CHN-I-EPIDEMIOLOGY-UNIT -4 Principles of Epidemiology andEpidemiological methodsa) Definition and aims ofepidemiology, communicable andnon-communicable diseases.b) Basic tools of measurement inepidemiologyc) Uses of epidemiologyd) Disease cyclee) Spectrum of diseasef) Levels of prevention of disease.g) Disease transmission – direct andindirect.h) Immunizing agents, immunizationand national immunizationschedule.i) Control of infectious diseases.j) Disinfection. Epidemiology (એપીડેમીયોલોજી): Key Terms (કી ટર્મ્સ) : Epidemiology (એપીડેમીયોલોજી): Incubation period (ઇનક્યુબેશન પિરીયડ) : Epidemic (એપીડેમીક): Endemic (એન્ડેમિક) : Sporadic (સ્પોરાડીક): Pandemic (પેન્ડેમીક)