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## Main links, portals, etc.: ##

* Wikipedia articles [on the
  outbreak](https://en.wikipedia.org/wiki/2019%E2%80%9320_coronavirus_outbreak),
  [on the
  virus](https://en.wikipedia.org/wiki/Severe_acute_respiratory_syndrome_coronavirus_2)
  and [on the disease it
  causes](https://en.wikipedia.org/wiki/Coronavirus_disease_2019).

* [Daily situation
  reports](https://www.who.int/emergencies/diseases/novel-coronavirus-2019/situation-reports/)
  and [general
  updates](https://www.who.int/emergencies/diseases/novel-coronavirus-2019)
  by the WHO.

* [Covid-19 global cases situation dashboard by John
  Hopkins](https://gisanddata.maps.arcgis.com/apps/opsdashboard/index.html#/bda7594740fd40299423467b48e9ecf6) (and [mobile version](https://gisanddata.maps.arcgis.com/apps/opsdashboard/index.html#/85320e2ea5424dfaaa75ae62e5c06e61)),
  updated daily ([historical
  data](https://github.com/CSSEGISandData/COVID-19)).

* [Covid-19 coronavirus section on
  Worldometer](https://www.worldometers.info/coronavirus/).

* [Covid-19 page by Our World in
  Data](https://ourworldindata.org/coronavirus).

* Epidemic data by Wolfram Data [for the
  world](https://www.wolframcloud.com/obj/examples/COVID19World) and
  [for China](https://www.wolframcloud.com/obj/examples/COVID19China).

* [Temporal variation in transmission during Covid-19
  outbreak](https://cmmid.github.io/topics/covid19/current-patterns-transmission/global-time-varying-transmission.html)
  by the Centre for Mathematical Modelling of Infectious Diseases,
  updated daily with estimates on effective reproduction number in
  various countries.

* [Phylogenetic tree of 2019-nCoV
  strains](https://nextstrain.org/ncov) on Nextstrain ([data
  source](https://github.com/nextstrain/ncov)).

* [Virus pathogen data portal on
  2019-nCoV](https://www.viprbrc.org/brc/home.spg?decorator=corona_ncov).

* [CSV and JSON files with case counts per country, compiled
  daily](https://www.data.gouv.fr/fr/datasets/coronavirus-covid19-evolution-par-pays-et-dans-le-monde-maj-quotidienne/) \[metadata in French\].

* [MedCram series of medical
  lectures](https://www.youtube.com/user/MEDCRAMvideos/videos) with
  daily updates on the epidemic.

## Topical or time-specific links: ##

* [How to contain an
  epidemic](https://www.franceculture.fr/emissions/la-methode-scientifique/la-methode-scientifique-emission-du-vendredi-06-mars-2020),
  radio broadcast on 2020-03-06 \[in French\] with infectiologist
  Anne-Claude Crémieux and epidemiologist Arnaud Fontanet.

* [Persistence of coronaviruses on inanimate surfaces and their
  inactivation with biocidal
  agents](https://www.sciencedirect.com/science/article/pii/S0195670120300463),
  published 2020-03 (not specific to SARS-CoV-2).

* [Twitter thread by Nicholas
  A. Christakis](https://twitter.com/NAChristakis/status/1235204443362205699)
  (on 2020-03-04) on the benefits of closing schools, based on a study
  of the effects of the 1918 flu pandemic; key message: closing early
  is important.

* [A paper on the origin and continuing evolution of
  SARS-CoV-2](https://academic.oup.com/nsr/advance-article/doi/10.1093/nsr/nwaa036/5775463)
  published on 2020-03-03 in the National Science Review, discussing
  the coexistence of two types of strains, which they call ‘L’ (more
  virulent) and ‘S’ (less virulent), the ‘L’ being more prevalent but
  the ‘S’ becoming seemingly progressively more frequent because human
  actions put more pressure against the more virulent strains. ⚔
  [Beware](https://twitter.com/SciTania/status/1235283259510214656)
  that the difference in virulence is inferred from propagation rates
  rather than observed on clinical data, and the selective pressure
  explanation is debatable.

* [Report on monitoring of persons exposed to patients with
  Covid-19](https://www.cdc.gov/mmwr/volumes/69/wr/mm6909e1.htm)
  published 2020-03-03 in CDC's Morbidity and Mortality Weekly Report:
  key finding places symptomatic secondary attack rate at 0.45% among
  close contacts and 10.5% among household members. ⚔ Here a [critical
  look](https://twitter.com/AdamJKucharski/status/1235124770896826369)
  at these figures by epidemiologist Adam Kucharski.

* [A discussion in *Science*
  Magazine](https://www.sciencemag.org/news/2020/03/china-s-aggressive-measures-have-slowed-coronavirus-they-may-not-work-other-countries)
  (2020-03-02; [Twitter
  thread](https://twitter.com/kakape/status/1234603592407044096)) on
  [the WHO
  report](https://www.who.int/docs/default-source/coronaviruse/who-china-joint-mission-on-covid-19-final-report.pdf)
  (released 2020-02-28) on the joint WHO-Chinese mission led by Bruce
  Aylard to study the state of the epidemic in China; key message: the
  measures taken by Chinese authorities to contain the epidemic
  worked, but unclear what will happen in the long run or whether they
  can be applied in other countries.

* [A fairly detailed FAQ
  video](https://www.youtube.com/watch?v=oA8XYSftmtQ) \[[index of
  questions at
  1′10″](https://www.youtube.com/watch?v=oA8XYSftmtQ#t=1m10s)\]
  uploaded on 2020-03-03 by [Inés
  Dawson](https://twitter.com/InesLauraDawson).  *\[TODO: write some
  kind of summary here.\]*

* [Simulation of the effect of extra
  hand-washing](https://twitter.com/FryRsquared/status/1234491912775782400)
  on the spread of an epidemic (a simulation performed in 2018,
  retweeted on 2020-03-02); key message: it really has an impact, not
  just on the speed of progression but also on the final attack rate.

* Two hour-long live interviews \[in French\] by Brut: [Arnaud
  Fontanet (epidemiologist at the Institut
  Pasteur)](https://www.youtube.com/watch?v=vs2oyLSlo0Q) on
  2020-02-26, and [Éric Caumes (head of the department of infectious
  diseases at the Pitié hospital in
  Paris)](https://www.youtube.com/watch?v=L5thFsjoHok) on 2020-02-28.
  *\[I didn't have time to watch.\]*

* [Twitter Q&A
  thread](https://twitter.com/MackayIM/status/1233509962292375559) by
  virologist [Ian M. Mackay](https://virologydownunder.com/) on
  2020-02-28; discusses, inter alia, reinfection
  ([here](https://twitter.com/MackayIM/status/1233512522168356864),
  [here](https://twitter.com/MackayIM/status/1233512323358363654) and
  [here](https://twitter.com/MackayIM/status/1233511497017561090);
  seems to think false recovery is more likely than reinfection),
  [attack
  rate](https://twitter.com/MackayIM/status/1233511899083530240)
  (thinks 70% is probably overestimated), [virus
  lifetime](https://twitter.com/MackayIM/status/1233522944137187329),
  [fatality rate in
  Italy](https://twitter.com/MackayIM/status/1233521001578803200)
  (probably seems high because of observation bias) and more.

* [A discussion of seasonality of SARS-CoV-2 by epidemiologist Marc
  Lipsitch](https://docs.google.com/document/d/17mWPx-HTE1F2RKkbJlt4VkSYaznUiJgt21nuvmu51Kc)
  \[date≤2020-02-26\]; summary: despite seasonality of related
  viruses, it probably won't go away on its own in the summer.

* [A primer for the general public on virus
  mutation](https://ccdd.hsph.harvard.edu/mutation-adaptation-and-virus-genomes-a-primer-for-the-public/)
  \[date≤2020-02-26\]; main message is that we don't know much about
  mutations of this particular virus, but mutations aren't
  particularly scary in and of themselves.

* [Interview of Éric Caumes (head of the department of infectious
  diseases at the Pitié hospital in
  Paris)](https://www.jim.fr/e-docs/covid_19_la_riposte_est_elle_plus_redoutable_que_le_virus__181852/document_jim_tube.phtml)
  on 2020-02-25 \[in French\], discussing various issues
  (contagiousness, attack rate, fatality rate, mutation rate, etc.);
  main message seems to be that we are overreacting.

* [Thread by epidemiologist Marc
  Lipsitch](https://threadreaderapp.com/thread/1231425805898657795.html)
  on 2020-02-23 ([Twitter
  link](https://twitter.com/mlipsitch/status/1231425805898657795)),
  discussing the possibility and effectiveness of (temporary vs
  long-term) countermeasures (case-based containment vs lockdowns,
  etc.); expresses skepticism as to effectiveness of Chinese lockdowns
  (and reliability of reported figures).

* [What we have learnt as of 2020-02-20, MOOC by epidemiologist Arnaud
  Fontanet for the Institut
  Pasteur](https://www.youtube.com/watch?v=4l_NxT9XJHk); summarizes
  main information as of this date.  *\[TODO: write better summary
  here.\]*

* [Thread by epidemiologist Marc
  Lipsitch](https://threadreaderapp.com/thread/1228373884027592704.html)
  on 2020-02-14 ([Twitter
  link](https://twitter.com/mlipsitch/status/1228373884027592704)),
  discussing attack rate (=cumulated infection rate) r and the
  estimation that 40%≲r≲70% “in a situation without effective
  controls” based on comparison with similar epidemics.

* [Epidemiological characteristics report published in *China CDC
  Weekly*](http://weekly.chinacdc.cn/fileCCDCW/journal/article/ccdcw/newcreate/COVID-19.pdf)
  \[[mirror](https://github.com/cmrivers/ncov/blob/master/COVID-19.pdf)\]
  detailing breakdown of cases and statistics up to 2020-02-11 (72 314
  cases).

## Not Covid-19 specific but still relevant ##

* Definition of [morbidity frequency
  measures](https://www.cdc.gov/csels/dsepd/ss1978/lesson3/section2.html)
  and [mortality frequency
  measures](https://www.cdc.gov/csels/dsepd/ss1978/lesson3/section3.html)
  from (online version of) the CDC's book *Principles of Epidemiology
  in Public Health Practice*: explains definitions of “attack rate”,
  “secondary attack rate”, “case-fatality rate”, etc.

* Wikipedia page about [compartmental models in
  epidemiology](https://en.wikipedia.org/wiki/Compartmental_models_in_epidemiology)
  such as the SIR model.