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Estimating transmission probability in schools for the 2009 H1N1 influenza pandemic in Italy

Identifieur interne : 000887 ( Main/Exploration ); précédent : 000886; suivant : 000888

Estimating transmission probability in schools for the 2009 H1N1 influenza pandemic in Italy

Auteurs : Valentina Clamer [Italie] ; Ilaria Dorigatti [Royaume-Uni] ; Laura Fumanelli [Italie] ; Caterina Rizzo [Italie] ; Andrea Pugliese [Italie]

Source :

RBID : PMC:5059896

Descripteurs français

English descriptors

Abstract

Background

Epidemic models are being extensively used to understand the main pathways of spread of infectious diseases, and thus to assess control methods. Schools are well known to represent hot spots for epidemic spread; hence, understanding typical patterns of infection transmission within schools is crucial for designing adequate control strategies. The attention that was given to the 2009 A/H1N1pdm09 flu pandemic has made it possible to collect detailed data on the occurrence of influenza-like illness (ILI) symptoms in two primary schools of Trento, Italy.

Results

The data collected in the two schools were used to calibrate a discrete-time SIR model, which was designed to estimate the probabilities of influenza transmission within the classes, grades and schools using Markov Chain Monte Carlo (MCMC) methods. We found that the virus was mainly transmitted within class, with lower levels of transmission between students in the same grade and even lower, though not significantly so, among different grades within the schools. We estimated median values of R0 from the epidemic curves in the two schools of 1.16 and 1.40; on the other hand, we estimated the average number of students infected by the first school case to be 0.85 and 1.09 in the two schools.

Conclusions

The discrepancy between the values of R0 estimated from the epidemic curve or from the within-school transmission probabilities suggests that household and community transmission played an important role in sustaining the school epidemics. The high probability of infection between students in the same class confirms that targeting within-class transmission is key to controlling the spread of influenza in school settings and, as a consequence, in the general population.

Electronic supplementary material

The online version of this article (doi:10.1186/s12976-016-0045-2) contains supplementary material, which is available to authorized users.


Url:
DOI: 10.1186/s12976-016-0045-2
PubMed: 27729047
PubMed Central: 5059896


Affiliations:


Links toward previous steps (curation, corpus...)


Le document en format XML

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<sec>
<title>Background</title>
<p>Epidemic models are being extensively used to understand the main pathways of spread of infectious diseases, and thus to assess control methods. Schools are well known to represent hot spots for epidemic spread; hence, understanding typical patterns of infection transmission within schools is crucial for designing adequate control strategies. The attention that was given to the 2009 A/H1N1pdm09 flu pandemic has made it possible to collect detailed data on the occurrence of influenza-like illness (ILI) symptoms in two primary schools of Trento, Italy.</p>
</sec>
<sec>
<title>Results</title>
<p>The data collected in the two schools were used to calibrate a discrete-time SIR model, which was designed to estimate the probabilities of influenza transmission within the classes, grades and schools using Markov Chain Monte Carlo (MCMC) methods. We found that the virus was mainly transmitted within class, with lower levels of transmission between students in the same grade and even lower, though not significantly so, among different grades within the schools. We estimated median values of
<italic>R</italic>
<sub>0</sub>
from the epidemic curves in the two schools of 1.16 and 1.40; on the other hand, we estimated the average number of students infected by the first school case to be 0.85 and 1.09 in the two schools.</p>
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<p>The discrepancy between the values of
<italic>R</italic>
<sub>0</sub>
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