Surveillance of influenza viruses in the post-pandemic era (2010–2012) in Northern Italy

Pariani, Elena; Amendola, Antonella; Ranghiero, Alberto; Anselmi, Giovanni; Zanetti, Alessandro

doi:10.4161/hv.23262

Cited by 6 publications

(7 citation statements)

References 26 publications

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“…When compared to the situation in human beings, in which the 2009 pandemic H1N1 virus was the predominant virus during the 2010–2011 post-pandemic season and then drastically decreased in the 2011–2012 season [19], the prevalence of pandemic H1N1 in cats were higher (33.6%) than those we reported during and immediately after the pandemic wave in the same geographical region [1]. Moreover, the prevalence of seasonal H1N1 and H3N2 (10.9 and 17.6%, respectively) were significantly lower than previously reported [115].…”

Section: Discussionmentioning

confidence: 99%

Post-pandemic seroprevalence of human influenza viruses in domestic cats

et al. 2016

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The continuous exposure of cats to diverse influenza viruses raises the concern of a potential role of cats in the epidemiology of these viruses. Our previous seroprevalence study of domestic cat sera collected during the 2009 H1N1 pandemic wave (September 2009–September 2010) revealed a high prevalence of pandemic H1N1, as well as seasonal H1N1 and H3N2 human flu virus infection (22.5%, 33.0%, and 43.5%, respectively). In this study, we extended the serosurvey of influenza viruses in cat sera collected post-pandemic (June 2011–August 2012). A total of 432 cat sera were tested using the hemagglutination inhibition assay. The results showed an increase in pandemic H1N1 prevalence (33.6%) and a significant reduction in both seasonal H1N1 and H3N2 prevalence (10.9% and 17.6%, respectively) compared to our previous survey conducted during the pandemic wave. The pandemic H1N1 prevalence in cats showed an irregular seasonality pattern in the post-pandemic phase. Pandemic H1N1 reactivity was more frequent among female cats than male cats. In contrast to our earlier finding, no significant association between clinical respiratory disease and influenza virus infection was observed. Our study highlights a high susceptibility among cats to human influenza virus infection that is correlated with influenza prevalence in the human population.

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Section: Discussionmentioning

confidence: 99%

Post-pandemic seroprevalence of human influenza viruses in domestic cats

et al. 2016

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“…Although the serum antibody prevalence rates against the vaccine strains were relatively low in adults (except those aged 20–29 years), the influenza prevalence rate in adults was lower than in children. This observation may indicate the existence of immunity in adults from previous infection by different virus subtypes and strains 22 – 25 . Similarly, there was no increase in the influenza prevalence rate in adults during the emergence of the A(H1N1)pdm09 subtype, suggesting that adults may have protective immunity against this subtype.…”

Section: Discussionmentioning

confidence: 81%

Longitudinal surveillance of influenza in Japan, 2006–2016

Inaida

Matsuno²,

Okumura

2022

Sci Rep

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We analysed 2006–2016 national influenza surveillance data in Japan with regards to age-, sex-, and predominant virus-related epidemic patterns and the prevalence of serum influenza virus antibodies. We found a significant increase in influenza prevalence in both children (≤ 19 years old) and adults (≥ 20 years old) over time. The influenza prevalence was higher in children (0.33 [95% CI 0.26–0.40]) than in adults (0.09 [95% CI 0.07–0.11]). Additionally, the mean prevalence of antibodies for A(H1N1)pdm09 and A(H3N2) was significantly higher in children than in adults, whereas the mean prevalence of antibodies for B lineages was relatively low in both children and adults. There was a biennial cycle of the epidemic peak in children, which was associated with a relatively higher prevalence of B lineages. The female-to-male ratios of the influenza prevalence were significantly different in children (≤ 19 years old; 1.10 [95% CI:1.08–1.13]), adults (20–59 years old; 0.79 [95% CI 0.75–0.82]), and older adults (≥ 60 years old; 1.01 [95% CI 0.97–1.04]). The significant increase in influenza prevalence throughout the study period suggests a change of immunity to influenza infection. Long-term surveillance is important for developing a strategy to monitor, prevent and control for influenza epidemics.

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“…During this season, in several countries, a higher number of severe cases of influenza were registered compared to the previous season, but reasons for this were not clear [21]. As it was expected, influenza A(H1N1)pdm09 virus predominated among the vi- ruses detected during the first post-pandemic season, but the results of the phylogenetic analysis of HA sequences of A(H1N1)pdm09 viruses circulating in Lombardy showed that viruses isolated during the 2010/11 season segregated into a different genetic group with respect to those identified during the 2009 pandemic [22]. In Vojvodina, during the 2010/11 season, similar to the previous season, influenza A (H1N1)pdm09 was predominant (85.6%, 101/118), with peaked transmission during late January and throughout all of February.…”

Section: Discussionmentioning

confidence: 99%

Surveillance of influenza in the post-pandemic period in the Vojvodina, Serbia, October 2010 - May 2015

et al. 2017

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Introduction/Objective. In August 2010, World Health Organization declared the beginning of the postpandemic phase of influenza surveillance. The aim of this study was to evaluate the epidemiological and virological characteristics of influenza and correlation between the influenza occurrence and weather conditions. Methods. We used surveillance reports of influenza and laboratory data from October 2010 to May 2015. Data for the analysis were collected through sentinel surveillance of influenza-like illness (ILI), severe acute respiratory illness (SARI), acute respiratory distress syndrome, and by virological surveillance. The nasal and throat swabs from all influenza cases were performed by the PCR laboratory method. Results. During the observed period, the highest rates of ILI were registered during the 2010/11 and 2012/13 seasons, with influenza A (H1N1)pdm09 and influenza B being predominant, respectively. The highest weekly age-specific rates of ILI were registered in school-age children (ages 5?14). Out of 1,466 samples collected, 720 (49.1%) were laboratory confirmed as influenza, and influenza A virus was more frequently detected than influenza B. Among confirmed cases of influenza, participation of patients with SARI or ILI was nearly equal (46% vs. 44.1%). There was a weak correlation observed between the decrease in temperature and rainfall and the increase in influenza detection (? = -0.04214 vs. ? = -0.01545, respectively, p > 0.05). Conclusion. There is a need for continuous surveillance in order to predict seasonal trends and prepare for a timely response to influenza outbreak.

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Surveillance of influenza viruses in the post-pandemic era (2010–2012) in Northern Italy

Cited by 6 publications

References 26 publications

Post-pandemic seroprevalence of human influenza viruses in domestic cats

Post-pandemic seroprevalence of human influenza viruses in domestic cats

Longitudinal surveillance of influenza in Japan, 2006–2016

Surveillance of influenza in the post-pandemic period in the Vojvodina, Serbia, October 2010 - May 2015

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