Which of the following displays the time course of a disease outbreak?     Clustering     Cyclic trend     Epidemic curve     Secular trend

Diseases that primarily exist in animals, but may be transmitted to humans are called parasitic symbiotic zoonotic chronic

Why B is correct

Which of the following is generally transmitted "direct"ly from a reservoir of the infection to a human being? -Hepatitis B -infestation - colonization  -parasitism  - contamination

Q4. Epidemic threshold is described as: the maximum number of deaths that would suggest an epidemic was underway the minimum number of deaths that would suggest an epidemic was underway the minimum number of deaths that would suggest the epidemic was receding the minimum number of deaths that would support the conclusion that epidemic was over

Some living things exist in a very close relationship which benefits one organism but does not hurt the other organism this type of relationship is called

Plague has about 5-10 cases in the United States each year. This is an example of a(n) disease. O Epidemic Sporadic O Pandemic O Endemic

Number of cases 30,000 OOO 25,000 20,000 15,000 10,000 5,000 Reported TB Cases and Rates United States, 1993-2019 Number of cases --Incidence rate 0 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 2017 2019 Year 2 90 Cases per 100,000 persons The graph above shows tuberculosis cases by year in the U.S. This graph is an example of a(n): Clustering Cyclic trend Epidemic curve Secular trend

Flagellate protozoans live in the guts of termites. The flagellates break down the cellulose that the termites eat, and both organisms benefit from the resulting nutrients. This relationship between protozoan and termite is an example of- mutualism parasitism equilibrium commensalism

A measure of disease burden is