases was examined. Stepwise multiple regression analyses (AIC model selection) were used to assess which environmental variables best explained increased dengue incidence rates. SST, minimum air temperature, precipitation, and humidity substantially explained 42% of the observed variation (r2=0.42). Infectious diseases are characterized by the influence of past cases on current cases and results show that previous dengue cases alone explained 89% of the variation. Ordinary least-squares analyses showed a positive trend of 0.20±0.03°C in SST from 2006 to 2015. An important element of this study is to help develop strategic recommendations for public health officials in Mexico by providing a simple early warning capability for dengue incidence.
    Keywords air temperature ; coasts ; demographic statistics ; dengue ; El Nino ; environmental factors ; humidity ; least squares ; models ; prediction ; public health ; risk ; surface water temperature ; vector-borne diseases ; Mexico ; Pacific Ocean ; South America
    Language English
    Dates of publication 2017-08
    Size p. 50-57.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 210415-5
    ISSN 1873-6254 ; 0001-706X
    ISSN (online) 1873-6254
    ISSN 0001-706X
    DOI 10.1016/j.actatropica.2017.04.017
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Study of Aedes aegypti population with emphasis on the gonotrophic cycle length and identification of arboviruses

    Julian E. Garcia-Rejon / Armando Ulloa-Garcia / Nohemi Cigarroa-Toledo / Angelica Pech-May / Carlos Machain-Williams / Rosa Carmina Cetina-Trejo / Lourdes Gabriela Talavera-Aguilar / Oswaldo Margarito Torres-Chable / Juan Carlos Navarro / Carlos Marcial Baak-Baak

    Revista do Instituto de Medicina Tropical de São Paulo, Vol 60, Iss

    implications for vector management in cemeteries

    2018  

    Abstract: ABSTRACT Aedes aegypti is the vector of the arboviruses causing dengue, chikungunya and zika infections in Mexico. However, its presence in public places has not been fully evaluated. In a cemetery from Merida, Yucatan, Mexico, the productivity of Ae. ... ...

    Abstract ABSTRACT Aedes aegypti is the vector of the arboviruses causing dengue, chikungunya and zika infections in Mexico. However, its presence in public places has not been fully evaluated. In a cemetery from Merida, Yucatan, Mexico, the productivity of Ae. aegypti, the gonotrophic cycle, and the presence of Ae. aegypti females infected with arboviruses were evaluated. Immature and adult mosquitoes were inspected every two months between April 2016 to June 2017. For the gonotrophic cycle length, the daily pattern of total and parous female ratio was registered and was analyzed using time series analysis. Ae. aegypti females were sorted into pools and assayed for flavivirus RNA by RT-PCR and Sanger sequencing. Aedes aegypti immatures represented 82.86% (8,627/10,411) of the collection. In total, 1,648 Ae. aegypti females were sorted into 166 pools. Two pools were positive; one for dengue virus (DENV-1) and the other for zika virus (ZIKV). The phylogenetic analysis revealed that the DENV-1 is more closely related to isolates from Brazil. While ZIKV is more closely related to the Asian lineage, which were isolates from Guatemala and Mexico. We report some evidence of vertical transmission of DENV-1 in nulliparous females of Ae. aegypti. The gonotrophic cycle was four and three days in the rainy and dry season, respectively. The cemetery of Merida is an important focus of Ae. aegypti proliferation, and these environments may play a role in arboviruses transmission; probably limiting the efficacy of attempts to suppress the presence of mosquitoes in domestic environments.
    Keywords Arbovirus ; Dengue ; Mexico ; Daily survival ; Zika virus ; Arctic medicine. Tropical medicine ; RC955-962
    Subject code 590
    Language English
    Publishing date 2018-08-01T00:00:00Z
    Publisher Universidade de São Paulo
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Entomological and virological surveillance for dengue virus in churches in Merida, Mexico

    Carlos Marcial Baak-Baak / Nohemi Cigarroa-Toledo / Angelica Pech-May / Guadalupe A. Cruz-Escalona / Rosa C. Cetina-Trejo / Julio C. Tzuc-Dzul / Lourdes Gabriela Talavera-Aguilar / Suemy Flores-Ruiz / Carlos Machain-Williams / Oswaldo Margarito Torres-Chable / Bradley J. Blitvich / Jorge Mendez-Galvan / Julian E. Garcia-Rejon

    Revista do Instituto de Medicina Tropical de São Paulo, Vol 61, Iss

    2019  

    Abstract: ABSTRACT This study was designed to assess whether churches in endemic dengue districts in Merida, Mexico provide suitable breeding habitats for mosquitoes and are potential sites for dengue virus (DENV) transmission. Churches were inspected for immature ...

    Abstract ABSTRACT This study was designed to assess whether churches in endemic dengue districts in Merida, Mexico provide suitable breeding habitats for mosquitoes and are potential sites for dengue virus (DENV) transmission. Churches were inspected for immature and adult mosquitoes once every week from November 2015 to October 2016. A total of 10,997 immatures of five species were collected. The most abundant species were Aedes aegypti (6,051) and Culex quinquefasciatus (3,018). The most common source of immature Ae. aegypti were buckets followed by disposable containers. Adult collections yielded 21,226 mosquitoes of nine species. The most common species were Cx. quinquefasciatus (15,215) and Ae. aegypti (3,902). Aedes aegypti were found all year long. Female Ae. aegypti (1,380) were sorted into pools (166) and assayed for flavivirus RNA by RT-PCR and Sanger sequencing. Two pools were positive for DENV (DENV-1 and 2). In conclusion, we demonstrated that some churches in Merida are infested with mosquitoes all year long and they potentially serve as sites for DENV transmission and should therefore be considered for inclusion in mosquito and arboviruses control and surveillance efforts.
    Keywords Aedes aegypti ; Flavivirus ; Mosquitoes ; Dengue ; Arctic medicine. Tropical medicine ; RC955-962
    Subject code 590
    Language English
    Publishing date 2019-02-01T00:00:00Z
    Publisher Universidade de São Paulo
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article: Mosquito Fauna in Home Environments of Tabasco, Mexico

    Torres-Chable, Oswaldo M / Carlos M. Baak-Baak / Carlos Machain-Williams / Claudia V. Zaragoza-Vera / Guadalupe Arjona-Jimenez / Julian E. Garcia-Rejon / Lluvia G. Moreno-Perez / Nohemi Cigarroa-Toledo

    Southwestern entomologist. 2017 Dec., v. 42, no. 4

    2017  

    Abstract: The aim of this study was to assess the biodiversity of mosquito species in houses of the five ecological regions and update the checklist of species previously reported in the state of Tabasco. In total, 325 dwellings at 43 localities in the five ... ...

    Abstract The aim of this study was to assess the biodiversity of mosquito species in houses of the five ecological regions and update the checklist of species previously reported in the state of Tabasco. In total, 325 dwellings at 43 localities in the five ecological regions were sampled. Collection was by entomological CDC backpack aspirator. The mosquitoes captured were identified using published taxonomic keys and the aid of a stereomicroscope. In total, 4,622 mosquitoes of 15 species in 10 genera were captured. Two species not previously reported in Tabasco State were found: Aedes (Ochlerotatus) angustivittatus (Dyar and Knab, 1907) and Mansonia dyari Belkin, Heinemann & Page, 1970. The mosquito fauna of the state of Tabasco, including the new species are 55 species in 17 genera. Most species found transmit diseases to humans and should be included in government mosquito control programs.
    Keywords Aedes ; biodiversity ; ecoregions ; fauna ; humans ; Mansonia dyari ; mosquito control ; new species ; Ochlerotatus ; taxonomic keys ; Mexico
    Language English
    Dates of publication 2017-12
    Size p. 969-982.
    Publishing place Society of Southwestern Entomologists
    Document type Article
    ZDB-ID 2486577-1
    ISSN 0147-1724
    ISSN 0147-1724
    DOI 10.3958/059.042.0416
    Database NAL-Catalogue (AGRICOLA)

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  10. Article: First Report of Chewing Lice Heterodoxus spiniger (Enderlein, 1909) and Trichodectes canis (De Geer, 1778) on Domestic Dogs at Tabasco, Mexico

    Torres-Chable, Oswaldo M / Carlos M. Baak-Baak / Carlos Machain-Williams / Claudia V. Zaragoza-Vera / Guadalupe Arjona-Jimenez / Julian E. Garcia-Rejon / Lluvia G. Moreno-Perez / Nohemi Cigarroa-Toledo / Pablo Medina-Perez

    Southwestern entomologist. 2017 June, v. 42, no. 2

    2017  

    Abstract: Lice are small wingless insects in the order Phthiraptera. Historically, the chewing louse Heterodoxus spiniger (Enderlein) was described from marsupials to the domestic dog (Canis lupus familiaris L.). Clinical manifestations of infestations by chewing ... ...

    Abstract Lice are small wingless insects in the order Phthiraptera. Historically, the chewing louse Heterodoxus spiniger (Enderlein) was described from marsupials to the domestic dog (Canis lupus familiaris L.). Clinical manifestations of infestations by chewing lice are characterized by intense irritation and inflammation of the skin. We found six of 337 domiciled dogs from Tabasco State, Southeastern Mexico infested by chewing lice. Dogs were systematically examined, and ectoparasites were removed using a fine-toothed comb. Lice were deposited on a white sheet of paper and placed into plastic containers. The dog houses sampled were typically small and built of cement, and most inhabitants lived in vulnerable conditions. This is the first record of H. spiniger and the dog biting louse, Trichodectes canis (De Geer), infesting domestic dogs in Mexico. H. spiniger was present in the six dogs infested by lice, and T. canis co-infested one of them. Therefore, six infested dogs (100%) were positive for H. spiniger and one (17%) for T. canis. The importance of this report is that both ectoparasites are recognized as vectors of zoonotic diseases. Further studies are needed to clarify lice distribution, prevalence, and vectorial importance of neglected parasitic infections in Southeast Mexico.
    Keywords animal housing ; Canis lupus ; cement ; disease vectors ; dog diseases ; dogs ; Heterodoxus spiniger ; inflammation ; insects ; lice ; Metatheria ; parasitoses ; Trichodectes canis ; zoonoses ; Mexico
    Language English
    Dates of publication 2017-06
    Size p. 409-418.
    Publishing place Society of Southwestern Entomologists
    Document type Article
    ZDB-ID 2486577-1
    ISSN 0147-1724
    ISSN 0147-1724
    DOI 10.3958/059.042.0211
    Database NAL-Catalogue (AGRICOLA)

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