Which of the Following Statements About the Weil-Felix Test for Typhus

question 9

Multiple Choice

Which of the following statements about the Weil-Felix test for typhus is false?

• A) It relies on the fact that antibodies generated against Rickettsia do not react with Proteus OX19.
• B) It relies on cross-reactivity between the pathogen and the soil bacterium.
• C) When blood serum is drawn from a person to be tested, the serum is mixed with a solution containing Proteus OX19.
• D) Humans are not normally infected with Proteus OX19.
• E) If the individual being tested is positive, clumping will be seen on the test slide.

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Definitions:

Rate of Return

The gain or loss of an investment over a specified period, expressed as a percentage of the investment's initial cost.

Net Present Value

A calculation that compares the present value of a project’s cash inflows with the present value of its cash outflows, used in capital budgeting to assess profitability.

Payback Period

The length of time required to recoup the initial investment in a project, ignoring the time value of money.

Capital Investment

Funds invested in a business with the aim of furthering its business objectives, such as purchasing assets or funding new growth initiatives.