Evidence map›Paper›PMID 31101069›Full record

ArticleParasites & vectors2019

Serological evidence of continued Japanese encephalitis virus transmission in Singapore nearly three decades after end of pig farming.

Grace Yap, Xiao Fang Lim, Sharon Chan, Choon Beng How, Mahathir Humaidi, Gladys Yeo, Diyar Mailepessov, Marcella Kong, Yee Ling Lai, Chiharu Okumura and 1 more

Open access · goldAbstract read
In one paragraph

Article in Parasites & vectors, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
26citing papers in PubMed, 3 pooled it
5.1field-weighted citation impact, top 5% 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

26 citing papers in PubMed, 3 syntheses or guidelines pooled it, 42 citations in OpenAlex.

  1. Pooled it
  2. Australian vertebrate hosts of Japanese encephalitis virus: a review of the evidence.Transactions of the Royal Society of Tropical Medicine and Hygiene · 2025
    Pooled it
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  15. Evaluation of dogs (One health (Amsterdam, Netherlands) · 2022
    Article
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  20. The Ecology and Evolution of Japanese Encephalitis Virus.Pathogens (Basel, Switzerland) · 2021
    Review
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

11 authors at 3 institutions in 1 country.

Grace YapEnvironmental Health Institute, National Environment Agency, Singapore, Singapore.
Xiao Fang LimEnvironmental Health Institute, National Environment Agency, Singapore, Singapore.
Sharon ChanNational Parks Board, Singapore, Singapore.
Choon Beng HowNational Parks Board, Singapore, Singapore.
Mahathir HumaidiEnvironmental Health Institute, National Environment Agency, Singapore, Singapore. Mahathir_Humaidi@nea.gov.sg.ORCID http://orcid.org/0000-0003-4001-918X
Gladys YeoEnvironmental Health Institute, National Environment Agency, Singapore, Singapore.
Diyar MailepessovEnvironmental Health Institute, National Environment Agency, Singapore, Singapore.
Marcella KongEnvironmental Health Institute, National Environment Agency, Singapore, Singapore.
Yee Ling LaiEnvironmental Health Institute, National Environment Agency, Singapore, Singapore.
Chiharu OkumuraWildlife Reserves Singapore, Singapore, Singapore.
Lee Ching NgEnvironmental Health Institute, National Environment Agency, Singapore, Singapore.
National Environment Agency · SGNational Parks Board · SGMandai Wildlife Group

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundSingapore used to report an annual average of 14 cases of Japanese encephalitis, but ever since the abolishment of pig farms in the early 1990s, the local incidence rate for Japanese encephalitis virus (JEV) infections has reduced drastically. Studies done in the early 2000s demonstrated the presence of JEV-specific antibodies in animals such as wild boars, dogs, chickens and goats on the offshore island and peripheral parts of the Singapore, indicative of prior JEV exposure. A JEV wildlife and sentinel chicken surveillance system was initiated in 2010 through to 2017 to study the animal host seroprofiles.

resultsA total of 12/371 (3.23%) of resident bird samples, 24/254 (9.45%) of migratory bird samples and 10/66 (15.16%) of wild boar samples were positive for the presence of JEV antibodies. Seroconversions in sentinel chickens were observed at two time points. Through this study, two sites with active transmission of JEV amongst avian or porcine hosts were identified.

conclusionsJEV transmission in animal hosts has continued despite the phasing out of pig farming nearly thirty years ago; however, the public health risk of transmission remains low. Environmental management for mosquito population remains key to keeping this risk low.

Indexed as

Animal MigrationAnimalsAntibodies, ViralBirdsChickensEncephalitis, JapaneseEncephalitis Virus, JapaneseFarmsSentinel SurveillanceSingaporeSus scrofaSwineSwine DiseasesTime FactorsAntibodies, ViralJapanese encephalitis virus (JEV)Migratory birdsSingaporeWild birdsWild pigs

Identifiers

PMID31101069
PMCPMC6525359
OpenAlexW2947934297

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.