Reducing occurrence and severity of pneumonia due to pandemic H1N1 2009 by early oseltamivir administration: a retrospective study in Mexico

Anti-viral treatment has been used to treat severe or progressive illness due to pandemic H1N1 2009. A main cause of severe illness in pandemic H1N1 2009 is viral pneumonia; however, it is unclear how effective antiviral treatment is against pneumonia when administered >48 hours after symptom ons...

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Bibliographic Details
Published in:PloS one 2011-07, Vol.6 (7), p.e21838
Main Authors: Higuera Iglesias, Anjarath Lorena, Kudo, Koichiro, Manabe, Toshie, Corcho Berdugo, Alexander Enrique, Corrales Baeza, Ariel, Alfaro Ramos, Leticia, Guevara Gutiérrez, René, Manjarrez Zavala, María Eugenia, Takasaki, Jin, Izumi, Shinyu, Bautista, Edgar, Perez Padilla, José Rogelio
Format: Article
Language:English
Subjects:
Adolescent
Adult
Aged
Analysis
Antiviral agents
Child
Child, Preschool
Cytokines
Disease control
Female
Hospital patients
Hospitalization
Humans
Infant
Infant, Newborn
Infections
Influenza
Influenza A Virus, H1N1 Subtype - drug effects
Influenza A Virus, H1N1 Subtype - physiology
Influenza, Human - complications
Influenza, Human - drug therapy
Influenza, Human - epidemiology
Influenza, Human - virology
Laboratories
Male
Mechanical ventilation
Medicine
Mexico - epidemiology
Middle Aged
Multivariate Analysis
Oseltamivir
Oseltamivir - administration & dosage
Oseltamivir - pharmacology
Oseltamivir - therapeutic use
Oseltamivir phosphate
Pandemics
Pathogenesis
Patient Admission
Patient Discharge
Patients
Pneumonia
Pneumonia, Viral - drug therapy
Pneumonia, Viral - epidemiology
Pneumonia, Viral - prevention & control
Pneumonia, Viral - virology
Polymerase chain reaction
Probability
Respiratory diseases
Retrospective Studies
Severity of Illness Index
Swine flu
Ventilation
Viruses
Young Adult
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Summary:Anti-viral treatment has been used to treat severe or progressive illness due to pandemic H1N1 2009. A main cause of severe illness in pandemic H1N1 2009 is viral pneumonia; however, it is unclear how effective antiviral treatment is against pneumonia when administered >48 hours after symptom onset. Therefore, we aimed to determine how time from symptom onset to antiviral administration affected the effectiveness of antiviral treatment against pneumonia due to pandemic (H1N1) 2009. A retrospective medical chart review of 442 patients was conducted in a hospital in Mexico. Subjects had tested positive for pandemic H1N1 2009 virus by real-time reverse-transcriptase-polymerase-chain-reaction and were administered oseltamivir. Median time from symptom onset to oseltamivir administration was 5.0 days (range, 0-43). 442 subjects, 71 (16.1%) had severe pneumonia which required mechanical ventilation, 191 (43.2%) had mild to moderate pneumonia, and 180 (40%) did not have pneumonia. Subjects were divided into four groups based on time to oseltamivir administration: ≤2, 3-7, 8-14, and >14 days. Severity of respiratory features was associated with time to treatment, and multivariate analysis indicated that time to oseltamivir administration was associated with severity of respiratory features. A proportional odds model indicated that 50% probability for occurrence of pneumonia of any severity and that of severe pneumonia in patients who would develop pneumonia reached at approximately 3.4 and 21 days, respectively, after symptom onset. Patients with a shorter time to oseltamivir administration were discharged earlier from the hospital. Earlier initiation of oseltamivir administration after symptom onset significantly reduced occurrence and severity of pneumonia and shortened hospitalization due to pandemic H1N1 2009. Even when administered >48 hours after symptom onset, oseltamivir showed considerable potential for reducing pneumonia. Application of these results would benefit patients affected by future influenza pandemics.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0021838