The World Epidemiological Record (WER) for 27 November 2009, vol. 84, 48 (pp 493–504) includes: WHO external quality assessment project for detecting influenza virus subtype A by polymerase chain reaction – summary analysis, 2009; Performance of acute flaccid paralysis (AFP) surveillance and incidence of poliomyelitis, 2009

http://www.who.int/wer/2009/wer8448.pdf