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. 2011 Dec 15;25(2):400–424. doi: 10.1093/shm/hkr162

Fig. 6.

Fig. 6

To Illustrate ‘The Filter Passer of Influenza’. Photomicrograph taken for M. H. Gordon by J. E. Barnard at the NIMR in early 1922, of a film of Gordon's filter-passer grown ‘in pure culture’ in Noguchi medium.

Source: Gordon 1922, p. 11.