Browsing by Autor "Roberto Jimmy Revollo"

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    Epidemiological analysis of the influenza A(H1N1)v outbreak in Bolivia, May-August 2009
    (European Centre for Disease Prevention and Control, 2009) Alberto Gianella; Azibadighi Walter; Roberto Jimmy Revollo; Roxana Loayza; Jorge Vargas; Yelin Roca
    The outbreak of pandemic influenza (H1N1) began in Bolivia on 25 May 2009. Between May and August, the National Center of Tropical Disease (CENETROP) analysed by RT-PCR 7,060 samples of which 12.7% were positive. A preliminary analysis of the 895 confirmed cases identified between May and August 2009 describes epidemiological and clinical characteristics. After the first imported cases from the United States and Peru, the locally acquired infections predominated (90%). The number of cases was highest in the age group of 10 to 29 year-olds, and 89.6% of cases were observed in people under the age of 40 years. Fever, cough, nasal discharge and headache remained the main symptoms.
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    Molecular Epidemiological Analysis of Dengue Fever in Bolivia from 1998 to 2008
    (Mary Ann Liebert, Inc., 2009) Yelin Roca; Cécile Baronti; Roberto Jimmy Revollo; Shelley Cook; Roxana Loayza; Läétitia Ninove; Roberto Fernández; Jorge Vargas Flores; Jean-Pierre Hervé; Xavier de Lamballerie
    Dengue fever was first recognized in Bolivia in 1931. However, very limited information was available to date regarding the genetic characterization and epidemiology of Bolivian dengue virus strains. Here, we performed genetic characterization of the full-length envelope gene of 64 Bolivian isolates from 1998 to 2008 and investigated their origin and evolution to determine whether strains circulated simultaneously or alternatively, and whether or not multiple introductions of distinct viral variants had occurred during the period studied. We determined that, during the last decade, closely related viruses circulated during several consecutive years (5, 6, and 6 years for DENV-1, DENV-2, and DENV-3, respectively) and the co-circulation of two or even three serotypes was observed. Emergence of new variants (distinct from those identified during the previous episodes) was identified in the case of DENV-1 (2007 outbreak) and DENV-2 (2001 outbreak). In all cases, it is likely that the viruses originated from neighboring countries.