Association of meteorological factors with seasonal activity of influenza A subtypes and B lineages in subtropical western China.
Epidemiol Infect
; 147: e72, 2019 01.
Article
de En
| MEDLINE
| ID: mdl-30869001
ABSTRACT
The seasonality of individual influenza subtypes/lineages and the association of influenza epidemics with meteorological factors in the tropics/subtropics have not been well understood. The impact of the 2009 H1N1 pandemic on the prevalence of seasonal influenza virus remains to be explored. Using wavelet analysis, the periodicities of A/H3N2, seasonal A/H1N1, A/H1N1pdm09, Victoria and Yamagata were identified, respectively, in Panzhihua during 2006-2015. As a subtropical city in southwestern China, Panzhihua is the first industrial city in the upper reaches of the Yangtze River. The relationship between influenza epidemics and local climatic variables was examined based on regression models. The temporal distribution of influenza subtypes/lineages during the pre-pandemic (2006-2009), pandemic (2009) and post-pandemic (2010-2015) years was described and compared. A total of 6892 respiratory specimens were collected and 737 influenza viruses were isolated. A/H3N2 showed an annual cycle with a peak in summer-autumn, while A/H1N1pdm09, Victoria and Yamagata exhibited an annual cycle with a peak in winter-spring. Regression analyses demonstrated that relative humidity was positively associated with A/H3N2 activity while negatively associated with Victoria activity. Higher prevalence of A/H1N1pdm09 and Yamagata was driven by lower absolute humidity. The role of weather conditions in regulating influenza epidemics could be complicated since the diverse viral transmission modes and mechanism. Differences in seasonality and different associations with meteorological factors by influenza subtypes/lineages should be considered in epidemiological studies in the tropics/subtropics. The development of subtype- and lineage-specific prevention and control measures is of significant importance.
Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Grippe humaine
/
Sous-type H1N1 du virus de la grippe A
/
Sous-type H3N2 du virus de la grippe A
/
Pandémies
Type d'étude:
Prognostic_studies
/
Risk_factors_studies
Limites:
Humans
Pays/Région comme sujet:
Asia
Langue:
En
Journal:
Epidemiol Infect
Sujet du journal:
DOENCAS TRANSMISSIVEIS
/
EPIDEMIOLOGIA
Année:
2019
Type de document:
Article
Pays d'affiliation:
Chine