The chytrid fungus, Batrachochytrium dendrobatidis, is a pathogenic fungus that has severely impacted frog populations around the globe. If you were a scientist studying this fungus and wanted to know if it could infect a new frog species, how would you conduct your experiment? Given the following examples, which represent reasonable or logical control(s) or treatments(s), and which would likely be unnecessary and/or uninformative?
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control
uninformative
treatment
Frogs are exposed to frogs infected with B. dendrobatidis.
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Frogs are sprayed with B. dendrobatidis.
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Frogs are wiped with B. dendrobatidis.
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Frogs are wiped with sterile swabs.
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Frogs are wiped with the bacterium Bacillus subtilis.
control
Frogs are wiped with sterile swabs.
uninformative
Frogs are wiped with the bacterium Bacillus subtilis.
treatment
Frogs are exposed to frogs infected with B. dendrobatidis.
Frogs are sprayed with B. dendrobatidis.