What Is Incorrect About Pertussis

question 45

Multiple Choice

What is incorrect about pertussis?

• A)A virulence factor of B.pertussis is toxins that destroy cilia cells is produced.
• B)The source of infection is direct contact with inhaled droplets.
• C)The paroxysmal stage is characterized by persistent coughing.
• D)The number of cases is steadily decreasing since 1976.
• E)It can cause severe, life-threatening complications in babies.

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Definitions:

Marginal Costs

The increase in cost resulting from the manufacture of one additional unit of a good or service.

Decreasing Costs

Situations in which costs diminish as the level of production or scale of operations increases.

Efficiency

The extent to which time, effort, or cost is well-used for the intended task or purpose.

Total Cost Function

An equation that represents the total cost incurred by a firm in the production of goods or services, as a function of output level.