No weaponized units, no wars, no addictive elements - we have an utterly absurd number of advantages to offer humans without needing to make more, and we're currently safe and sound with the military just thinking of us as a cold. There will be plenty who will join of their own volition, more and more so if we continue to be nothing but a boon.
Keep the Honey campaign going, provide free samples at the Beekeeper convention - this should increase their level of infection and give us good PR among the group as a whole.
Devote a total of 20 infected to research, no more. 20 is a number low enough to not draw attention, while providing a fast rate of research even with the large number of projects we're currently running simultaneously. That said, do not add any new research projects this cycle, but begin compiling a psychological profile on MAYOR BLOOMBERG, with a focus on potential use as an ally and/or willing host.
Continue to infect airports, begin spreading along mass transit routes connected to those airports - bus routes, train lines, etc. Have we gotten Grand Central Station yet? If so, start infecting the railway network.