Notes
Address correspondence to: Chris Wilson, c/o School of Humanities, Faculty of Arts, Education, and Social Science, University of Western Sydney, Locked Bag 1797, South Penrith Distribution Centre, NSW 1797, Australia, E‐mail: [email protected]
PPD stands for purified protein derivative and is a constituent of the Mantoux test used to test for ‘cellular immune responses to Mucobacterium bovis (Tuberculin bacillus), incurred either naturally or via BCG vaccine’ (Citation Immunisation Procedures, NHMRC, 1991, p.110). PPD is not strictly a vaccine but is used to see whether it is necessary to use a vaccine (WS 422).