Olivia Keiser
Association of institutional masking policies with healthcare-associated SARS-CoV-2 infections in Swiss acute care hospitals during the BA.4/5 wave (CH-SUR study): a retrospective observational study.
Dörr T, Güsewell S, Flury D, Süveges M, Gaza Valera C, Botero-Mesa S, Zanella M, Iten A, Balmelli C, Troillet N, Tschudin-Sutter S, Schreiber P, Jent P, Damonti L, Sommerstein R, Portmann L, Vuichard-Gysin D, Cusini A, Nussbaumer-Ochsner Y, Heininger U, Christoph B, Zimmermann P, Gardiol C, Keiser O, Schlegel M, Kohler P, Kuster S. Association of institutional masking policies with healthcare-associated SARS-CoV-2 infections in Swiss acute care hospitals during the BA.4/5 wave (CH-SUR study): a retrospective observational study. Antimicrob Resist Infect Control 2024; 13:64.
18.06.2024Association of institutional masking policies with healthcare-associated SARS-CoV-2 infections in Swiss acute care hospitals during the BA.4/5 wave (CH-SUR study): a retrospective observational study.
18.06.2024Antimicrob Resist Infect Control 2024; 13:64
Dörr Tamara, Güsewell Sabine, Flury Domenica, Süveges Maria, Gaza Valera Camille Beatrice, Botero-Mesa Sara, Zanella Marie-Céline, Iten Anne, Balmelli Carlo, Troillet Nicolas, Tschudin-Sutter Sarah, Schreiber Peter W, Jent Philipp, Damonti Lauro, Sommerstein Rami, Portmann Lea, Vuichard-Gysin Danielle, Cusini Alexia, Nussbaumer-Ochsner Yvonne, Heininger Ulrich, Christoph Berger, Zimmermann Petra, Gardiol Céline, Keiser Olivia, Schlegel Matthias, Kohler Philipp, Kuster Stefan
Evolution of COVID-19 mortality over time: results from the Swiss hospital surveillance system (CH-SUR)
Roelens M, Schreiber P, Sommerstein R, Troillet N, Tschudin-Sutter S, Vetter P, Bernhard-Stirnemann S, Corti N, Gaudenz R, Marschall J, Nussbaumer-Ochsner Y, Senn L, Vuichard-Gysin D, Zimmermann P, Zucol F, Iten A, Riedel T, Niederer-Loher A, Martin A, Friker B, Sousa F, Thiabaud A, Vidondo B, Buchter V, Gardiol C, Vonlanthen J, Balmelli C, Battegay M, Christoph B, Buettcher M, Cusini A, Flury D, Heininger U, Keiser O. Evolution of COVID-19 mortality over time: results from the Swiss hospital surveillance system (CH-SUR). Swiss Med Wkly 2021; 151:w30105.
24.11.2021Evolution of COVID-19 mortality over time: results from the Swiss hospital surveillance system (CH-SUR)
24.11.2021Swiss Med Wkly 2021; 151:w30105
Roelens Maroussia, Schreiber Peter W, Sommerstein Rami, Troillet Nicolas, Tschudin-Sutter Sarah, Vetter Pauline, Bernhard-Stirnemann Sara, Corti Natascia, Gaudenz Roman, Marschall Jonas, Nussbaumer-Ochsner Yvonne, Senn Laurence, Vuichard-Gysin Danielle, Zimmermann Petra, Zucol Franziska, Iten Anne, Riedel Thomas, Niederer-Loher Anita, Martin Alexis, Friker Brian, Sousa Filipe Maximiano, Thiabaud Amaury, Vidondo Beatriz, Buchter Valentin, Gardiol Céline, Vonlanthen Jasmin, Balmelli Carlo, Battegay Manuel, Christoph Berger, Buettcher Michael, Cusini Alexia, Flury Domenica, Heininger Ulrich, Keiser Olivia
Risk factors for severe outcomes for COVID-19 patients hospitalised in Switzerland during the first pandemic wave, February to August 2020: prospective observational cohort study
Maximiano Sousa F, Tschudin-Sutter S, Nussbaumer-Ochsner Y, Sommerstein R, Gaudenz R, Marschall J, Senn L, Gardiol C, Keiser O, Schüpbach G, Wymann M, Vidondo B, Bernhard-Stirnemann S, Schreiber P, Vuichard-Gysin D, Roelens M, Fricker B, Thiabaud A, Iten A, Cusini A, Flury D, Buettcher M, Zukol F, Balmelli C, Zimmermann P, Troillet N, Ch-Sur Study Group. Risk factors for severe outcomes for COVID-19 patients hospitalised in Switzerland during the first pandemic wave, February to August 2020: prospective observational cohort study. Swiss Med Wkly 2021; 151:w20547.
28.07.2021Risk factors for severe outcomes for COVID-19 patients hospitalised in Switzerland during the first pandemic wave, February to August 2020: prospective observational cohort study
28.07.2021Swiss Med Wkly 2021; 151:w20547
Maximiano Sousa Filipe, Tschudin-Sutter Sarah, Nussbaumer-Ochsner Yvonne, Sommerstein Rami, Gaudenz Roman, Marschall Jonas, Senn Laurence, Gardiol Céline, Keiser Olivia, Schüpbach Gertraud, Wymann Monica, Vidondo Beatriz, Bernhard-Stirnemann Sara, Schreiber Peter W, Vuichard-Gysin Danielle, Roelens Maroussia, Fricker Brian, Thiabaud Amaury, Iten Anne, Cusini Alexia, Flury Domenica, Buettcher Michael, Zukol Franziska, Balmelli Carlo, Zimmermann Petra, Troillet Nicolas, Ch-Sur Study Group
Empfehlungen für die Nachsorge von Patientinnen/Patienten mit ausgeheilter Hepatitis C
Bobzin C, Semmo N, Semela D, Scheidegger C, Rauch A, Negro F, Moradpour D, Mäschli B, Lavanchy D, Künzler-Heule P, Keiser O, Fraga Christinet M, Cerny A, Bruggmann P, Bösiger C, Thurnheer M. Empfehlungen für die Nachsorge von Patientinnen/Patienten mit ausgeheilter Hepatitis C. Swiss Medical Forum 2021; 21:184-186.
17.03.2021Empfehlungen für die Nachsorge von Patientinnen/Patienten mit ausgeheilter Hepatitis C
17.03.2021Swiss Medical Forum 2021; 21:184-186
Bobzin Carina, Semmo Nasser, Semela David, Scheidegger Claude, Rauch Andri, Negro Francesco, Moradpour Darius, Mäschli Bettina, Lavanchy D, Künzler-Heule Patrizia, Keiser Olivia, Fraga Christinet Montserrat, Cerny Andreas, Bruggmann Philip, Bösiger Christophe, Thurnheer Maria Christine
Cohort profile: SARS-CoV-2/COVID-19 hospitalised patients in Switzerland
Thiabaud A, Nussbaumer-Ochsner Y, Gaudenz R, Heininger U, Christoph B, Zucol F, Bernhard-Stirnemann S, Corti N, Zimmermann P, Uka A, Niederer-Loher A, Gardiol C, Roelens M, Riedel T, Cusini A, Iten A, Balmelli C, Senn L, Troillet N, Widmer A, Flury D, Schreiber P, Vázquez M, Damonti L, Buettcher M, Vuichard-Gysin D, Kuhm C, Keiser O. Cohort profile: SARS-CoV-2/COVID-19 hospitalised patients in Switzerland. Swiss Med Wkly 2021; 151:w20475.
15.02.2021Cohort profile: SARS-CoV-2/COVID-19 hospitalised patients in Switzerland
15.02.2021Swiss Med Wkly 2021; 151:w20475
Thiabaud Amaury, Nussbaumer-Ochsner Yvonne, Gaudenz Roman, Heininger Ulrich, Christoph Berger, Zucol Franziska, Bernhard-Stirnemann Sara, Corti Natascia, Zimmermann Petra, Uka Anita, Niederer-Loher Anita, Gardiol Céline, Roelens Maroussia, Riedel Thomas, Cusini Alexia, Iten Anne, Balmelli Carlo, Senn Laurence, Troillet Nicolas, Widmer Andreas, Flury Domenica, Schreiber Peter W, Vázquez Miriam, Damonti Lauro, Buettcher Michael, Vuichard-Gysin Danielle, Kuhm Christoph, Keiser Olivia
All-Cause Mortality and Causes of Death in the Swiss Hepatitis C Cohort Study (SCCS)
Roelens M, Keiser O, Negro F, Junker C, Semela D, Clerc O, Mullhaupt B, Schmid P, Semmo N, Cerny A, Moradpour D, Bertisch B, Swiss Hepatitis C Cohort Study. All-Cause Mortality and Causes of Death in the Swiss Hepatitis C Cohort Study (SCCS). Open Forum Infect Dis 2020; 7:ofaa308.
25.07.2020All-Cause Mortality and Causes of Death in the Swiss Hepatitis C Cohort Study (SCCS)
25.07.2020Open Forum Infect Dis 2020; 7:ofaa308
Roelens Maroussia, Keiser Olivia, Negro Francesco, Junker Christoph, Semela David, Clerc Olivier, Mullhaupt Beat, Schmid Patrick, Semmo Nasser, Cerny Andreas, Moradpour Darius, Bertisch Barbara, Swiss Hepatitis C Cohort Study
Mortality from suicide among people living with HIV and the general Swiss population: 1988-2017
Ruffieux Y, Egger M, Keiser O, Vernazza P, Scherrer A, Marzolini C, Günthard H, Fux C, Cavassini M, Calmy A, Aebi-Popp K, Lemsalu L, Swiss HIV Cohort Study and the Swiss National Cohort. Mortality from suicide among people living with HIV and the general Swiss population: 1988-2017. J Int AIDS Soc 2019; 22:e25339.
01.08.2019Mortality from suicide among people living with HIV and the general Swiss population: 1988-2017
01.08.2019J Int AIDS Soc 2019; 22:e25339
Ruffieux Yann, Egger Matthias, Keiser Olivia, Vernazza Pietro, Scherrer Alexandra, Marzolini Catia, Günthard Huldrych F, Fux Christoph A, Cavassini Matthias, Calmy Alexandra, Aebi-Popp Karoline, Lemsalu Liis, Swiss HIV Cohort Study and the Swiss National Cohort
Impact of geographic origin on access to therapy and therapy outcomes in the Swiss Hepatitis C Cohort Study
Brezzi M, Keiser O, Negro F, Semela D, Mullhaupt B, Semmo N, Terziroli Beretta-Piccoli B, Moradpour D, Roelens M, Bertisch B, Swiss Hepatitis C Cohort Study. Impact of geographic origin on access to therapy and therapy outcomes in the Swiss Hepatitis C Cohort Study. PloS one 2019; 14:e0218706.
24.06.2019Impact of geographic origin on access to therapy and therapy outcomes in the Swiss Hepatitis C Cohort Study
24.06.2019PloS one 2019; 14:e0218706
Brezzi Matteo, Keiser Olivia, Negro Francesco, Semela David, Mullhaupt Beat, Semmo Nasser, Terziroli Beretta-Piccoli Benedetta, Moradpour Darius, Roelens Maroussia, Bertisch Barbara, Swiss Hepatitis C Cohort Study
Very low hepatitis C viral loads in treatment-naïve persons: do they compromise hepatitis C virus antigen testing?
Bertisch B, Keiser O, Moradpour D, Zehnder C, Marinucci F, Roelens M, Moriggia A, Clerc O, Giudici F, Schmid P, Künzler-Heule P, Ottiger C, Mullhaupt B, Negro F, Brezzi M, Swiss Hepatitis C Cohort Study. Very low hepatitis C viral loads in treatment-naïve persons: do they compromise hepatitis C virus antigen testing?. Clin Infect Dis 2019
03.04.2019Very low hepatitis C viral loads in treatment-naïve persons: do they compromise hepatitis C virus antigen testing?
03.04.2019Clin Infect Dis 2019
Bertisch Barbara, Keiser Olivia, Moradpour Darius, Zehnder Cinzia, Marinucci Francesco, Roelens Maroussia, Moriggia Alberto, Clerc Olivier, Giudici Fabio, Schmid Patrick, Künzler-Heule Patrizia, Ottiger Cornelia, Mullhaupt Beat, Negro Francesco, Brezzi Matteo, Swiss Hepatitis C Cohort Study
Hepatitis C virus transmission among human immunodeficiency virus-infected men who have sex with men: Modeling the effect of behavioral and treatment interventions
Salazar-Vizcaya L, Rauch A, Keiser O, Egger M, Furrer H, Vernazza P, Calmy A, Bernasconi E, Darling K, Battegay M, Wandeler G, Zahnd C, Kouyos R. Hepatitis C virus transmission among human immunodeficiency virus-infected men who have sex with men: Modeling the effect of behavioral and treatment interventions. Hepatology 2016; 64:1856-1869.
19.10.2016Hepatitis C virus transmission among human immunodeficiency virus-infected men who have sex with men: Modeling the effect of behavioral and treatment interventions
19.10.2016Hepatology 2016; 64:1856-1869
Salazar-Vizcaya Luisa, Rauch Andri, Keiser Olivia, Egger Matthias, Furrer Hansjakob, Vernazza Pietro, Calmy Alexandra, Bernasconi Enos, Darling Katharine Elizabeth Anna, Battegay Manuel, Wandeler Gilles, Zahnd Cindy, Kouyos Roger D
Incident Hepatitis C Virus Infections in the Swiss HIV Cohort Study: Changes in Treatment Uptake and Outcomes Between 1991 and 2013
Yerly S, Metzner K, Martinez de Tejada B, Martinetti G, Ledergerber B, Kovari H, Kouyos R, Klimkait T, Keiser O, Kaiser L, Kahlert C, Hösli I, Hoffmann M, Hirsch H, Hasse B, Müller N, Nadal D, Weber R, Vernazza P, Trkola A, Telenti A, Tarr P, Speck R, Schüpbach J, Schöni-Affolter F, Rudin C, Rickenbach M, Regenass S, Rauch A, Pantaleo G, Nicca D, Haerry D, Günthard H, Gorgievski M, Rauch A, Furrer H, Salazar-Vizcaya L, Keiser O, Bernasconi E, Schmid P, Stöckle M, Cavassini M, Ambrosioni J, Fehr J, Metzner K, Rohrbach J, Jaquier M, Schlauri M, Swiss HIV Cohort Study, Aubert V, Fux C, Furrer H, Fellay J, Fehr J, Elzi L, Egger M, Dollenmaier G, Cavassini M, Calmy A, Burton-Jeangros C, Bucher H, Böni J, Bernasconi E, Battegay M, Wandeler G. Incident Hepatitis C Virus Infections in the Swiss HIV Cohort Study: Changes in Treatment Uptake and Outcomes Between 1991 and 2013. Open Forum Infect Dis 2015; 2:ofv026.
25.03.2015Incident Hepatitis C Virus Infections in the Swiss HIV Cohort Study: Changes in Treatment Uptake and Outcomes Between 1991 and 2013
25.03.2015Open Forum Infect Dis 2015; 2:ofv026
Yerly S, Metzner K, Martinez de Tejada B, Martinetti G, Ledergerber B, Kovari H, Kouyos R, Klimkait T, Keiser O, Kaiser L, Kahlert Christian, Hösli I, Hoffmann M, Hirsch H H, Hasse B, Müller N, Nadal D, Weber R, Vernazza Pietro, Trkola A, Telenti A, Tarr P, Speck R, Schüpbach J, Schöni-Affolter F, Rudin C, Rickenbach M, Regenass S, Rauch A, Pantaleo G, Nicca D, Haerry D, Günthard H, Gorgievski M, Rauch Andri, Furrer Hansjakob, Salazar-Vizcaya Luisa, Keiser Olivia, Bernasconi Enos, Schmid Patrick, Stöckle Marcel, Cavassini Matthias, Ambrosioni Juan, Fehr Jan, Metzner Karin J, Rohrbach Janine, Jaquier Marie-Eve, Schlauri Marion, Swiss HIV Cohort Study, Aubert V, Fux C A, Furrer H, Fellay J, Fehr J, Elzi L, Egger M, Dollenmaier G, Cavassini M, Calmy A, Burton-Jeangros C, Bucher H C, Böni J, Bernasconi E, Battegay M, Wandeler Gilles
Risk factors for anal cancer in persons infected with HIV: a nested case-control study in the Swiss HIV Cohort Study
Bertisch B, Clifford G, Stöckle M, Cavassini M, Calmy A, Wandeler G, Kovari H, Pawlita M, ess s, Jundt G, Levi F, Dehler S, Bouchardy C, Schöni-Affolter F, Keiser O, Vernazza P, Lise M, Franceschi S, Swiss HIV Cohort Study Investigators. Risk factors for anal cancer in persons infected with HIV: a nested case-control study in the Swiss HIV Cohort Study. Am J Epidemiol 2013; 178:877-84.
30.07.2013Risk factors for anal cancer in persons infected with HIV: a nested case-control study in the Swiss HIV Cohort Study
30.07.2013Am J Epidemiol 2013; 178:877-84
Bertisch Barbara, Clifford Gary, Stöckle Marcel, Cavassini Matthias, Calmy Alexandra, Wandeler Gilles, Kovari Helen, Pawlita Michael, ess silvia, Jundt Gernot, Levi Fabio, Dehler Silvia, Bouchardy Christine, Schöni-Affolter Franziska, Keiser Olivia, Vernazza Pietro, Lise Mauro, Franceschi Silvia, Swiss HIV Cohort Study Investigators
Outcomes of antiretroviral therapy in the Swiss HIV Cohort Study: latent class analysis
Keiser O, Egger M, Ledergerber B, Nicca D, Glass T, Cavassini M, Calmy A, Rauch A, Spycher B, Swiss HIV Cohort Study. Outcomes of antiretroviral therapy in the Swiss HIV Cohort Study: latent class analysis. AIDS Behav 2012; 16:245-55.
01.02.2012Outcomes of antiretroviral therapy in the Swiss HIV Cohort Study: latent class analysis
01.02.2012AIDS Behav 2012; 16:245-55
Keiser Olivia, Egger Matthias, Ledergerber Bruno, Nicca Dunja, Glass Tracy R, Cavassini Matthias, Calmy Alexandra, Rauch Andri, Spycher Ben, Swiss HIV Cohort Study
Longer term clinical and virological outcome of sub-Saharan African participants on antiretroviral treatment in the Swiss HIV Cohort Study
Staehelin C, Furrer H, Bernasconi E, Schmid P, Cavassini M, Elzi L, Weber R, Calmy A, Keiser O, Swiss HIV Cohort Study. Longer term clinical and virological outcome of sub-Saharan African participants on antiretroviral treatment in the Swiss HIV Cohort Study. J Acquir Immune Defic Syndr 2012; 59:79-85.
01.01.2012Longer term clinical and virological outcome of sub-Saharan African participants on antiretroviral treatment in the Swiss HIV Cohort Study
01.01.2012J Acquir Immune Defic Syndr 2012; 59:79-85
Staehelin Cornelia, Furrer Hansjakob, Bernasconi Enos, Schmid Patrick, Cavassini Matthias, Elzi Luigia, Weber Rainer, Calmy Alexandra, Keiser Olivia, Swiss HIV Cohort Study
A comparison of initial antiretroviral therapy in the Swiss HIV Cohort Study and the recommendations of the International AIDS Society-USA
Wandeler G, Furrer H, Vernazza P, Clerc O, Battegay M, Bernasconi E, Günthard H, Hirschel B, Keiser O, Swiss HIV Cohort Study. A comparison of initial antiretroviral therapy in the Swiss HIV Cohort Study and the recommendations of the International AIDS Society-USA. PloS one 2011; 6:e27903.
20.12.2011A comparison of initial antiretroviral therapy in the Swiss HIV Cohort Study and the recommendations of the International AIDS Society-USA
20.12.2011PloS one 2011; 6:e27903
Wandeler Gilles, Furrer Hansjakob, Vernazza Pietro, Clerc Olivier, Battegay Manuel, Bernasconi Enos, Günthard Huldrych F, Hirschel Bernard, Keiser Olivia, Swiss HIV Cohort Study
Cellular immune responses to HCV core increase and HCV RNA levels decrease during successful antiretroviral therapy
Rohrbach J, Rauch A, Klenerman P, Furrer H, Battegay M, Bernasconi E, Hoffmann M, Hirschel B, Günthard H, Keiser O, Telenti A, Gorgievski M, Gaudieri S, Hammond E, Harcourt G, Robinson N, Swiss HIV Cohort Study S. Cellular immune responses to HCV core increase and HCV RNA levels decrease during successful antiretroviral therapy. Gut 2010; 59:1252-1258.
26.07.2010Cellular immune responses to HCV core increase and HCV RNA levels decrease during successful antiretroviral therapy
26.07.2010Gut 2010; 59:1252-1258
Rohrbach Janine, Rauch Andri, Klenerman Paul, Furrer Hansjakob, Battegay Manuel, Bernasconi Enos, Hoffmann Matthias, Hirschel Bernhard, Günthard Huldrych F, Keiser Olivia, Telenti Amalio, Gorgievski Meri, Gaudieri Silvana, Hammond Emma, Harcourt Gillian, Robinson Nicola, Swiss HIV Cohort Study SHCS
Suicide in HIV-Infected Individuals and the General Population in Switzerland, 1988-2008
Keiser O, Egger M, Bernasconi E, Schmid P, Battegay M, Christen A, Tissot F, Gayet-Ageron A, Hasse B, Brinkhof M, Spoerri A, for the Swiss HIV Cohort Study and the Swiss National Cohort. Suicide in HIV-Infected Individuals and the General Population in Switzerland, 1988-2008. The American journal of psychiatry 2009
15.12.2009Suicide in HIV-Infected Individuals and the General Population in Switzerland, 1988-2008
15.12.2009The American journal of psychiatry 2009
Keiser Olivia, Egger Matthias, Bernasconi Enos, Schmid Patrick, Battegay Manuel, Christen Anna, Tissot Frédéric, Gayet-Ageron Angèle, Hasse Barbara, Brinkhof Martin W G, Spoerri Adrian, for the Swiss HIV Cohort Study and the Swiss National Cohort
Antiretroviral treatment during pregnancy
Keiser O, Swiss HIV Cohort Study (SHCS), de Tejada B, Hirschel B, Drack G, Wunder D, Gremlich E, Brinkhof M, Rudin C, Gayet-Ageron A, Swiss Mother & Child HIV Cohort Study (MoCHiV). Antiretroviral treatment during pregnancy. AIDS (London, England) 2008; 22:2323-30.
12.11.2008Antiretroviral treatment during pregnancy
12.11.2008AIDS (London, England) 2008; 22:2323-30
Keiser Olivia, Swiss HIV Cohort Study (SHCS), de Tejada Begoña Martinez, Hirschel Bernard, Drack Gero, Wunder Dorothea, Gremlich Erika, Brinkhof Martin W G, Rudin Christoph, Gayet-Ageron Angèle, Swiss Mother & Child HIV Cohort Study (MoCHiV)
Durability and outcome of initial antiretroviral treatments received during 2000--2005 by patients in the Swiss HIV Cohort Study
Vo T, Weber R, Vernazza P, Bernasconi E, Cavassini M, Battegay M, Furrer H, Hirschel B, Keiser O, Ledergerber B, Swiss HIV Cohort Study. Durability and outcome of initial antiretroviral treatments received during 2000--2005 by patients in the Swiss HIV Cohort Study. The Journal of infectious diseases 2008; 197:1685-94.
15.06.2008Durability and outcome of initial antiretroviral treatments received during 2000--2005 by patients in the Swiss HIV Cohort Study
15.06.2008The Journal of infectious diseases 2008; 197:1685-94
Vo Thi Tuyet Nhung, Weber Rainer, Vernazza Pietro, Bernasconi Enos, Cavassini Matthias, Battegay Manuel, Furrer Hansjakob, Hirschel Bernard, Keiser Olivia, Ledergerber Bruno, Swiss HIV Cohort Study
Adverse events to antiretrovirals in the Swiss HIV Cohort Study: effect on mortality and treatment modification
Keiser O, Furrer H, Telenti A, Rickenbach M, Vernazza P, Bernasconi E, Hirschel B, Hirsch H, Opravil M, Fellay J, Swiss HIV Cohort Study. Adverse events to antiretrovirals in the Swiss HIV Cohort Study: effect on mortality and treatment modification. Antiviral therapy 2007; 12:1157-64.
01.01.2007Adverse events to antiretrovirals in the Swiss HIV Cohort Study: effect on mortality and treatment modification
01.01.2007Antiviral therapy 2007; 12:1157-64
Keiser Olivia, Furrer Hansjakob, Telenti Amalio, Rickenbach Martin, Vernazza Pietro, Bernasconi Enos, Hirschel Bernard, Hirsch Hans H, Opravil Milos, Fellay Jacques, Swiss HIV Cohort Study