PH.M4.Epidemiology

He defined epidemiology as "the field of science dealing with the relationship of the various factors which determines the frequencies and distributions of an infection process; a disease, or a physiologic state in a human community"

• Maxcy

• Frost

• Snow

• Koch

The science that studies when and where diseases occur and how they are transmitted in population.

• Epidemiology

• Pathology

• Prevalence

• Incidence

The scientific study of the disease.

• Epidemiology

• Pathology

• Prevalence

• Incidence

The fraction of the population having the disease at a specified time.

• Epidemiology

• Pathology

• Prevalence

• Incidence

The fraction of the population that contracts the disease during a particular period.

• Epidemiology

• Pathology

• Prevalence

• Incidence

Particular serotypes, or strains, of a species.

• Agent factors

• Host factors

• Environmental factors

an organism can be encapsulated and unencapsulated strains

• Agent factors

• Host factors

• Environmental factors

Inoculum size or dose

• Agent factors

• Host factors

• Environmental factors

race ethnic origin

• Agent factors

• Host factors

• Environmental factors

lifestyle and diet

• Agent factors

• Host factors

• Environmental factors