Would ID₅₀ and LD₅₀ Necessarily Be the Same for a Given

question 130

Multiple Choice

Would ID₅₀ and LD₅₀ necessarily be the same for a given virus? Why or why not?

• A) Yes, because the number of viruses that infect 50% of a test population should also kill 50% of that test population.
• B) No, because a virus may be highly infectious (very low ID₅₀ value) but only marginally lethal (very high LD₅₀ value). A prime example of this is the rhinovirus (common cold virus).
• C) No, because very few viruses are lethal, yet many are highly infectious. The 2 values should ALWAYS be different.
• D) Yes, because what we're actually describing here is infection/killing of individual CELLS, not of entire organisms. If a cell is infected, it will always be killed.

---

Definitions:

Security Prices

The market value for tradable financial instruments such as stocks, bonds, and derivatives at any given time.

Efficient-Market Hypothesis

The theory that all available information is already reflected in securities prices, therefore making it impossible to consistently achieve higher returns than the overall market.

Security Prices

The market price at which a financial security is traded.

Risk Level

The degree of uncertainty associated with the potential for loss or undesirable outcomes in an activity or decision.