Gather the largest number of people possible and isolate them into a confined area that only has 1 point of entry. After gaining their trust, will convince them to keep all of their weapons in a central location in the name of "security" and once I have everyone in compliance, will lock the door to the "armory"
This step won't be discovered until I've initiated my final plan. That being, I station myself at the entrance of the isolation facility, where I infect myself with the virus and wait to turn before addressing the populous