The reason why the pharmacist is concern because the antibiotic could be harmful to a child and it's best to check whether the prescription is for the mother. It is because the drug that is being prescribed could be toxic for a children when it is only a normal dosage for an adult. That is why a prescription is needed to assure that the drug is for the adult.
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I think what would effect how fast it spreads would be like how close they were and how they were spreading it to eachother would help determine that
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