If you wanted to tell a co-worker to give a patient medication as needed, you could use this abbreviation. ASPA PRN

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answer: although many types of viruses can cause a common cold, rhinoviruses are the most common culprit. a cold virus enters your body through your mouth, eyes or nose. the virus can spread through droplets in the air when someone who is sick coughs, sneezes or talks. theres your answer

explanation:

you should wear a lead protective shield when having teeth x-rays

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-lavira : )