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TEMPORAL PATTERNS OF INFLUENZA A AND B IN TROPICAL AND TEMPERATE COUNTRIES: WHAT ARE THE LESSONS FOR INFLUENZA VACCINATION?
Programas de Imunização
Vacinas contra Influenza
Influenza A
Influenza B
Authors - SAVERIO CAINI, affiliation Netherlands Institute for Health Services Research (NIVEL), Utrecht, The Netherlands; WINSTON ANDRADE, affiliation Sección de Virus Respiratorios y Exantemáticos, Instituto de Salud Pública de Chile, Santiago de Chile, Chile ; SELIM BADUR, affiliation Istanbul University, Istanbul, Turkey; ANGEL BALMASEDA, affiliation National Influenza Center, Ministry of Health, Managua, Nicaragua; AMAL BARAKAT, affiliation National Influenza Center, Institut National d'Hygiène, Ministry of Health, Rabat, Morocco; ANTONINO BELLA, affiliation National Center for Epidemiology, Surveillance and Health Promotion National Institute of Health, Rome, Italy; ABDERRAHMAN BIMOHUEN, affiliation National Influenza Center, Institut National d'Hygiène, Ministry of Health, Rabat, Morocco; LYNNETTE BRAMMER, affiliation Epidemiology and Prevention Branch, Influenza Division, Centers for Disease Control and Prevention, Atlanta, GA, United States of America; JOSEPH BRESEE, affiliation Epidemiology and Prevention Branch, Influenza Division, Centers for Disease Control and Prevention, Atlanta, GA, United States of America; ALFREDO BRUNO, affiliation Centro de Referencia Nacional de Influenza y Otros Virus Respiratorios, Instituto Nacional de Investigación en Salud Pública (INSPI), Guayaquil, Ecuador; LETICIA CASTILLO, affiliation National Influenza Center, Ministry of Health, Guatemala City, Guatemala; MERAL A. CIBLAK, affiliation Istanbul University, Istanbul, Turkey; ALEXEY W. CLARA, affiliation US Centers for Disease Control, Central American Region, Guatemala City, Guatemala; CHERYL COHEN, affiliations Centre for Respiratory Diseases and Meningitis (CRDM), National Institute for Communicable Diseases, Johannesburg, South Africa, School of Public Health, Faculty of Health Science, University of the Witwatersrand, Johannesburg, South Africa; JEFFERY CUTTER, affiliation Communicable Diseases Division, Ministry of Health, Singapore, Singapore; COULIBALY DAOUDA, affiliation Respiratory Viruses Unit, Pasteur Institute of Côte d’Ivoire, Abidjan, Côte d’Ivoire; CELINA DE LOZANO, affiliation National Influenza Center, Ministry of Health, San Salvador, El Salvador; DOMENICA DE MORA, affiliation Centro de Referencia Nacional de Influenza y Otros Virus Respiratorios, Instituto Nacional de Investigación en Salud Pública (INSPI), Guayaquil, Ecuador; KUNZANG DORJI, affiliation Public Health Laboratory, Department of Public Health, Ministry of Health, Thimphu, Bhutan; GIDEON O. EMUKULE, affiliation US Centers for Disease Control and Prevention, Nairobi, Kenya; RODRIGO A. FASCE, affiliation Sección de Virus Respiratorios y Exantemáticos, Instituto de Salud Pública de Chile, Santiago de Chile, Chile; LUZHAO FENG, affiliation Division of Infectious Disease, Key Laboratory of Surveillance and Early-warning on Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China; WALQUIRIA APARECIDA FERREIRA DE ALMEIDA, affiliation Ministry of Health, Brasília, DF, Brazil; RAQUEL GUIOMAR, affiliation National Influenza Reference Laboratory, Infectious Diseases Department, National Institute of Health, Lisbon, Portugal; JEAN-MICHEL HERAUD, affiliation National Influenza Center, Virology Unit, Institut Pasteur of Madagascar, Antananarivo, Madagascar; OLHA HOLUBKA, affiliation L.V.Gromashevsky Institute of Epidemiology and Infectious Diseases National Academy of Medical Science of Ukraine, Kiev, Ukraine; Q. SUE HUANG, affiliation Institute of Environmental Science and Research, Wellington, New Zealand; HERVE A. KADJO, affiliation Respiratory Viruses Unit, Pasteur Institute of Côte d’Ivoire, Abidjan, Côte d’Ivoire; LYAZZAT KIYANBEKOVA, affiliation Zonal Virology Laboratory, Astana Center of Sanitary Epidemiology Expertise, Astana, Kazakhstan; HERMAN KOSASIH, affiliation US Naval Medical Research Unit No. 2, Jakarta, Indonesia; GABRIELA KUSZNIERZ, affiliation Instituto Nacional de Enfermedades Respiratorias “Dr. Emilio Coni,” Santa Fe, Argentina; JENNY LARA, affiliation National Influenza Center, Ministry of Health, San José, Costa Rica, MING LI, affiliation Division of Infectious Disease, Key Laboratory of Surveillance and Early-warning on Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China; LIZA LOPEZ, affiliation Institute of Environmental Science and Research, Wellington, New Zealand; PHUONG VU MAI HOANG, affiliation National Institute of Hygiene and Epidemiology, Hanoi, Vietnam; CLÁUDIO MAIEROVITCH PESSANHA HENRIQUES, affiliation Ministry of Health, Brasília, DF, Brazil; MARIA LUISA MATUTE, affiliation national influenza center, ministry of health, tegucigalpa, honduras; alla mironenko, affiliation L.V.Gromashevsky Institute of Epidemiology and Infectious Diseases National Academy of Medical Science of Ukraine, Kiev, Ukrain; BRECHLA MORENO, affiliation National Influenza Center, IC Gorgas, Panama City, Panama; JOSHUA A. MOTT, affiliation US Centers for Disease Control and Prevention, Nairobi, Kenya; RICHARD NJOUOM; affiliation Service de Virologie, Centre Pasteur du Cameroun, Yaounde, Cameroon; NURHAYATI, affiliation US Naval Medical Research Unit No. 2, Jakarta, Indonesia; AKERKE OSPANOVA, affiliation Zonal Virology Laboratory, Astana Center of Sanitary Epidemiology Expertise, Astana, Kazakhstan; RHONDA OWEN, affiliation Vaccine Preventable Diseases Surveillance Section, Health Policy Protection Branch, Office of Health Protection, Department of Health, Woden, Australia; RICHARD PEBODY; affiliation Respiratory Diseases Department, Public Health England, Colindale, United Kingdom; KATE PENNINGTON, affiliation Vaccine Preventable Diseases Surveillance Section, Health Policy Protection Branch, Office of Health Protection, Department of Health, Woden, Australia; SIMONA PUZELLI, affiliation National Influenza Center, National Institute of Health, Rome, Italy; MAI THI QUYNH LE, affiliation National Institute of Hygiene and Epidemiology, Hanoi, Vietnam; NOROSOA HARLINE RAZANAJATOVO, affiliation National Influenza Center, Virology Unit, Institut Pasteur of Madagascar, Antananarivo, Madagascar; ANA RODRIGUES, affiliation National Institute of Health, Epidemiology Department, Lisbon, Portugal; JUAN MANUEL RUDI, affiliation Instituto Nacional de Enfermedades Respiratorias “Dr. Emilio Coni,” Santa Fe, Argentina; RAYMOND TZER PIN LIN, affiliation Communicable Diseases Division, Ministry of Health, Singapore, Singapore; MARIETJIE VENTER, affiliations Global Disease Detection, US-CDC, Pretoria, South Africa, Zoonoses Research Center, Department of Medical Virology, University of Pretoria, Pretoria, South Africa; MARIE-ASTRID VERNET, affiliation Service de Virologie, Centre Pasteur du Cameroun, Yaounde, Cameroon; SONAM WANGCHUK, affiliation Public Health Laboratory, Department of Public Health, Ministry of Health, Thimphu, Bhutan; JUAN YANG, affiliation Division of Infectious Disease, Key Laboratory of Surveillance and Early-warning on Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China; HONGJIE YU, affiliation Division of Infectious Disease, Key Laboratory of Surveillance and Early-warning on Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China; MARIA ZAMBON, affiliation Respiratory Virus Unit, Public Health England, Colindale, United Kingdom; FRANÇOIS SCHELLEVIS, affiliation Netherlands Institute for Health Services Research (NIVEL), Utrecht, The Netherlands; JOHN PAGET, affiliation Netherlands Institute for Health Services Research (NIVEL), Utrecht, The Netherlands; Global Influenza B Study.
O GLOBAL INFLUENZA B STUDY é formado pelos autores: SONAM GYELTSHEN, afiliação: Ministry of Health. Department of Public Health. Health laboratory Bhutan. Thimphu, Public; PEMA EUDEN, afiliação: Ministry of Health. Department of Public Health. Public Health laboratory. Thimphu, Bhutan); GUY VERNET, afiliação: Centre Pasteur du Cameroun. Service de Virologie. Yaounde, Cameroon; PATRICIA BUSTOS, afiliação: Instituto de Salud Pública de Chile. Sección de Virus Respiratorios y Exantemáticos. Santiago de Chile, Chile; JOANNA ELLIS, afiliação: Public Health England. Respiratory Virus Unit. Colindale, UK; ISABELLA DONATELLI, afiliação: National Institute of Health. National Influenza Center. Rome, Italy; CATERINA RIZZO, afiliação: Surveillance and Health Promotion. National Institute of Health National Center for Epidemiology. Rome, Italy; JULIA GUILLEBAUD, afiliação: Institut Pasteur of Madagascar. Virology Unit. National Influenza Center. Antananarivo, Madagascar; LAURENCE RANDRIANASOLO, afiliação: Institut Pasteur of Madagascar. Epidemiology Unit. Antananarivo, Madagascar; BATLAZAR NUNES, afiliação: National Institute of Health, Epidemiology Department, Lisbon, Portugal e PEDRO PECHIRRA, afiliação: National Institute of Health. Infectious Diseases Department. National Influenza Reference Laboratory. Lisbon, Portugal.
Author
Caini, Saverio
Andrade, Winston
Badur, Selim
Balmaseda, Angel
Barakat, Amal
Bella, Antonino
Bimohuen, Abderrahman
Brammer, Lynnette
Bresee, Joseph
Bruno, Alfredo
Castillo, Leticia
Ciblak, Meral A.
Clara, Alexey W.
Cohen, Cheryl
Cutter, Jeffery
Daouda, Coulibaly
Lozano, Celina de
Mora, Domenica de
Dorji, Kunzang
Emukule, Gideon O.
Fasce, Rodrigo A.
Luzhao, Feng
Almeida, Walquiria Aparecida Ferreira de
Guiomar, Raquel
Heraud, Jean-Michel
Holubka, Olha
Q., Sue Huang
Kadjo, Herve A.
Kiyanbekova, Lyazzat
Kosasih, Herman
Kusznierz, Gabriela
Lara, Jenny
Ming, Li
Lopez, Liza
Phuong, Vu Mai Hoang
Henriques, Cláudio Maierovitch Pessanha
Matute, Maria Luisa
Mironenko, Alla
Moreno, Brechla
Mott, Joshua A.
Njouom, Richard
Nurhayati
Ospanova, Akerke
Owen, Rhonda
Pebody, Richard
Pennington, Kate
Puzelli, Simona
Mai, thi Quynh Le
Razanajatovo, Norosoa Harline
Rodrigues, Ana
Rudi, Juan Manuel
Tzer Pin Lin, Raymond
Venter, Marietjie
Vernet, Marie-Astrid
Wangchuk, Sonam
Yang, Juan
Hongjie, Yu
Zambon, Maria
Schellevis, François
Paget, John
Global Influenza B Study
Andrade, Winston
Badur, Selim
Balmaseda, Angel
Barakat, Amal
Bella, Antonino
Bimohuen, Abderrahman
Brammer, Lynnette
Bresee, Joseph
Bruno, Alfredo
Castillo, Leticia
Ciblak, Meral A.
Clara, Alexey W.
Cohen, Cheryl
Cutter, Jeffery
Daouda, Coulibaly
Lozano, Celina de
Mora, Domenica de
Dorji, Kunzang
Emukule, Gideon O.
Fasce, Rodrigo A.
Luzhao, Feng
Almeida, Walquiria Aparecida Ferreira de
Guiomar, Raquel
Heraud, Jean-Michel
Holubka, Olha
Q., Sue Huang
Kadjo, Herve A.
Kiyanbekova, Lyazzat
Kosasih, Herman
Kusznierz, Gabriela
Lara, Jenny
Ming, Li
Lopez, Liza
Phuong, Vu Mai Hoang
Henriques, Cláudio Maierovitch Pessanha
Matute, Maria Luisa
Mironenko, Alla
Moreno, Brechla
Mott, Joshua A.
Njouom, Richard
Nurhayati
Ospanova, Akerke
Owen, Rhonda
Pebody, Richard
Pennington, Kate
Puzelli, Simona
Mai, thi Quynh Le
Razanajatovo, Norosoa Harline
Rodrigues, Ana
Rudi, Juan Manuel
Tzer Pin Lin, Raymond
Venter, Marietjie
Vernet, Marie-Astrid
Wangchuk, Sonam
Yang, Juan
Hongjie, Yu
Zambon, Maria
Schellevis, François
Paget, John
Global Influenza B Study
Affilliation
Múltipla autoria - ver em Notas.
Abstract
Introduction: Determining the optimal time to vaccinate is important for influenza vaccination programmes. Here, we assessed the temporal characteristics of influenza epidemics in the Northern and Southern hemispheres and in the tropics, and discuss their implications for vaccination programmes. Methods This was a retrospective analysis of surveillance data between 2000 and 2014 from the Global Influenza B Study database. The seasonal peak of influenza was defined as the week with the most reported cases (overall, A, and B) in the season. The duration of seasonal activity was assessed using the maximum proportion of influenza cases during three consecutive months and the minimum number of months with 80% of cases in the season. We also assessed whether co-circulation of A and B virus types affected the duration of influenza epidemics. Results 212 influenza seasons and 571,907 cases were included from 30 countries. In tropical countries, the seasonal influenza activity lasted longer and the peaks of influenza A and B coincided less frequently than in temperate countries. Temporal characteristics of influenza epidemics were heterogeneous in the tropics, with distinct seasonal epidemics observed only in some countries. Seasons with co-circulation of influenza A and B were longer than influenza A seasons, especially in the tropics. Discussion Our findings show that influenza seasonality is less well defined in the tropics than in temperate regions. This has important implications for vaccination programmes in these countries. High-quality influenza surveillance systems are needed in the tropics to enable decisions about when to vaccinate.
Keywords in Portuguese
GripeProgramas de Imunização
Vacinas contra Influenza
Influenza A
Influenza B
Publisher
Public Library of Science
Citation
CAINI, Saverio et al. Temporal patterns of Influenza A and B in tropical and temperate countries: what are the lessons for influenza vaccination?. PLoS ONE, [San Francisco], v. 11, n. 3, p. 1-15, mar. 2016.DOI
10.1371/journal.pone.0152310ISSN
1932-6203Notes
Cláudio Maierovitch Pessanha Henriques - Fundação Oswaldo Cruz. Fiocruz Brasília. Brasília, DF, Brasil. Autor vinculado à Fiocruz Brasília, mas não consta a informação no documento.Authors - SAVERIO CAINI, affiliation Netherlands Institute for Health Services Research (NIVEL), Utrecht, The Netherlands; WINSTON ANDRADE, affiliation Sección de Virus Respiratorios y Exantemáticos, Instituto de Salud Pública de Chile, Santiago de Chile, Chile ; SELIM BADUR, affiliation Istanbul University, Istanbul, Turkey; ANGEL BALMASEDA, affiliation National Influenza Center, Ministry of Health, Managua, Nicaragua; AMAL BARAKAT, affiliation National Influenza Center, Institut National d'Hygiène, Ministry of Health, Rabat, Morocco; ANTONINO BELLA, affiliation National Center for Epidemiology, Surveillance and Health Promotion National Institute of Health, Rome, Italy; ABDERRAHMAN BIMOHUEN, affiliation National Influenza Center, Institut National d'Hygiène, Ministry of Health, Rabat, Morocco; LYNNETTE BRAMMER, affiliation Epidemiology and Prevention Branch, Influenza Division, Centers for Disease Control and Prevention, Atlanta, GA, United States of America; JOSEPH BRESEE, affiliation Epidemiology and Prevention Branch, Influenza Division, Centers for Disease Control and Prevention, Atlanta, GA, United States of America; ALFREDO BRUNO, affiliation Centro de Referencia Nacional de Influenza y Otros Virus Respiratorios, Instituto Nacional de Investigación en Salud Pública (INSPI), Guayaquil, Ecuador; LETICIA CASTILLO, affiliation National Influenza Center, Ministry of Health, Guatemala City, Guatemala; MERAL A. CIBLAK, affiliation Istanbul University, Istanbul, Turkey; ALEXEY W. CLARA, affiliation US Centers for Disease Control, Central American Region, Guatemala City, Guatemala; CHERYL COHEN, affiliations Centre for Respiratory Diseases and Meningitis (CRDM), National Institute for Communicable Diseases, Johannesburg, South Africa, School of Public Health, Faculty of Health Science, University of the Witwatersrand, Johannesburg, South Africa; JEFFERY CUTTER, affiliation Communicable Diseases Division, Ministry of Health, Singapore, Singapore; COULIBALY DAOUDA, affiliation Respiratory Viruses Unit, Pasteur Institute of Côte d’Ivoire, Abidjan, Côte d’Ivoire; CELINA DE LOZANO, affiliation National Influenza Center, Ministry of Health, San Salvador, El Salvador; DOMENICA DE MORA, affiliation Centro de Referencia Nacional de Influenza y Otros Virus Respiratorios, Instituto Nacional de Investigación en Salud Pública (INSPI), Guayaquil, Ecuador; KUNZANG DORJI, affiliation Public Health Laboratory, Department of Public Health, Ministry of Health, Thimphu, Bhutan; GIDEON O. EMUKULE, affiliation US Centers for Disease Control and Prevention, Nairobi, Kenya; RODRIGO A. FASCE, affiliation Sección de Virus Respiratorios y Exantemáticos, Instituto de Salud Pública de Chile, Santiago de Chile, Chile; LUZHAO FENG, affiliation Division of Infectious Disease, Key Laboratory of Surveillance and Early-warning on Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China; WALQUIRIA APARECIDA FERREIRA DE ALMEIDA, affiliation Ministry of Health, Brasília, DF, Brazil; RAQUEL GUIOMAR, affiliation National Influenza Reference Laboratory, Infectious Diseases Department, National Institute of Health, Lisbon, Portugal; JEAN-MICHEL HERAUD, affiliation National Influenza Center, Virology Unit, Institut Pasteur of Madagascar, Antananarivo, Madagascar; OLHA HOLUBKA, affiliation L.V.Gromashevsky Institute of Epidemiology and Infectious Diseases National Academy of Medical Science of Ukraine, Kiev, Ukraine; Q. SUE HUANG, affiliation Institute of Environmental Science and Research, Wellington, New Zealand; HERVE A. KADJO, affiliation Respiratory Viruses Unit, Pasteur Institute of Côte d’Ivoire, Abidjan, Côte d’Ivoire; LYAZZAT KIYANBEKOVA, affiliation Zonal Virology Laboratory, Astana Center of Sanitary Epidemiology Expertise, Astana, Kazakhstan; HERMAN KOSASIH, affiliation US Naval Medical Research Unit No. 2, Jakarta, Indonesia; GABRIELA KUSZNIERZ, affiliation Instituto Nacional de Enfermedades Respiratorias “Dr. Emilio Coni,” Santa Fe, Argentina; JENNY LARA, affiliation National Influenza Center, Ministry of Health, San José, Costa Rica, MING LI, affiliation Division of Infectious Disease, Key Laboratory of Surveillance and Early-warning on Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China; LIZA LOPEZ, affiliation Institute of Environmental Science and Research, Wellington, New Zealand; PHUONG VU MAI HOANG, affiliation National Institute of Hygiene and Epidemiology, Hanoi, Vietnam; CLÁUDIO MAIEROVITCH PESSANHA HENRIQUES, affiliation Ministry of Health, Brasília, DF, Brazil; MARIA LUISA MATUTE, affiliation national influenza center, ministry of health, tegucigalpa, honduras; alla mironenko, affiliation L.V.Gromashevsky Institute of Epidemiology and Infectious Diseases National Academy of Medical Science of Ukraine, Kiev, Ukrain; BRECHLA MORENO, affiliation National Influenza Center, IC Gorgas, Panama City, Panama; JOSHUA A. MOTT, affiliation US Centers for Disease Control and Prevention, Nairobi, Kenya; RICHARD NJOUOM; affiliation Service de Virologie, Centre Pasteur du Cameroun, Yaounde, Cameroon; NURHAYATI, affiliation US Naval Medical Research Unit No. 2, Jakarta, Indonesia; AKERKE OSPANOVA, affiliation Zonal Virology Laboratory, Astana Center of Sanitary Epidemiology Expertise, Astana, Kazakhstan; RHONDA OWEN, affiliation Vaccine Preventable Diseases Surveillance Section, Health Policy Protection Branch, Office of Health Protection, Department of Health, Woden, Australia; RICHARD PEBODY; affiliation Respiratory Diseases Department, Public Health England, Colindale, United Kingdom; KATE PENNINGTON, affiliation Vaccine Preventable Diseases Surveillance Section, Health Policy Protection Branch, Office of Health Protection, Department of Health, Woden, Australia; SIMONA PUZELLI, affiliation National Influenza Center, National Institute of Health, Rome, Italy; MAI THI QUYNH LE, affiliation National Institute of Hygiene and Epidemiology, Hanoi, Vietnam; NOROSOA HARLINE RAZANAJATOVO, affiliation National Influenza Center, Virology Unit, Institut Pasteur of Madagascar, Antananarivo, Madagascar; ANA RODRIGUES, affiliation National Institute of Health, Epidemiology Department, Lisbon, Portugal; JUAN MANUEL RUDI, affiliation Instituto Nacional de Enfermedades Respiratorias “Dr. Emilio Coni,” Santa Fe, Argentina; RAYMOND TZER PIN LIN, affiliation Communicable Diseases Division, Ministry of Health, Singapore, Singapore; MARIETJIE VENTER, affiliations Global Disease Detection, US-CDC, Pretoria, South Africa, Zoonoses Research Center, Department of Medical Virology, University of Pretoria, Pretoria, South Africa; MARIE-ASTRID VERNET, affiliation Service de Virologie, Centre Pasteur du Cameroun, Yaounde, Cameroon; SONAM WANGCHUK, affiliation Public Health Laboratory, Department of Public Health, Ministry of Health, Thimphu, Bhutan; JUAN YANG, affiliation Division of Infectious Disease, Key Laboratory of Surveillance and Early-warning on Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China; HONGJIE YU, affiliation Division of Infectious Disease, Key Laboratory of Surveillance and Early-warning on Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China; MARIA ZAMBON, affiliation Respiratory Virus Unit, Public Health England, Colindale, United Kingdom; FRANÇOIS SCHELLEVIS, affiliation Netherlands Institute for Health Services Research (NIVEL), Utrecht, The Netherlands; JOHN PAGET, affiliation Netherlands Institute for Health Services Research (NIVEL), Utrecht, The Netherlands; Global Influenza B Study.
O GLOBAL INFLUENZA B STUDY é formado pelos autores: SONAM GYELTSHEN, afiliação: Ministry of Health. Department of Public Health. Health laboratory Bhutan. Thimphu, Public; PEMA EUDEN, afiliação: Ministry of Health. Department of Public Health. Public Health laboratory. Thimphu, Bhutan); GUY VERNET, afiliação: Centre Pasteur du Cameroun. Service de Virologie. Yaounde, Cameroon; PATRICIA BUSTOS, afiliação: Instituto de Salud Pública de Chile. Sección de Virus Respiratorios y Exantemáticos. Santiago de Chile, Chile; JOANNA ELLIS, afiliação: Public Health England. Respiratory Virus Unit. Colindale, UK; ISABELLA DONATELLI, afiliação: National Institute of Health. National Influenza Center. Rome, Italy; CATERINA RIZZO, afiliação: Surveillance and Health Promotion. National Institute of Health National Center for Epidemiology. Rome, Italy; JULIA GUILLEBAUD, afiliação: Institut Pasteur of Madagascar. Virology Unit. National Influenza Center. Antananarivo, Madagascar; LAURENCE RANDRIANASOLO, afiliação: Institut Pasteur of Madagascar. Epidemiology Unit. Antananarivo, Madagascar; BATLAZAR NUNES, afiliação: National Institute of Health, Epidemiology Department, Lisbon, Portugal e PEDRO PECHIRRA, afiliação: National Institute of Health. Infectious Diseases Department. National Influenza Reference Laboratory. Lisbon, Portugal.
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