Browsing by Author "Ahumada, Rodrigo"

Now showing 1 - 4 of 4
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    CD4/CD8 ratio as a predictor of the response to HBV vaccination in HIV-positive patients : a prospective cohort study
    (2016) Acuña, P.; Peirano, F.; Fuster, F.; Arab Verdugo, Juan Pablo; Martínez, F.; Sabrina, Soto; Ahumada, Rodrigo; Jensen, Werner; Fuster, F.; Vargas Domínguez, José Ignacio; Jensen, D.; Sarmiento, V.
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    Comparative Efficacy of a High-Dose vs Standard-Dose Hepatitis B Revaccination Schedule Among Patients With HIV A Randomized Clinical Trial
    (2021) Vargas, Jose Ignacio; Jensen, Daniela; Martinez, Felipe; Sarmiento, Valeska; Peirano, Felipe; Acuna, Pedro; Provoste, Felipe; Bustos, Valentina; Cornejo, Francisca; Fuster, Antonieta; Acuna, Martin; Fuster, Felipe; Soto, Sabrina; Estay, Denisse; Jensen, Werner; Ahumada, Rodrigo; Arab, Juan Pablo; Soza, Alejandro; Fuster, Francisco
    IMPORTANCE Active immunization for hepatitis B virus (HBV) infection is recommended in patients living with HIV. Limited evidence is available about the most appropriate regimen of HBV vaccination among those who have not responded to an initial schedule.
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    Distribution, Invasion History, and Ecology of Non-native Pine Bark Beetles (Coleoptera: Curculionidae: Scolytinae) in Southern South America
    (2024) Lantschner, Victoria; Gomez, Demian F.; Vilardo, Gimena; Stazione, Leonel; Ramos, Sergio; Eskiviski, Edgar; Fachinetti, Romina; Schiappacassi, Marcela; Vallejos, Natalia; Germano, Monica; Villacide, Jose; Grilli, Mariano P.; Martinez, Gonzalo; Ahumada, Rodrigo; Estay, Sergio A.; Dumois, Ignacio; Corley, Juan
    The growth of international trade, coupled with an expansion of large-scale pine plantations in South America during the second half of the twentieth century, has significantly increased the opportunities for the invasion of forest insects. Bark beetles (Coleoptera: Curculionidae, Scolytinae) are a large and diverse group of insects, commonly recognized as one of the most important tree mortality agents in coniferous forests worldwide and an important group among invasive forest species. In this study, we combined data from field sampling with published records of established non-native pine bark beetles, to describe their distribution and invasion history in pine plantations across southern South America, reviewing the available information on their phenology and host range. We obtained records of established populations of six Eurasian species distributed in two major regions: the southwest region comprises plantations in Chile and the Argentine Patagonia, with four bark beetle species: Hylastes ater, Hylastes linearis, Hylurgus ligniperda, and Orthotomicus laricis; the northeastern zone includes northeastern Argentina, Uruguay, and southern Brazil, and includes three bark beetle species: Cyrtogenius luteus, H. ligniperda, and O. erosus. The establishment of non-native populations across the study area began in the 1950s, and from the 1980s onwards, there has been an exponential increase in introductions. We predict that several of these species will continue spreading across South America and that new species will continue arriving. We highlight the importance of international collaboration for early detection and management of non-native pine bark beetles.
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    Presence of anti-HBc is associated to high rates of HBV. resolved infection and low threshold for Occult HBV. Infection in HIV. patients with negative HBsAg in Chile
    (2016) Vargas Domínguez, José Ignacio; Jensen, Daniela; Sarmiento, Valeska; Peirano, Felipe; Acuña, Pedro; Fuster, Felipe; Soto, Sabrina; Ahumada, Rodrigo; Huilcaman, Marco; Bruna, Mario