The period preliminary to the onset of disease in man,when the disease agent has not yet entered man but thefactors favouring its interaction with human host existin the environment is known as

When the infectious agent can be transmitted from an infected host to a new host, a disease is described as .

The emphasis of epidemiology was on noninfectious disease first then spread to infectious diseasesQuestion 6AnswerFalseTrue

In the second half of the twentieth century to-date a shift has occurred from acute infectious disease to rampant chronic non-infectious, degenerative diseases. Citing specific examples of the latter health disorders, elaborate on how the latter group of diseases are associated with human nutrition, physical activity levels, aging and environmental pollution.

From what we have seen and read, the actual origins of communicable diseases (such as HIV) have little connection to patterns of human habitation and social organization.Group of answer choicesTrueFalse

Introduced disease-causing organisms are especially dangerous to new environments because they can destroy the non-native host. This happens because the disease-causing organismsMultiple Choicehave not evolved with this host to achieve the normal balance for long-term survival.are opportunists and in order to survive must out-compete all other species.are specialists and destroy the individual organisms that have not developed resistance.do not have natural predators.are generalists and highly competitive.