A City Guide To Huoqiu Chengguanzhen for Both the health-risk behaviour described here and the health-enhancing behaviour described in Chapter provide the impetus for many educational and public health initiatives worldwide. behavioural pathogen a behavioural practice thought to be damaging to health, e.g. smoking. behavioural immunogen a behavioural practice considered to be healthprotective, e.g. exercise. A City Guide To Huoqiu Chengguanzhen 2016.