Here's more then you'll ever want to know about microbes and antimicrobials:

http://www.answers.com/topic/antimicrobial

It seems like a no brainer that the Dr. is refering to H&N RT since it's a sinus issue. Even RT scatter will affect the sinuses to some degree. But the definition of nasopharyngeal should clarify it.

http://www.cancer.gov/cancertopics/pdq/treatment/nasopharyngeal/Patient


Gary Allsebrook
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Dx 11/22/02, SCC, 6 x 3 cm Polypoid tumor, rt tonsil, Stage III/IVA, T3N0M0 G1/2
Tx 1/28/03 - 3/19/03, Cisplatin ct x2, IMRT, bilateral, with boost, x35(69.96Gy)
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"You are a mist that appears for a little while and then vanishes" (James 4:14 NIV)