sources

{
    "link": "http://www.who.int/immunization/monitoring_surveillance/data/en/ and https://extranet.who.int/polis/public/CaseCount.aspx",
    "retrievedDate": "5 February 2018",
    "additionalInfo": "For the estimated number of polio cases using Tebbens et al.\u2019s 2010 model:\r\nThe WHO\u2019s dataset of reported polio cases from 1980 onwards (the first link above) is used to produce an estimate of the actual number of polio cases. An explanation of the correction factor algorithm can be found here: https://ourworldindata.org/tebbens-et-al-2011-estimation-of-the-number-of-paralytic-polio-cases/ Part of the model input consists of the WHO\u2019s surveillance system that can be found under the second link cited above. \r\n\r\n\r\nFor the estimated number of polio cases that disregard any reported cases after a country was certified polio-free and use Tebbens et al.\u2019s (2010) model: \r\nThe WHO\u2019s dataset from 1980 onwards (the first link above) was modified by deleting all documented polio cases after the year in which polio ceased to be endemic in each country (see map and data here: https://ourworldindata.org/grapher/the-decade-of-the-last-recorded-case-of-paralytic-polio-by-country). Then, Tebbens et al.\u2019s  (2010) model is applied in the same way as for the \u201cEstimated number of polio cases\u201d, for which we provide an explanation here: https://ourworldindata.org/tebbens-et-al-2011-estimation-of-the-number-of-paralytic-polio-cases/.",
    "dataPublishedBy": "Our World in Data based on World Health Organization (2018) and Tebbens et al. (2010)",
    "dataPublisherSource": "WHO collects data through own surveillance system"
}