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* Environment:
-physical(radiation,noise,temperature,pressure)
-mechanical(risk factors of work accidents)
-chemical(pneumoconiosis)
-water,air,food as vehicle of transmission

* General epidemiology:
VIP VIP VIP (disinfection is not included)


* Non communicable diseases:
VIP except liver ,kidney diseases

NB:the imp points in each disease: risk factors,levels of prevention