Talk:The Infected/@comment-108.71.37.161-20140304021027/@comment-4632427-20140308072217

It's been standard for a long time now (almost a year?) for Infected to occasionally appear on the World Map. I seem to get Infected instead of mammoths for about 1 group in 10, maybe slightly more. They do drop Black Nanos, but at a lower rate than during the event. If you frequently clear all of the encounters on your World Map, you might be able to get enough Black Nanos to infect a unit once every few weeks.

That's assuming you built the Infection Test Facility during the event, of course. If not, you have to wait for next Halloween to build one.