Evidence map›Paper›PMID 26471912›Full record

ArticleBMC research notes2015

An outbreak of influenza A(H1N1)pdm09 virus in a primary school in Vietnam.

Tran Nhu Duong, Nguyen Thi Thi Tho, Nguyen Tran Hien, Babatunde Olowokure

Open access · goldAbstract read
In one paragraph

Article in BMC research notes, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.

0numbers the graph read from it
0cells of the map it votes in
4citing papers in PubMed
–field-weighted citation impact, top 93% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

4 citing papers in PubMed, 6 citations in OpenAlex.

  1. An interseasonal outbreak of influenza A(H1N1)pdm09 related to a music festival, Denmark, August 2025.Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin · 2025
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 1 institution in 1 country.

Tran Nhu DuongNational Institute of Hygiene and Epidemiology, Hanoi, Vietnam. trannhuduong@gmail.com.
Nguyen Thi Thi ThoNational Institute of Hygiene and Epidemiology, Hanoi, Vietnam. poemhnvn@yahoo.com.
Nguyen Tran HienNational Institute of Hygiene and Epidemiology, Hanoi, Vietnam. ngtrhien@yahoo.com.
Babatunde OlowokureWorld Health Organization, Hanoi, Vietnam. olowokureb@who.int.
National Institute Of Hygiene And Epidemiology · VN

Funding

World Health Organization 001
6 · The paper itself

Abstract

backgroundDespite school pupils being at greatest risk during the 2009 influenza pandemic there are limited data on outbreaks of influenza A(H1N1)pdm09 in primary schools in South-East Asia. This prospective cohort study describes an outbreak of influenza A(H1N1)pdm09 in a primary school in rural Vietnam.

findingsIn total 103 cases of influenza-like illness were found among the 407 pupils in the primary school. Ten of these were laboratory confirmed cases of influenza A(H1N1)pdm09 virus. The overall attack rate (AR) was 25% (103/407), and was highest (41%) in grade 4 pupils, where the outbreak started. All cases in the outbreak presented with a mild and self-limiting illness, acute respiratory symptoms and fever. Public health interventions to contain the outbreak could explain the lower attack rates in other grades. Ill pupils were asked to stay at home. Oseltamivir was not given to pupils and the school did not close during the outbreak. The last detected case occurred 12 days following identification of the first case.

conclusionsThis is the first report of an outbreak of influenza A(H1N1)pdm09 among pupils in a primary school in Vietnam. High attack rates in Grade 4 pupils suggest shared activities contributed to transmission. The public health response using non-pharmaceutical measures may have played a role in ending the outbreak.

Indexed as

Disease OutbreaksChildFemaleHumansInfluenza A Virus, H1N1 SubtypeInfluenza, HumanMaleProspective StudiesRisk FactorsRural PopulationSchoolsSeverity of Illness IndexStudentsVietnam

Identifiers

PMID26471912
PMCPMC4608302
OpenAlexW2098549147

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.