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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 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"))