Within Six Months of Effectively Using Methicillin to Treat S

question 2

Multiple Choice

Within six months of effectively using methicillin to treat S. aureus infections in a community, all new S. aureus infections were caused by MRSA. How can this best be explained?

• A) A patient must have become infected with MRSA from another community.
• B) In response to the drug, S. aureus began making drug-resistant versions of the protein targeted by the drug.
• C) Some drug-resistant bacteria were present at the start of treatment, and natural selection increased their frequency.
• D) S. aureus evolved to resist vaccines.

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Definitions:

Variable Costing Income Statement

An income statement format that only includes variable costs as cost of goods sold and uses contribution margin to analyze profitability.

Absorption Costing Format

An accounting method that includes all manufacturing costs - direct materials, direct labor, and both variable and fixed manufacturing overhead - in the cost of a product.

Gross Margin

Gross margin is a company's net sales revenue minus its cost of goods sold, representing the efficiency of a company in managing its direct costs.

Absorption Costing

An accounting method that includes all direct and indirect manufacturing costs in the cost of a product.