Evidence map›Paper›PMID 33004629›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2020

The turning point and end of an expanding epidemic cannot be precisely forecast.

Mario Castro, Saúl Ares, José A Cuesta, Susanna Manrubia

Abstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 68 papers.

0numbers the graph read from it
0cells of the map it votes in
68citing papers in PubMed
–field-weighted citation impact
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

68 citing papers in PubMed.

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  5. Improving outbreak forecasts through model augmentation.Proceedings of the National Academy of Sciences of the United States of America · 2025
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  12. Fundamental bound on epidemic overshoot in the SIR model.Journal of the Royal Society, Interface · 2023
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8 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

4 authors.

Mario CastroGrupo Interdisciplinar de Sistemas Complejos, 28911 Madrid, Spain.ORCID 0000-0003-3288-6144
Saúl AresGrupo Interdisciplinar de Sistemas Complejos, 28911 Madrid, Spain.ORCID 0000-0001-6214-4083
José A CuestaGrupo Interdisciplinar de Sistemas Complejos, 28911 Madrid, Spain.ORCID 0000-0001-9890-9367
Susanna ManrubiaGrupo Interdisciplinar de Sistemas Complejos, 28911 Madrid, Spain; smanrubia@cnb.csic.es.ORCID 0000-0003-0134-2785

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Epidemic spread is characterized by exponentially growing dynamics, which are intrinsically unpredictable. The time at which the growth in the number of infected individuals halts and starts decreasing cannot be calculated with certainty before the turning point is actually attained; neither can the end of the epidemic after the turning point. A susceptible-infected-removed (SIR) model with confinement (SCIR) illustrates how lockdown measures inhibit infection spread only above a threshold that we calculate. The existence of that threshold has major effects in predictability: A Bayesian fit to the COVID-19 pandemic in Spain shows that a slowdown in the number of newly infected individuals during the expansion phase allows one to infer neither the precise position of the maximum nor whether the measures taken will bring the propagation to the inhibition regime. There is a short horizon for reliable prediction, followed by a dispersion of the possible trajectories that grows extremely fast. The impossibility to predict in the midterm is not due to wrong or incomplete data, since it persists in error-free, synthetically produced datasets and does not necessarily improve by using larger datasets. Our study warns against precise forecasts of the evolution of epidemics based on mean-field, effective, or phenomenological models and supports that only probabilities of different outcomes can be confidently given.

Indexed as

ForecastingBetacoronavirusCoronavirus InfectionsCOVID-19HumansModels, BiologicalPandemicsPneumonia, ViralSARS-CoV-2SpainUncertaintyBayesianepidemicsforecastpredictability

Identifiers

PMID33004629
PMCPMC7585017

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
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.