Answer to Question 1
D
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A Incorrect. A vector is not best described as the point at which an infection entering the body intersects with an infection leaving the body.
B Incorrect. A vector is not best described as the area of initial bite or contact by the disease-bearing animal or insect.
C Incorrect. A vector is not best described as a person or animal who is infected with an organism but does not have the disease.
D Correct. A vector is best described as an animal or insect that carries the infectious organism from one host to another.
Answer to Question 2
A
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A Correct. The reservoir, one of six factors in the chain of infection, is best described as living and nonliving places there pathogens can survive without multiplication.
B Incorrect. The reservoir, one of six factors in the chain of infection, is not best described as a pool of water there mosquitoes can breed and thus more quickly spread infection.
C Incorrect. The reservoir, one of six factors in the chain of infection, is not best described as the stomach, which holds a large number of pathogens for a significant amount of time.
D Incorrect. The reservoir, one of six factors in the chain of infection, is not best described as any area there a stable amount of water is present.
The general pattern of progression of an untreated HIV infection
Electron micrograph of phage infection
Chain of Infection
A point-type ignition system showing the distributor cam which opens the points
Find the magnitude and the direction of the resultant vector of the two vectors below:
Vector has a magnitude of 5.5 cm and points along the x-axis. Vector has a magnitude of ...