Interactions Between the Invasive Burmese Python, Python Bivittatus Kuhl, and the Local Mosquito Community in Florida, USA Lawrence E
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Data-Driven Identification of Potential Zika Virus Vectors Michelle V Evans1,2*, Tad a Dallas1,3, Barbara a Han4, Courtney C Murdock1,2,5,6,7,8, John M Drake1,2,8
RESEARCH ARTICLE Data-driven identification of potential Zika virus vectors Michelle V Evans1,2*, Tad A Dallas1,3, Barbara A Han4, Courtney C Murdock1,2,5,6,7,8, John M Drake1,2,8 1Odum School of Ecology, University of Georgia, Athens, United States; 2Center for the Ecology of Infectious Diseases, University of Georgia, Athens, United States; 3Department of Environmental Science and Policy, University of California-Davis, Davis, United States; 4Cary Institute of Ecosystem Studies, Millbrook, United States; 5Department of Infectious Disease, University of Georgia, Athens, United States; 6Center for Tropical Emerging Global Diseases, University of Georgia, Athens, United States; 7Center for Vaccines and Immunology, University of Georgia, Athens, United States; 8River Basin Center, University of Georgia, Athens, United States Abstract Zika is an emerging virus whose rapid spread is of great public health concern. Knowledge about transmission remains incomplete, especially concerning potential transmission in geographic areas in which it has not yet been introduced. To identify unknown vectors of Zika, we developed a data-driven model linking vector species and the Zika virus via vector-virus trait combinations that confer a propensity toward associations in an ecological network connecting flaviviruses and their mosquito vectors. Our model predicts that thirty-five species may be able to transmit the virus, seven of which are found in the continental United States, including Culex quinquefasciatus and Cx. pipiens. We suggest that empirical studies prioritize these species to confirm predictions of vector competence, enabling the correct identification of populations at risk for transmission within the United States. *For correspondence: mvevans@ DOI: 10.7554/eLife.22053.001 uga.edu Competing interests: The authors declare that no competing interests exist. -
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1 Exploring the male-induced female reproduction of Schistosoma mansoni in a novel medium Jipeng Wang1, Rui Chen1, James Collins1 1) UT Southwestern Medical Center. Schistosomiasis is a neglected tropical disease caused by schistosome parasites that infect over 200 million people. The prodigious egg output of these parasites is the sole driver of pathology due to infection. Female schistosomes rely on continuous pairing with male worms to fuel the maturation of their reproductive organs, yet our understanding of their sexual reproduction is limited because egg production is not sustained for more than a few days in vitro. Here, we explore the process of male-stimulated female maturation in our newly developed ABC169 medium and demonstrate that physical contact with a male worm, and not insemination, is sufficient to induce female development and the production of viable parthenogenetic haploid embryos. By performing an RNAi screen for genes whose expression was enriched in the female reproductive organs, we identify a single nuclear hormone receptor that is required for differentiation and maturation of germ line stem cells in female gonad. Furthermore, we screen genes in non-reproductive tissues that maybe involved in mediating cell signaling during the male-female interplay and identify a transcription factor gli1 whose knockdown prevents male worms from inducing the female sexual maturation while having no effect on male:female pairing. Using RNA-seq, we characterize the gene expression changes of male worms after gli1 knockdown as well as the female transcriptomic changes after pairing with gli1-knockdown males. We are currently exploring the downstream genes of this transcription factor that may mediate the male stimulus associated with pairing. -
Eastern Equine Encephalitis (EEE) Description
Eastern Equine Importance Eastern, Western, and Venezuelan equine encephalomyelitis are mosquito-borne, Encephalomyelitis, viral infections that can cause severe encephalitis in horses and humans. Some of Western Equine these viruses also cause disease occasionally in other mammals and birds. No specific treatment is available, and depending on the virus and host, the case fatality rate may Encephalomyelitis and be as high as 90%. As a result of vaccination, severe Eastern (EEE) and Western (WEE) equine encephalomyelitis epidemics no longer occur regularly in the U.S., but Venezuelan Equine sporadic cases and small outbreaks are still seen. Epidemic Venezuelan equine Encephalomyelitis encephalomyelitis (VEE) viruses continue to emerge periodically in South America, and sweep through equine and human populations. One two-year VEE epidemic, Sleeping Sickness which began in 1969, extended from South America to the southern U.S., and caused an estimated 38,000-50,000 cases in equids. Epidemic VEE viruses are also potential Eastern Equine Encephalomyelitis bioterrorist weapons. (EEE) –Eastern Equine Encephalitis, Eastern Encephalitis Etiology Eastern, Western and Venezuelan equine encephalomyelitis result from infection Western Equine Encephalomyelitis by the respectively named viruses in the genus Alphavirus (family Togaviridae). In (WEE) –Western Equine Encephalitis the human literature, the disease is usually called Eastern, Western or Venezuelan equine encephalitis rather than encephalomyelitis. Venezuelan Equine Encephalomyelitis (VEE) –Peste Loca, Venezuelan Equine Eastern equine encephalomyelitis virus Encephalitis, Venezuelan Encephalitis, The numerous isolates of the Eastern equine encephalomyelitis virus (EEEV) can Venezuelan Equine Fever be grouped into two variants. The variant found in North America is more pathogenic than the variant that occurs in South and Central America. -
The Nuclear 18S Ribosomal Dnas of Avian Haemosporidian Parasites Josef Harl1, Tanja Himmel1, Gediminas Valkiūnas2 and Herbert Weissenböck1*
Harl et al. Malar J (2019) 18:305 https://doi.org/10.1186/s12936-019-2940-6 Malaria Journal RESEARCH Open Access The nuclear 18S ribosomal DNAs of avian haemosporidian parasites Josef Harl1, Tanja Himmel1, Gediminas Valkiūnas2 and Herbert Weissenböck1* Abstract Background: Plasmodium species feature only four to eight nuclear ribosomal units on diferent chromosomes, which are assumed to evolve independently according to a birth-and-death model, in which new variants origi- nate by duplication and others are deleted throughout time. Moreover, distinct ribosomal units were shown to be expressed during diferent developmental stages in the vertebrate and mosquito hosts. Here, the 18S rDNA sequences of 32 species of avian haemosporidian parasites are reported and compared to those of simian and rodent Plasmodium species. Methods: Almost the entire 18S rDNAs of avian haemosporidians belonging to the genera Plasmodium (7), Haemo- proteus (9), and Leucocytozoon (16) were obtained by PCR, molecular cloning, and sequencing ten clones each. Phy- logenetic trees were calculated and sequence patterns were analysed and compared to those of simian and rodent malaria species. A section of the mitochondrial CytB was also sequenced. Results: Sequence patterns in most avian Plasmodium species were similar to those in the mammalian parasites with most species featuring two distinct 18S rDNA sequence clusters. Distinct 18S variants were also found in Haemopro- teus tartakovskyi and the three Leucocytozoon species, whereas the other species featured sets of similar haplotypes. The 18S rDNA GC-contents of the Leucocytozoon toddi complex and the subgenus Parahaemoproteus were extremely high with 49.3% and 44.9%, respectively. -
Common Malaria Mosquito Anopheles Quadrimaculatus Say (Insecta: Diptera: Culicidae)1 Leslie M
EENY 491 Common Malaria Mosquito Anopheles quadrimaculatus Say (Insecta: Diptera: Culicidae)1 Leslie M. Rios and C. Roxanne Connelly2 Introduction Anopheles quadrimaculatus Say is historically the most important vector of malaria in the eastern United States. Malaria was a serious plague in the United States for centuries until its final eradication in the 1950s (Rutledge et al. 2005). Despite the ostensible eradication, there are occasional cases of autochthonous (local) transmission in the U.S. vectored by An. quadrimaculatus (CDC 2003). In addition to being a vector of pathogens, An. quadri- maculatus can also be a pest species (O’Malley 1992). This species has been recognized as a complex of five sibling species (Reinert et al. 1997) and is commonly referred to as An. quadrimaculatus (sensu lato) when in a collection or identified in the field. The most common hosts are large mammals including humans. Synonymy Anopheles annulimanus Van der Wulp Figure 1. Adult female common malaria mosquito, Anopheles quadrimaculatus Say. (From Systematic Catalog of the Culicidae, Walter Reed Credits: Sean McCann, University of Florida Biosystematics Unit) Distribution Anopheles quadrimaculatus mosquitoes are primarily seen in eastern North America. They are found in the eastern United States, the southern range of Canada, and parts of Mexico south to Vera Cruz. The greatest abundance occurs 1. This document is EENY 491, one of a series of the Department of Entomology and Nematology, UF/IFAS Extension. Original publication date February 2009. Revised August 2015. Reviewed October 2018. Visit the EDIS website at https://edis.ifas.ufl.edu for the currently supported version of this publication. -
Candidate Vectors and Rodent Hosts of Venezuelan Equine Encephalitis Virus, Chiapas, 2006–2007
Am. J. Trop. Med. Hyg., 85(6), 2011, pp. 1146–1153 doi:10.4269/ajtmh.2011.11-0094 Copyright © 2011 by The American Society of Tropical Medicine and Hygiene Candidate Vectors and Rodent Hosts of Venezuelan Equine Encephalitis Virus, Chiapas, 2006–2007 Eleanor R. Deardorff ,* Jose G. Estrada-Franco , Jerome E. Freier , Roberto Navarro-Lopez , Amelia Travassos Da Rosa , Robert B. Tesh , and Scott C. Weaver Institute for Human Infections and Immunity, WHO Collaborating Center for Tropical Diseases, and Department of Pathology, University of Texas Medical Branch, Galveston, Texas; Department of Agriculture, Fort Collins, Colorado; Comision Mexico-Estado Unidos para la Prevencion de la Fiebre Aftosa y Otras Enfermedades Exoticas de los Animales, Mexico City, Mexico Abstract. Enzootic Venezuelan equine encephalitis virus (VEEV) has been known to occur in Mexico since the 1960s. The first natural equine epizootic was recognized in Chiapas in 1993 and since then, numerous studies have characterized the etiologic strains, including reverse genetic studies that incriminated a specific mutation that enhanced infection of epizootic mosquito vectors. The aim of this study was to determine the mosquito and rodent species involved in enzootic maintenance of subtype IE VEEV in coastal Chiapas. A longitudinal study was conducted over a year to discern which species and habitats could be associated with VEEV circulation. Antibody was rarely detected in mammals and virus was not isolated from mosquitoes. Additionally, Culex ( Melanoconion ) taeniopus populations were found to be spatially related to high levels of human and bovine seroprevalence. These mosquito populations were concentrated in areas that appear to represent foci of stable, enzootic VEEV circulation. -
Mosquito Systematics VOL. 80) 1976 the ANOPHELES
Mosquito Systematics VOL. 80) 1976 THE ANOPHELES(ANOPHELES) CRUCIANS SUBGROUP IN THE UNITED STATES (DIPTERA: CULICIDAE)l BY 2 3 4 Thomas G. Floore , Bruce A. Harrison and Bruce F. Eldridge ABSTRACT. AnopheZes (AnopheZes) bradley; King, An. (Am.) crucians Wiedemann and An. (Am,) georgianus King are taxonomically redefined by morphology, eth- ology and distribution, and established as the crueians subgroup of the An. (Ano. I punetipennk (Say) species group. This study involved the examination of over 1,800 specimens and the preparation of 15 full-page illustrations. Species descriptions include sections on: type-data, synonymy, descriptions of female, male,pupa, and larva, distribution, taxonomic discussion, biono- mics and medical importance. Keys for the erueians subgroup are presented for male genitalia, pupae and 4th stage larvae. Additional keys are present- ed, in an appendix, to separate the erueians subgroup from the other southeas- tern United States anophelines. The 1st through 4th stage larvae of bradZeyi and erueians, the 4th stage larva of georgtinus and the pupae of bradkyi and georgianus are completely illustrated for the first time. Tables with the ranges of setal branching are included for the 4th stage larvae and pupae of each species. 'This work was supported in part by Research Contract DAMD-17-74-C-4086 from the U. S. Army Medical Research and Development Command, Office of the Sur- geon General, through the Medical Entomology Project (MEP), Smithsonian In- stitution, Washington, D. C. 20560. 2 Environmental Services Department, P. 0. Box 658, Eaton Park, Florida 33840. 3 Department of Entomology, North Carolina State University, Raleigh, North Carolina 27607. -
The Historical Ecology of Human and Wild Primate Malarias in the New World
Diversity 2010, 2, 256-280; doi:10.3390/d2020256 OPEN ACCESS diversity ISSN 1424-2818 www.mdpi.com/journal/diversity Article The Historical Ecology of Human and Wild Primate Malarias in the New World Loretta A. Cormier Department of History and Anthropology, University of Alabama at Birmingham, 1401 University Boulevard, Birmingham, AL 35294-115, USA; E-Mail: [email protected]; Tel.: +1-205-975-6526; Fax: +1-205-975-8360 Received: 15 December 2009 / Accepted: 22 February 2010 / Published: 24 February 2010 Abstract: The origin and subsequent proliferation of malarias capable of infecting humans in South America remain unclear, particularly with respect to the role of Neotropical monkeys in the infectious chain. The evidence to date will be reviewed for Pre-Columbian human malaria, introduction with colonization, zoonotic transfer from cebid monkeys, and anthroponotic transfer to monkeys. Cultural behaviors (primate hunting and pet-keeping) and ecological changes favorable to proliferation of mosquito vectors are also addressed. Keywords: Amazonia; malaria; Neotropical monkeys; historical ecology; ethnoprimatology 1. Introduction The importance of human cultural behaviors in the disease ecology of malaria has been clear at least since Livingstone‘s 1958 [1] groundbreaking study describing the interrelationships among iron tools, swidden horticulture, vector proliferation, and sickle cell trait in tropical Africa. In brief, he argued that the development of iron tools led to the widespread adoption of swidden (―slash and burn‖) agriculture. These cleared agricultural fields carved out a new breeding area for mosquito vectors in stagnant pools of water exposed to direct sunlight. The proliferation of mosquito vectors and the subsequent heavier malarial burden in human populations led to the genetic adaptation of increased frequency of sickle cell trait, which confers some resistance to malaria. -
University of Florida Thesis Or Dissertation
ECOLOGY OF CULEX (MELANOCONION) CEDECEI, VECTOR OF EVERGLADES VIRUS IN FLORIDA By ISAIAH J. HOYER A THESIS PRESENTED TO THE GRADUATE SCHOOL OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE UNIVERSITY OF FLORIDA 2017 © 2017 Isaiah J. Hoyer To my father, Kevin R. Hoyer and mother Ava L. Hoyer. You have both supported me from Alaska to Florida, and everywhere in between. ACKNOWLEDGMENTS I would like to thank Dr. Nathan Burkett-Cadena for his guidance and council. Much of the work presented is attributed to Dr. Burkett-Cadena’s ingenuity and shared interest in sylvatic cycles of mosquito-host interactions. I thank Dr. Jonathan Day and Dr. Phil Lounibos for their insightful feedback and support. I extend my gratitude to Dr. Erik Blosser for his occasional visits to the field, shared knowledge, and support. I thank Lary Reeves for acquiring the Everglades National Park permit, his company in the Everglades, and his contagious broad exuberant enthusiasm for the natural world. I further extend my thanks to the FMEL technicians who performed a large part of bloodmeal extractions and PCR assays, Carolina Acevedo, Tanise Stenn, Anna Thompson, and Jordan Vann; additionally, thanking Glauber Rocha Pereira for his assistance identifying CO2-baited CDC light-trap mosquito samples. Lastly, I express warm regards to my friends and family for their unwavering encouragement. 4 TABLE OF CONTENTS page ACKNOWLEDGMENTS ........................................................................................... -
Patterns of Abundance, Host Use, and Everglades Virus Infection in Culex (Melanoconion) Cedecei Mosquitoes, Florida, USA Isaiah J
Patterns of Abundance, Host Use, and Everglades Virus Infection in Culex (Melanoconion) cedecei Mosquitoes, Florida, USA Isaiah J. Hoyer, Carolina Acevedo, Keenan Wiggins, Barry W. Alto, Nathan D. Burkett-Cadena Everglades virus (EVEV), subtype II within the Venezuelan (8,11). Studies in Panama concluded that Cx. panocossa equine encephalitis (VEE) virus complex, is a mosquito- (as Cx. aikenii) mosquitoes were the most important VEE borne zoonotic pathogen endemic to south Florida, USA. vector on the basis of high VEE experimental transmission EVEV infection in humans is considered rare, probably be- rates (9), high experimental infection rates (9), high popu- cause of the sylvatic nature of the vector, the Culex (Mela- lation density (9), and feeding upon VEE reservoir hosts noconion) cedecei mosquito. The introduction of Cx. pano- (10,11). The establishment of Cx. panocossa mosquitoes in cossa, a tropical vector mosquito of VEE virus subtypes that inhabits urban areas, may increase human EVEV exposure. urban areas could link sylvatic transmission foci of EVEV Field studies investigating spatial and temporal patterns of with densely populated areas such as the greater Miami abundance, host use, and EVEV infection of Cx. cedecei metropolitan area through vegetated canals (8). mosquitoes in Everglades National Park found that vector Evidence of sporadic human infections with EVEV in abundance was dynamic across season and region. Ro- south Florida in the 1960s (12,13) spurred numerous field dents, particularly Sigmodon hispidus rats, were primary and laboratory studies to investigate the natural transmis- vertebrate hosts, constituting 77%–100% of Cx. cedecei sion cycle of the virus, focusing on determining the natural blood meals. -
Highly Rearranged Mitochondrial Genome in Nycteria Parasites (Haemosporidia) from Bats
Highly rearranged mitochondrial genome in Nycteria parasites (Haemosporidia) from bats Gregory Karadjiana,1,2, Alexandre Hassaninb,1, Benjamin Saintpierrec, Guy-Crispin Gembu Tungalunad, Frederic Arieye, Francisco J. Ayalaf,3, Irene Landaua, and Linda Duvala,3 aUnité Molécules de Communication et Adaptation des Microorganismes (UMR 7245), Sorbonne Universités, Muséum National d’Histoire Naturelle, CNRS, CP52, 75005 Paris, France; bInstitut de Systématique, Evolution, Biodiversité (UMR 7205), Sorbonne Universités, Muséum National d’Histoire Naturelle, CNRS, Université Pierre et Marie Curie, CP51, 75005 Paris, France; cUnité de Génétique et Génomique des Insectes Vecteurs (CNRS URA3012), Département de Parasites et Insectes Vecteurs, Institut Pasteur, 75015 Paris, France; dFaculté des Sciences, Université de Kisangani, BP 2012 Kisangani, Democratic Republic of Congo; eLaboratoire de Biologie Cellulaire Comparative des Apicomplexes, Faculté de Médicine, Université Paris Descartes, Inserm U1016, CNRS UMR 8104, Cochin Institute, 75014 Paris, France; and fDepartment of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697 Contributed by Francisco J. Ayala, July 6, 2016 (sent for review March 18, 2016; reviewed by Sargis Aghayan and Georges Snounou) Haemosporidia parasites have mostly and abundantly been de- and this lack of knowledge limits the understanding of the scribed using mitochondrial genes, and in particular cytochrome evolutionary history of Haemosporidia, in particular their b (cytb). Failure to amplify the mitochondrial cytb gene of Nycteria basal diversification. parasites isolated from Nycteridae bats has been recently reported. Nycteria parasites have been primarily described, based on Bats are hosts to a diverse and profuse array of Haemosporidia traditional taxonomy, in African insectivorous bats of two fami- parasites that remain largely unstudied. -
Apicomplexa: Haemosporina: Garniidae), a Blood Parasite of the Brazilian Lizard Thecodactylus Rapicaudus (Squamata: Gekkonidae)
Article available at http://www.parasite-journal.org or http://dx.doi.org/10.1051/parasite/1999063209 GARNIA KARYOLYTICA N. SP. (APICOMPLEXA: HAEMOSPORINA: GARNIIDAE), A BLOOD PARASITE OF THE BRAZILIAN LIZARD THECODACTYLUS RAPICAUDUS (SQUAMATA: GEKKONIDAE) LAINSON R.* & NAIFF R.D.** Summary: Résumé : GARNIA KARYOLYTICA N. SP. (APICOMPLEXA : HAEMOSPORINA : GARNIIDAE) PARASITE DU SANG DU LÉZARD BRÉSILIEN Development of meronts and gametocytes of Garnia karyolytica THECODACTYLUS RAPICAUDUS (SQUAMATA : GEKKONIDAE) nov.sp., is described in erythrocytes of the neotropical forest gecko Thecodactylus rapicaudus from Para State, north Brazil. Description du développement des mérontes et des gamétocytes Meronts are round to subpherical and predominantly polar in de Garnia karyolytica n. sp., parasite des érythrocytes du gecko position: forms reaching 1 2.0 x 10.0 µm contain from de forêts néotropicales Thecodactylus rapicaudus, capturé dans 20-28 nuclei. Macrogametocytes and microgametocytes are l'état de Para (Nord Brésil). Les mérontes, arrondis à predominantly elongate, lateral in the erythrocyte and average subsphériques le plus souvent en position polaire, mesurent 16.6 x 6.3pm and 15.25 x 6.24 µm respectively. Occasional 12,0 x 10,0 µm et contiennent 20 à 28 noyaux. Les spherical forms of both sexes occur in a polar or lateropolar macrogamétocytes et les microgamétocytes sont le plus souvent position. All stages of development are devoid of malarial allongés, en position latérale dans l'hématie et mesurent en pigment. They have a progressively lytic effect on the host-cell moyenne respectivement 16,6 x 6,3 µm et 15,25 x 6,24 µm. nucleus, particularly the mature gametocytes, which enlarge and Parfois des formes sphériques des deux sexes se trouvent en deform the erythrocyte.