Community a Receives Its Water from Several Sources

question 25

Multiple Choice

Community A receives its water from several sources. The water source responsible for causing an outbreak of disease X is unknown. The best evidence to determine which suspected water supply is responsible would be:

• A) the identity of the water supply providing water to the largest proportion of cases.
• B) the relationship between quantity of water consumed and the severity of attack for each individual.
• C) the identity of the water supply that has the greatest opportunity for contamination during the epidemic.
• D) the attack rates for disease X in those who did and did not drink from each water supply.

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Definitions:

OEM

Original Equipment Manufacturer, a company that produces parts and equipment that may be marketed by another manufacturer.

Shift Rail Detent

A mechanism in manual transmissions that helps hold a gear in place once it has been selected.

Detent Lug

A mechanical feature designed to prevent or restrict movement until an opposing force is applied, often used in gear selection.

Multiple Countershaft Transmission

A transmission design that features more than one countershaft, allowing for improved torque distribution and selection of gear ratios.