Explanation:

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Allosteric protein
Allosteric protein can be defined as a protein with a
multiple ligand- binding site that changes from one folding conformation to a
different shape when another molecules binds to it. However, the conformational
changes alter the properties or activities of the protein.
Answer:
Vaccinations
Explanation:
For example, if a disease has an R0 of 18, a person who has the disease will transmit it to an average of 18 other people. That replication will continue if no one has been vaccinated against the disease or is already immune to it in their community. So if you have (for example) a vaccination then you're less likely to get it, resulting in a lower R0