list1 = ['Infections/O', 'with/O', 'Legionella/O', 'bacteria/O', 'can/O', 'cause/O', 'a/O', 'potentially/O', 'lethal/O', 'form/O', 'of/O', 'pneumonia/O', 'known/O', 'as/O', 'legionnaires/O', "'/O", 'disease/O', './O', 'In/O', '1999/O', 'a/O', 'major/O', 'outbreak/O', ',/O', 'causing/O', '31/O', 'deaths/O', ',/O', 'occurred/O', 'among/O', 'visitors/O', 'and/O', 'exhibitors/O', 'of/O', 'a/O', 'consumer/O', 'fair/O', 'in/O', 'The/O', 'Netherlands/O', './O', 'The/I', 'epidemiology/B', 'of/B', 'subclinical/B', 'infections/I', 'is/I', 'largely/I', 'unknown/I', ',/I', 'as/I', 'there/I', 'is/I', 'no/I', 'reliable/I', 'method/I', 'to/I', 'diagnose/I', 'such/I', 'infections/I', './O', 'To/O', 'explore/O', 'the/O', 'incidence/O', 'of/O', 'subclinical/O', 'infections/O', ',/O', 'IgG/O', 'and/O', 'IgM/O', 'antibody/O', 'levels/O', 'among/O', 'exhibitors/O', 'were/O', 'compared/O', 'to/O', 'those/O', 'among/O', 'a/O', 'representative/O', 'sample/O', 'of/O', 'the/O', 'Dutch/O', 'population/O', './O', 'As/O', 'exhibitors/O', 'were/O', 'assumed/O', 'to/O', 'comprise/O', 'both/O', 'infected/O', 'and/O', 'uninfected/O', 'individuals/O', ',/O', 'their/O', 'antibody/O', 'levels/O', 'were/O', 'modelled/O', 'as/O', 'a/O', 'mixture/O', 'distribution/O', './O', 'As/O', 'infected/O', 'individuals/O', 'are/O', 'expected/O', 'to/O', 'cluster/O', 'around/O', 'a/O', 'point/O', 'source/O', ',/O', 'the/O', 'spatial/O', 'aspect/O', 'of/O', 'the/O', 'spread/O', 'of/O', 'infections/O', 'was/O', 'taken/O', 'into/O', 'account/O', './O', 'To/O', 'estimate/O', 'the/O', 'distribution/O', 'of/O', 'antibody/O', 'levels/O', 'among/O', 'infected/O', 'individuals/O', 'and/O', 'to/O', 'impute/O', 'infection/O', 'status/O', 'among/O', 'exhibitors/O', ',/O', 'data/O', 'augmentation/O', 'was/O', 'used/O', './O', 'Subclinical/O', 'infection/O', 'appeared/O', 'to/O', 'be/O', 'very/O', 'common/O', 'and/O', 'its/O', 'frequency/O', 'declined/O', 'with/O', 'the/O', 'distance/O', 'from/O', 'the/O', 'putative/O', 'source/O', 'of/O', 'the/O', 'outbreak/O', './O', 'Copyright/O', '(/O', 'C/O', ')/O', '2003/O', 'John/O', 'Wiley/O', 'Sons/O', ',/O', 'Ltd./O']