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47 results on '"Moncayo, Abelardo C."'

4. Heartland Virus in Lone Star Ticks, Alabama, USA

Author

Newman, Brent C., Sutton, William B., Moncayo, Abelardo C., Hughes, Holly R., Taheri, Ali, Moore, Thomas C., Schweitzer, Callie J., and Wang, Yong

Subjects
Transcription (Genetics), Genomics, Health
Abstract

Heartland virus (HRTV) is an emerging pathogenic phlebovirus first identified in the United States in 2009 and now reported in 15 states (1,2). Nymphal lone star ticks (Amblyomma americanum) are [...]

Published
2020
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9. Venezuelan equine encephalitis virus infection of cotton rats

Author

Carrara, Anne-Sophie, Coffey, Lark L., Aguilar, Patricia V., Moncayo, Abelardo C., Travassos Da Rosa, Amelia P.A., Nunes, Marcio R.T., Tesh, Robert B., and Weaver, Scott C.

Subjects
Company distribution practices, Cotton rats -- Diseases, Veterinary epidemiology -- Research
Abstract

Venezuelan equine encephalitis virus (VEEV) is an emerging pathogen of equids and humans, but infection of its rodent reservoir hosts has received little study. To determine whether responses to infection [...]

Published
2007

10. Dengue emergence and adaptation to peridomestic mosquitoes

Author

Moncayo, Abelardo C., Fernandez, Zoraida, Ortiz, Diana, Diallo, Mawlouth, Sall, Amadou, Hartman, Sammie, Davis, C. Todd, Coffey, Lark, Mathiot, Christian C., Tesh, Robert B., and Weaver, Scott C.

Subjects
Virus-vector relationships -- Research, Dengue viruses -- Research, Aedes albopictus -- Research, Aedes -- Research, Communicable diseases -- Research
Abstract

Phylogenetic evidence suggests that endemic and epidemic dengue viruses (DENV), transmitted among humans by the anthropophilic mosquitoes Aedes aegypfi and Ae. albopictus, emerged when ancestral, sylvatic DENV transmitted among nonhuman [...]

Published
2004

11. Endemic Venezuelan equine encephalitis in Northern Peru

Author

Aguilar, Patricia V., Greene, Ivorlyne P., Coffey, Lark L., Medina, Gladys, Moncayo, Abelardo C., Anishchenko, Michael, Ludwig, George V., Turell, Michael J., O'Guinn, Monica L., Lee, John, Tesh, Robert B., Watts, Douglas M., Russell, Kevin L., Hice, Christine, Yanoviak, Stephen, Morrison, Amy C., Klein, Terry A., Dohm, David J., Guzman, Hilda, Travassos da Rosa, Amelia P.A., Guevara, Carolina, Kochel, Tadeusz, Olson, James, Cabezas, Cesar, and Weaver, Scott C.

Subjects
Epidemics -- Control, Epidemics -- Research, Epidemics -- Peru, Equine encephalomyelitis -- Control, Equine encephalomyelitis -- Research
Abstract

Since Venezuelan equine encephalitis virus (VEEV) was isolated in Peru in 1942, >70 isolates have been obtained from mosquitoes, humans, and sylvatic mammals primarily in the Amazon region. To investigate [...]

Published
2004

14. Rickettsia parkeri in Amblyomma americanum ticks, Tennessee and Georgia, USA

Author

Cohen, Sara B., Yabsley, Michael J., Garrison, Laurel E., Freye, James D., Dunlap, Brett G., Dunn, John R., Mead, Daniel G., Jones, Timothy F., and Moncayo, Abelardo C.

Subjects
Polymerase chain reaction -- Usage, Rickettsia -- Health aspects, Rickettsia -- Research, Rickettsial diseases -- Causes of, Rickettsial diseases -- Diagnosis, Rickettsial diseases -- Research
Abstract

The most commonly reported rickettsial human pathogen in the United States is Rickettsia rickettsii, the causative agent of Rocky Mountain spotted fever (RMSF). First identified in 1937 (1), R. parkeri [...]

Published
2009
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20. Dengue Among American Missionaries Returning from Jamaica, 2012

Author

Moncayo, Abelardo C., primary, Harvey, Kira A., additional, Muñoz-Jordan, Jorge L., additional, Thomas, Dana, additional, Hunsperger, Elizabeth, additional, Baumblatt, Jane, additional, Arguello, D. Fermin, additional, Sharp, Tyler M., additional, Sotir, Mark, additional, Stanek, Danielle, additional, Jentes, Emily S., additional, and Atrubin, David, additional

Published
2015
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22. Inadequacy of IgM Antibody Tests for Diagnosis of Rocky Mountain Spotted Fever

Author

McQuiston, Jennifer H., primary, Dunn, John, additional, Morris, Kevin, additional, Carpenter, L. Rand, additional, Moncayo, Abelardo C., additional, Chung, Ida, additional, McElroy, Kristina, additional, Wiedeman, Caleb, additional, Porter, Susan, additional, Kato, Cecilia, additional, Mosites, Emily, additional, and Singleton, Joseph, additional

Published
2014
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23. Eastern Equine Encephalitis in Tennessee: 2002–2008

Author

Mukherjee, Sudeshna, primary, Moody, Erin E., additional, Lewokzco, Kenneth, additional, Huddleston, Dora B., additional, Huang, Junjun, additional, Rowland, Meghan E., additional, Wilson, Ron, additional, Dunn, John R., additional, Jones, Timothy F., additional, and Moncayo, Abelardo C., additional

Published
2012
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24. Infection Prevalences of Common Tick-borne Pathogens in Adult Lone Star Ticks (Amblyomma americanum) and American Dog Ticks (Dermacentor variabilis) in Kentucky

Author

Fritzen, Charissa M., primary, Huang, Junjun, additional, Dunlap, Brett, additional, Moncayo, Abelardo C., additional, Westby, Kathleen, additional, Dunn, John R., additional, Yabsley, Michael J., additional, Jones, Timothy F., additional, Schardein, Mike, additional, and Freye, James D., additional

Published
2011
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31. La Crosse Encephalitis Virus Infection in Field-Collected Aedes albopictus, Aedes japonicus, and Aedes triseriatus in Tennessee.

Author

Westby, Katie M., Fritzen, Charissa, Paulsen, Dave, Poindexter, Stephanie, and Moncayo, Abelardo C.

Abstract

La Crosse virus (LACV) is a mosquito-borne virus and a major cause of pediatric encephalitis in the USA. La Crosse virus emerged in Tennessee and other states in the Appalachian region in 1997. We investigated LACV infection rates and seasonal abundances of the native mosquito vector, Aedes triseriatus, and 2 recently introduced mosquito species, Ae. albopictus and Ae. japonicus, in an emerging disease focus in Tennessee. Mosquitoes were collected using multiple trapping methods specific for Aedes mosquitoes at recent human case sites. Mosquito pools were tested via reverse transcriptase-polymerase chain reaction (RT-PCR) of the S segment to detect multiple Bunyamwera and California serogroup viruses, including LACV, as well as real-time RT-PCR of the M segment. A total of 54 mosquito pools were positive, including wild-caught adult females and laboratory-reared adults, demonstrating transovarial transmission in all 3 species. Maximum likelihood estimates (per 1,000 mosquitoes) were 2.72 for Ae. triseriatus, 3.01 for Ae. albopictus, and 0.63 for Ae. japonicus. We conclude that Ae. triseriatus and Ae. albopictus are important LACV vectors and that Ae. japonicus also may be involved in virus maintenance and transmission. [ABSTRACT FROM AUTHOR]

Published
2015
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42. Allpahuayo Virus: A Newly Recognized Arenavirus (Arenaviridae) from Arboreal Rice Rats (Oecomys Bicolorand Oecomys Paricola) in Northeastern Peru

Author

Moncayo, Abelardo C., Hice, Christine L., Watts, Douglas M., Travassos de Rosa, Amelia P.A., Guzman, Hilda, Russell, Kevin L., Calampa, Carlos, Gozalo, Alfonso, Popov, Vsevolod L., Weaver, Scott C., and Tesh, Robert B.

Abstract

Allpahuayo virus was initially isolated from arboreal rice rats (Oecomys bicolorand Oecomys paricola) collected during 1997 at the Allpahuayo Biological Station in northeastern Peru. Serological and genetic studies identified the virus as a new member of the Tacaribe complex of the genus Arenavirus.The small (S) segment of the Allpahuayo virus prototype strain CLHP-2098 (Accession No. AY012686) was sequenced, as well as that of sympatric isolate CLHP-2472 (Accession No. AY012687), from the same rodent species. The S segment was 3382 bases in length and phylogenetic analysis indicated that Allpahuayo is a sister virus to Pichinde in clade A. Two ambisense, nonoverlapping reading frames were identified, which result in two predicted gene products, a glycoprotein precursor (GPC) and a nucleocapsid protein (NP). A predicted stable single hairpin secondary structure was identified in the intergenic region between GPC and NP. Details of the genetic organization of Allpahuayo virus are discussed.

Published
2001
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45. Meconial Peritrophic Matrix Structure, Formation, and Meconial Degeneration in Mosquito Pupae/Pharate Adults: Histologicaland Ultrastructural Aspects

Author

Moncayo, Abelardo C., Lerdthusnee, Kriangkrai, Leon, Renato, Robich, Rebecca M., and Romoser, William S.

Abstract

The noncellular peritrophic matrix (PM) that forms around the food bolus in the midgut of many arthropod species may influence the fate of ingested microbes. In mosquitoes, PMs have been identified in the pupal as well as larval and adult stages. In pupae, the PMs surround the meconium, the sloughed larval midgut epithelium. Meconial PM1 (MPM1) forms early in the pupal stadium, and a second meconial PM (MPM2) sometimes forms around the time of adult emergence. A recent study suggests that MPMs contribute to the sterilization of the adult midgut by sequestering microorganisms ingested during the larval stage, which, along with remaining meconial material, are egested after adult emergence. We have compared MPM1 formation and patterns of meconial degeneration in representative species in five mosquito genera and identified a temporal association between MPM1 formation, meconial degeneration, and apolysis. Ultrastructural study of MPM1 and MPM2 in Aedes aegypti (L.) revealed that MPM1 seems to be structurally different from either the larval or adult PMs, whereas MPM2 more closely resembles PM formed around a bloodmeal in adult females. Our results are consistent with the microbial sequestration role.

Published
2005
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47. Prevalence of Ehrlichia chaffeensis and Ehrlichia ewingii in ticks from Tennessee.

Author

Cohen SB, Yabsley MJ, Freye JD, Dunlap BG, Rowland ME, Huang J, Dunn JR, Jones TF, and Moncayo AC

Subjects
Animals, Arthropod Vectors, Demography, Female, Male, Nymph microbiology, Tennessee, Ehrlichia isolation & purification, Ixodidae microbiology
Abstract

Human ehrlichiosis is the second most common tick-borne disease reported in Tennessee after Rocky Mountain spotted fever. Two closely related ehrlichiae, Ehrlichia chaffeensis and Ehrlichia ewingii, are both causative agents of human disease and are transmitted by Amblyomma americanum, the lone star tick. Prevalence rates and distribution patterns of these pathogens among ticks in Tennessee are currently unknown. To understand prevalence and exposure risk of Ehrlichia spp., we tested 616 ticks (309 Amblyomma americanum (L.), 277 Dermacentor variabilis (Say), 17 Ixodes texanus (Banks), 7 Ixodes cookei Packard, 4 Ixodes scapularis (Say), and 2 Amblyomma maculatum Koch) from 46 counties for E. chaffeensis and 324 ticks (238 A. americanum and 86 D. variabilis) from 29 counties for E. ewingii. Overall, E. chaffeensis was detected in 2.6% (8/309) of A. americanum and E. ewingii in 0.8% (2/238). Ehrlichia spp. DNA was not detected in any tick species other than A. americanum. Although sample sizes were low in many counties, all positive ticks were identified in the Interior Plateau and Southeastern Plains ecoregions which is where the majority of human ehrlichiosis cases are reported from Tennessee (e.g., 66.3% of the human cases in 2008 are from the Interior Plateau ecoregion). The data from this pathogen survey combined with frequent human case reports from certain areas indicate potential "hot spots" for ehrlichiosis infection. Targeted vector control interventions in these areas may help decrease human ehrlichiosis transmission.

Published
2010
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