Weekly Epidemiological Record (WER)

Weekly Epidemiological Record, 14 September 2018, vol. 93, 37 (pp. 477–488)

477 Widespread transmission of circulating vaccine-derived poliovirus identified by environmental surveillance and immunization response, Horn of Africa, 2017–2018
480 Isolation and identification of human influenza viruses in cell culture: summary analysis of the WHO external quality assessment programme for National Influenza Centres in the WHO regions of the Americas, Africa and Eastern Mediterranean, 2017

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