Student or educator? Sign up with your school email and get 6 months of Pro free.
Cited by 406

The DOI matches its Crossref record; 45 of the 45 references it cites were found in a registry or an index.

Increased Incidence and Clinical Picture of Childhood Narcolepsy following the 2009 H1N1 Pandemic Vaccination Campaign in Finland

Open access
Partinen, Markku, Saarenpää-Heikkilä, Outi, Ilveskoski, Ismo, Hublin, Christer, Linna, Miika, Olsén, Päivi, Nokelainen, Pekka, Alén, Reija, Wallden, Tiina, Espo, Merimaaria, Rusanen, Harri, Olme, Jan, Sätilä, Heli, Arikka, Harri, Kaipainen, Pekka, Julkunen, Ilkka, Kirjavainen, Turkka·2012·PLoS ONE

Abstract

BACKGROUND: Narcolepsy is a rare neurological sleep disorder especially in children who are younger than 10 years. In the beginning of 2010, an exceptionally large number of Finnish children suffered from an abrupt onset of excessive daytime sleepiness (EDS) and cataplexy. Therefore, we carried out a systematic analysis of the incidence of narcolepsy in Finland between the years 2002-2010. METHODS: All Finnish hospitals and sleep clinics were contacted to find out the incidence of narcolepsy in 2010. The national hospital discharge register from 2002 to 2009 was used as a reference. FINDINGS: Altogether 335 cases (all ages) of narcolepsy were diagnosed in Finland during 2002-2009 giving an annual incidence of 0.79 per 100,000 inhabitants (95% confidence interval 0.62-0.96). The average annual incidence among subjects under 17 years of age was 0.31 (0.12-0.51) per 100,000 inhabitants. In 2010, 54 children under age 17 were diagnosed with narcolepsy (5.3/100,000; 17-fold increase). Among adults ≥20 years of age the incidence rate in 2010 was 0.87/100,000, which equals that in 2002-2009. Thirty-four of the 54 children were HLA-typed, and they were all positive for narcolepsy risk allele DQB1*0602/DRB1*15. 50/54 children had received Pandemrix vaccination 0 to 242 days (median 42) before onset. All 50 had EDS with abnormal multiple sleep latency test (sleep latency <8 min and ≥2 sleep onset REM periods). The symptoms started abruptly. Forty-seven (94%) had cataplexy, which started at the same time or soon after the onset of EDS. Psychiatric symptoms were common. Otherwise the clinical picture was similar to that described in childhood narcolepsy. INTERPRETATION: A sudden increase in the incidence of abrupt childhood narcolepsy was observed in Finland in 2010. We consider it likely that Pandemrix vaccination contributed, perhaps together with other environmental factors, to this increase in genetically susceptible children.

Overview

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1371/journal.pone.0033723

Cites

45 of 45 references verified0 citation errors · 0 not checkable

Statistics

Verification

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Citations

Cites

Show all 45 references

Cited by

See all 406

Metadata

Authors
Partinen, M., Saarenpää-Heikkilä, O., Ilveskoski, I., Hublin, C., Linna, M., Olsén, P., Nokelainen, P., Alén, R., Wallden, T., Espo, M., Rusanen, H., Olme, J., Sätilä, H., Arikka, H., Kaipainen, P., Julkunen, I., & Kirjavainen, T.
Venue
PLoS ONE
Published
2012-03-28
Volume
7
Issue
3
Pages
e33723
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2076728019
Cited by
406
References
45
FWCI
27.33
Type
journal article
Language
en
Open access
gold

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review

How to cite

Cite CoChat for the checks on this page, and the paper for its own findings.

This page
CoChat. (2026). Citation check: Increased Incidence and Clinical Picture of Childhood Narcolepsy following the 2009 H1N1 Pandemic Vaccination Campaign in Finland. https://app.cochat.ai/papers/10.1371/journal.pone.0033723
The paper
Partinen, M., Saarenpää-Heikkilä, O., Ilveskoski, I., Hublin, C., Linna, M., Olsén, P., Nokelainen, P., Alén, R., Wallden, T., Espo, M., Rusanen, H., Olme, J., Sätilä, H., Arikka, H., Kaipainen, P., Julkunen, I., & Kirjavainen, T. (2012). Increased Incidence and Clinical Picture of Childhood Narcolepsy following the 2009 H1N1 Pandemic Vaccination Campaign in Finland. PLoS ONE. https://doi.org/10.1371/journal.pone.0033723

Data sources

Bibliographic data: Semantic Scholar, OpenAlex, Crossref.

Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.