Final answer:
Desirable qualities in a germicide include broad-spectrum action, rapid action, and being non-corrosive and nonstaining. Intermediate-level germicides kill vegetative cells and certain enveloped viruses but not endospores. Phenol has historically been used as the standard for evaluating the effectiveness of disinfectants.
Step-by-step explanation:
Some desirable qualities in a germicide include broad-spectrum action, rapid action, and being not corrosive and nonstaining. Broad-spectrum action refers to the ability of a germicide to kill a wide range of microbes. Rapid action is important for a germicide to work quickly to reduce the chance of transmission or infection. Non-corrosive and nonstaining properties ensure that the germicide does not damage surfaces or leave marks, making it safe to use in a variety of settings.
Factors such as solubility in a solvent ensure that a germicide can be mixed and used effectively, while the ability to remain active in the presence of organic matter increases its efficacy during practical applications.
Intermediate-level germicides are those that can kill vegetative cells and certain enveloped viruses but are less effective against endospores and certain other viruses.
As referenced in historical comparisons, phenol has been an exemplary standard for assessing the efficacy of disinfectants through methods such as broth dilution or disk diffusion assays.