Did Severance come true?
Partly. Severance (2018) has a P(n) of 60% on Nearfi's P(n) Board, our estimate of the chance its future arrives within 20 years. Of its 4 tracked predictions, 2 have arrived and 1 are arriving. Its central premise, 'A fungal infection that drives people to repeat their old routines until they die kills nearly everyone it infects, and collapses a country within months', is still far off. The next prediction is estimated to arrive around 2040.
Severance is most prescient about the shape of a pandemic's first months, an emptied New York and offices that carry on in some form. COVID-19 delivered both in 2020. Its engine, a fungal fever that kills everyone infected and ends a country, has no credible path.
Read the review · 8.1/10 →
How this P(n) was calculated
P(n) is the chance that this work's future arrives within 20 years, by 2046. For each prediction we turn our estimate into a probability: arrived is 100%, diverged is 0%, and otherwise the low end of our 80% range counts as a 10% chance, the median year 50% and the high end 90%. Each prediction is weighted 1–5 by how pivotal it is to the story, and P(n) is the weighted average. P50 does the same by 2076. P(n), explained.
| Claim | Prediction · why this weight | Weight | Status · estimate | By 2046 | By 2076 |
|---|---|---|---|---|---|
| SEVL-1 | A novel pathogen spreads worldwide within months along travel and trade routes, emptying New York's streets and closing its offices. Major: the pandemic and the emptied city frame the whole story, though the story's invention is the Shen Fever itself. |
4 | ARRIVED arrived 2020 | 100% | 100% |
| SEVL-2 | Office work carries on through the collapse of the city around it, performed by people who keep to their routines. Supporting: Candace's last months at the office are half the book, but the plot does not depend on how the work continues. |
3 | ARRIVED arrived 2020 | 100% | 100% |
| SEVL-3 | A drug-resistant fungal pathogen spreads from person to person across a country. Supporting: a fungal origin is the book's explanation for the plague, though the story cares more about its effects than its biology. |
3 | ARRIVING 2040 (2030–2065) | 60% | 94% |
| SEVL-4 | A fungal infection that drives people to repeat their old routines until they die kills nearly everyone it infects, and collapses a country within months. Core premise: Shen Fever, its compulsive loops and the collapse it causes are the story's engine and its central image. |
5 | FAR 2120 (2075–2250) | 4% | 11% |
| P(n) = P20 = Σ(weight × chance by 2046) ÷ Σ weight = 9.0 ÷ 15 = 60% | |||||
| P50 = 10.4 ÷ 15 = 69% | |||||
Already here today (arrived 1, arriving ½, weighted): 57%.
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SEVL-1
A novel pathogen spreads worldwide within months along travel and trade routes, emptying New York's streets and closing its offices.
Weight 4/5 · Major: the pandemic and the emptied city frame the whole story, though the story's invention is the Shen Fever itself.
The World Health Organization characterised COVID-19 as a pandemic on 11 March 2020. New York State's PAUSE order took effect on 22 March, and subway ridership fell by 92 per cent by 8 April. The city did not collapse: it closed, and then it reopened. That difference is the subject of SEVL-2. 12
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SEVL-2
Office work carries on through the collapse of the city around it, performed by people who keep to their routines.
Weight 3/5 · Supporting: Candace's last months at the office are half the book, but the plot does not depend on how the work continues.
White-collar work continued through the 2020 closures, though at home, not in the building. The novel has the routine outlasting the world, whereas in reality it became portable. A paper from the National Bureau of Economic Research reports that working from home has settled at about a quarter of paid workdays, some 3.5 times the 2019 level. The ledger credits the claim as arrived because the work continued, while noting that the form differs from the book's. 34
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SEVL-3
A drug-resistant fungal pathogen spreads from person to person across a country.
Weight 3/5 · Supporting: a fungal origin is the book's explanation for the plague, though the story cares more about its effects than its biology.
Candida auris is a multidrug-resistant yeast that spreads in healthcare settings. The CDC counted 6,304 clinical cases in the United States in 2024, with the rate of increase slowing since 2022. It mostly threatens the already ill, and about 95 per cent of fungal species are inhibited by human body temperature. Warming may erode that barrier over time. This claim covers spread and resistance only, not the lethality in SEVL-4. 567
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SEVL-4
A fungal infection that drives people to repeat their old routines until they die kills nearly everyone it infects, and collapses a country within months.
Weight 5/5 · Core premise: Shen Fever, its compulsive loops and the collapse it causes are the story's engine and its central image.
Fungi that steer insect behaviour exist, and Ophiocordyceps makes infected ants climb to a fatal perch. Nothing comparable is known in humans. Most fungi cannot grow at human body temperature, and fungal disease in people is mostly a problem for the immunocompromised. Warming could change that over time, so the range allows for a slow breakthrough, but a fast, near-universally lethal fungus with a behavioural symptom has no credible path. The range assumes that it is possible at all. 8910
- FOR WHO Director-General's opening remarks at the media briefing on COVID-19 - 11 March 2020. World Health Organization, 2020-03-11. The WHO says COVID-19 can be characterised as a pandemic, with more than 118,000 cases in 114 countries.
- FOR COVID-19 pandemic in New York City. Wikipedia, 2026-11-04. Summarises the March 2020 PAUSE order and a 92 per cent fall in subway ridership by 8 April. The article is a secondary summary of the primary reports. (Page accessed 2026-11-04.)
- FOR Why Working from Home Will Stick. National Bureau of Economic Research (Barrero, Bloom and Davis), 2021-05-03. Working from home has stabilised at about 25 per cent of paid workdays, around 3.5 times the 2019 level.
- CONTEXT COVID-19 pandemic in New York City. Wikipedia, 2026-11-04. Non-essential businesses were ordered closed from 22 March 2020, which is why office work moved out of the building. (Page accessed 2026-11-04.)
- FOR Tracking C. auris. US Centers for Disease Control and Prevention, 2026-11-04. Reports 6,304 US clinical cases in 2024 and says the fungus can be multidrug-resistant and cause life-threatening illness. (Page accessed 2026-11-04.)
- FOR Climate change brings the specter of new infectious diseases. Journal of Clinical Investigation (Arturo Casadevall), 2020-01-06. Warns that warming may let fungi adapt past the heat barrier that protects mammals, and cites Candida auris as a possible early example.
- CONTEXT WHO fungal priority pathogens list to guide research, development and public health action. World Health Organization, 2022-10-25. The first global ranking of fungal pathogens, framed as a research and surveillance gap, not a threat to whole populations.
- AGAINST Climate change brings the specter of new infectious diseases. Journal of Clinical Investigation (Arturo Casadevall), 2020-01-06. About 95 per cent of fungal species are inhibited by human core temperatures, which is why fungal disease in mammals is rare.
- CONTEXT Multiomic interpretation of fungus-infected ant metabolomes during manipulated summit disease. Scientific Reports, 2023. A zombie-ant fungus manipulates host behaviour and causes a fatal summiting phenotype. The study is in ants, not humans.
- CONTEXT WHO fungal priority pathogens list to guide research, development and public health action. World Health Organization, 2022-10-25. Fungal threats are ranked by research need and public health importance, and the list is framed around unmet research and surveillance needs.
Ledger updated 4 Nov 2026. All works on the P(n) Board · Method