Jumping into the conversation: I am 100% with you on avoiding IVM for prophylaxis. Vitamins D and C + zinc work with our own mucosal immune system, minimize oxidative stress damage and support enzymatic processes. Topical use of Povidone-iodine or hydrogen peroxide seem to kill the virus in the nose, mouth and throat by disruption of the outer membrane of the bug, which should not lead to development of resistance. N-cetylpyridinium chloride (“Scope”) also disrupts the virus outer shell.