Browsing by Autor "Naomi Iihoshi"

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An epidemiological study of Taenia solium cysticercosis in a rural population in the Bolivian Chaco
(Elsevier BV, 2001) Juan Carrique‐Mas; Naomi Iihoshi; Marc‐Alain Widdowson; Yelin Roca; G Morales; J. L. Quiroga; F Cejas; M Caihuara; Rodríguez Ibarra; Martyn Edelsten
Detection of kinetoplast DNA of Trypanosoma cruzi from dried feces of triatomine bugs by PCR
(Elsevier BV, 2001) Shinjiro Hamano; Masahiro HORIO; Sachio Miura; Hiroo Higo; Naomi Iihoshi; Kanami Noda; Isao Tada; Tsutomu Takeuchi
Hantavirus Pulmonary Syndrome in Santa Cruz, Bolivia: Outbreak Investigation and Antibody Prevalence Study
(Public Library of Science, 2012) Joel M. Montgomery; Patrick J. Blair; Darin S. Carroll; James N. Mills; Alberto Gianella; Naomi Iihoshi; Ana M. Briggiler; Vidal Felices; Milagros Salazar; James G. Olson
We report the results of an investigation of a small outbreak of hantavirus pulmonary syndrome in 2002 in the Department of Santa Cruz, Bolivia, where the disease had not previously been reported. Two cases were initially reported. The first case was a physician infected with Laguna Negra virus during a weekend visit to his ranch. Four other persons living on the ranch were IgM antibody-positive, two of whom were symptomatic for mild hantavirus pulmonary syndrome. The second case was a migrant sugarcane worker. Although no sample remained to determine the specific infecting hantavirus, a virus 90% homologous with Río Mamoré virus was previously found in small-eared pygmy rice rats (Oligoryzomys microtis) trapped in the area. An antibody prevalence study conducted in the region as part of the outbreak investigation showed 45 (9.1%) of 494 persons to be IgG positive, illustrating that hantavirus infection is common in Santa Cruz Department. Precipitation in the months preceding the outbreak was particularly heavy in comparison to other years, suggesting a possible climatic or ecological influence on rodent populations and risk of hantavirus transmission to humans. Hantavirus infection appears to be common in the Santa Cruz Department, but more comprehensive surveillance and field studies are needed to fully understand the epidemiology and risk to humans.
HELICOBACTER PYLORI SERO-INCIDENCE IN A COHORT OF RURAL BOLIVIAN CHILDREN
(Lippincott Williams & Wilkins, 1998) C Friedman; Mike Glynn; Robert Quick; B Khanna; Naomi Iihoshi; Carmen Revollo; B. D. Gold
58 High seroprevalence rates for Helicobacter pylori (Hp) have been reported in developing countries; however, sero-incidence studies to determine age of initial acquisition and risk factors for seroconversion are lacking. We conducted two seroprevalence studies, 15 months apart, to determine the age-specific sero-incidence rate in a cohort of rural Bolivian children. In 8/96, we conducted a survey of 1,392 children between 6 months and 9 years old, living in 17 rural Bolivian villages, to determine Hp serostatus. In 11/97, we returned to the same villages to conduct a follow-up study. The 15 month age-specific sero-incidence was determined for a cohort of 333 children, 6 months and 6 years old, who either participated in both surveys and were seronegative in the first or were born during the follow-up period. Overall, 36% of 1040 children surveyed in the follow-up study were seropositive, 52% were seronegative, and 12% had indeterminate serostatus. Of 918 children with a definitive Hp serostatus, seroprevalence increased from 4% in children aged 6-11 months to 61% in 6-year olds. In the cohort of 333 children, 64 (19%) seroconverted during the 15 month follow-up period. 15-month sero-incidence rates are summarized in the table below: The largest increase in sero-incidence occurred in children between ages 2 and 3 years old. Further analysis of risk factors for Hp seroconversion (i.e., infection acquisition) focusing on this age group is ongoing.TABLE
HELICOBACTER PYLORI SERO‐INCIDENCE IN A COHORT OF RURAL BOLIVIAN CHILDREN
(Lippincott Williams & Wilkins, 1998) C Friedman; Mike Glynn; Robert Quick; B Khanna; Naomi Iihoshi; Carmen Revollo; B. D. Gold
Lineage Analysis of Circulating Trypanosoma cruzi Parasites and Their Association with Clinical Forms of Chagas Disease in Bolivia
(Public Library of Science, 2010) Florencia del Puerto; Juan Eiki Nishizawa; Mihoko Kikuchi; Naomi Iihoshi; Yelin Roca; Cinthia Avilas; Alberto Gianella; Javier Lora; Freddy Udalrico Gutierrez Velarde; Luis Alberto Renjel
None of the identified lineages or sublineages was significantly associated with any particular clinical manifestations in the chronic Chagas patients in Bolivia.
P42 Dangerous factor of congenital Chagas' disease : the pregnant woman of chronic infection
(Japan Society of Medical Entomology and Zoology, 2001) Sachio Miura; Shinjiro Hamano; Masahiro HORIO; Naomi Iihoshi; Tsutomu Takeuchi
Seroincidence ofHelicobacter pyloriInfection in a Cohort of Rural Bolivian Children: Acquisition and Analysis of Possible Risk Factors
(Oxford University Press, 2002) M. Kathleen Glynn; Cindy R. Friedman; Benjamin D. Gold; Bhawna Khanna; Lori Hutwagner; Naomi Iihoshi; Carmen Revollo; Robert Quick
High seroprevalence rates for Helicobacter pylori are reported in developing countries, yet few seroincidence studies exist that determine age of initial acquisition and risk factors for H. pylori seroconversion. Two H. pylori serosurveys were conducted in August 1996 and November 1997. Of 188 children aged 21 months to 6 years who were seronegative in the first survey, 44 (23%) had seroconverted at follow-up, yielding an 18% annual seroincidence. The largest increase in seroincidence occurred between children aged 2 years (10%) and children aged 3 years (32%). Use of a lidded, narrow-mouthed water vessel was protective against seroconversion (odds ratio [OR], 0.3; 95% confidence interval [CI], 0.1-0.8), and the presence of another H. pylori-seropositive sibling in the household was a risk factor for seroconversion (OR, 3.1; 95% CI, 1.3-8.7). Although not a randomized intervention trial, this study suggests that the use of a narrow-mouthed water vessel may prevent the transmission of H. pylori in households in developing countries.
The validity of serologic tests for Trypanosoma cruzi and the effectiveness of transfusional screening strategies in a hyperendemic region
(Wiley, 2005) Marianne Pirard; Naomi Iihoshi; Marleen Boelaert; Paulino Basanta; Francisco Gomez Lopez; Patrick Van der Stuyft
Routine blood donor screening for T. cruzi with a single test results in unacceptable numbers of false-negative samples in highly endemic areas or in at risk population groups. Adding a second test seems mandatory, but which one to choose depends on local cost components and feasibility.