What Is Considered the Second Link in the Chain of Infection

question 23

Multiple Choice

What is considered the second link in the chain of infection?

• A) Infectious agent
• B) Reservoir
• C) Susceptible host
• D) Portal

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Definitions:

Environmental Change

Any alteration in the conditions of an environment, due to natural processes or human activities, that can affect the organisms living within it.

Hardy-Weinberg Equilibrium

A rule that indicates the frequencies of alleles and genotypes in a population will stay unchanged over generations if there are no other factors driving evolution.

Allele Frequencies

The relative frequency of different variants (alleles) of a particular gene in a population, which can change over time due to various evolutionary pressures.

Genotype Distribution

The frequency and arrangement of genetic variations and alleles in a population.