FluView

This is the documentation of the API for accessing the FluView (fluview) data source of the Delphi’s epidemiological data.

General topics not specific to any particular data source are discussed in the API overview. Such topics include: contributing, citing, and data licensing.

FluView Data

Influenza-like illness (ILI) from U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet).

Data source: United States Centers for Disease Control and Prevention (CDC)
Temporal Resolution: Weekly* from 1997w40
Spatial Resolution: National, HHS regions, Census divisions, most States and Territories, and some Cities (full list here)
Open access

* Data is usually released on Friday

The API

The base URL is: https://delphi.cmu.edu/epidata/api.php

See this documentation for details on specifying epiweeks, dates, and lists.

Parameters

Required

Parameter	Description	Type
`epiweeks`	epiweeks	`list` of epiweeks
`regions`	regions	`list` of region labels

Optional

Parameter	Description	Type
`issues`	issues	`list` of epiweeks
`lag`	# weeks between each epiweek and its issue	integer
`auth`	password for private imputed data	string

Notes:

If both issues and lag are specified, only issues is used. If neither is specified, the current issues are used.

Response

Field	Description	Type
`result`	result code: 1 = success, 2 = too many results, -2 = no results	integer
`epidata`	list of results	array of objects
`epidata[].release_date`		string or null
`epidata[].region`		string
`epidata[].issue`		integer
`epidata[].epiweek`		integer
`epidata[].lag`		integer
`epidata[].num_ili`		integer
`epidata[].num_patients`		integer
`epidata[].num_providers`		integer
`epidata[].num_age_0`		integer or null
`epidata[].num_age_1`		integer or null
`epidata[].num_age_2`		integer or null
`epidata[].num_age_3`		integer or null
`epidata[].num_age_4`		integer or null
`epidata[].num_age_5`		integer or null
`epidata[].wili`	weighted percent influenza-like illness	float
`epidata[].ili`	percent influenza-like illness	float
`message`	`success` or error message	string

Notes:

If authorized via auth, private data is not included.

Example URLs

FluView on 2015w01 (national)

https://delphi.cmu.edu/epidata/api.php?source=fluview&regions=nat&epiweeks=201501

{
  "result": 1,
  "epidata": [
    {
      "release_date": "2017-10-24",
      "region": "nat",
      "issue": 201740,
      "epiweek": 201501,
      "lag": 143,
      "num_ili": 31483,
      "num_patients": 771835,
      "num_providers": 1958,
      "num_age_0": 7160,
      "num_age_1": 9589,
      "num_age_2": null,
      "num_age_3": 8072,
      "num_age_4": 3614,
      "num_age_5": 3048,
      "wili": 4.21374,
      "ili": 4.07898
    }
  ],
  "message": "success"
}

FluView in HHS Regions 4 and 6 for the 2014/2015 flu season

https://delphi.cmu.edu/epidata/api.php?source=fluview&regions=hhs4,hhs6&epiweeks=201440-201520

Updates to FluView on 2014w53, reported from 2015w01 through 2015w10 (national)

https://delphi.cmu.edu/epidata/api.php?source=fluview&regions=nat&epiweeks=201453&issues=201501-201510

Code Samples

Libraries are available for CoffeeScript, JavaScript, Python, and R. The following samples show how to import the library and fetch national FluView data for epiweeks 201440 and 201501-201510 (11 weeks total).

CoffeeScript (in Node.js)

# Import
{Epidata} = require('./delphi_epidata')
# Fetch data
callback = (result, message, epidata) ->
  console.log(result, message, epidata?.length)
Epidata.fluview(callback, ['nat'], [201440, Epidata.range(201501, 201510)])

JavaScript (in a web browser)

<!-- Imports -->
<script src="jquery.js"></script>
<script src="delphi_epidata.js"></script>
<!-- Fetch data -->
<script>
  var callback = function(result, message, epidata) {
    console.log(result, message, epidata != null ? epidata.length : void 0);
  };
  Epidata.fluview(callback, ['nat'], [201440, Epidata.range(201501, 201510)]);
</script>

Python

Optionally install the package using pip(env):

pip install delphi-epidata

Otherwise, place delphi_epidata.py from this repo next to your python script.

# Import
from delphi_epidata import Epidata
# Fetch data
res = Epidata.fluview(['nat'], [201440, Epidata.range(201501, 201510)])
print(res['result'], res['message'], len(res['epidata']))

R

# Import
source('delphi_epidata.R')
# Fetch data
res <- Epidata$fluview(list('nat'), list(201440, Epidata$range(201501, 201510)))
cat(paste(res$result, res$message, length(res$epidata), "\n"))