Iodine is too reactive to be in nature as an element. Iodine compounds are not common in the ground. There is a mineral called caliche that is found in dry deserts. It has iodate in it. Iodide is found in seawater. Kelp has quite large amounts of iodine in it. Iodine is one of the heaviest elements needed by living things.
Azithromycin is effective for treating sinus infections caused by haemophilus influenzae, moraxella catarrhalis or streptococcus pneumoniae, according to the U.S. National Library of Medicine.
Azithromycin Dose Pack (azithromycin): It has NEVER worked for a sinus infection. I just finished 2 of the 5 day dose packs and 3 days later has a fever of 102 with a massive infection still raging..