FLU SEASON not a Mutation?

[MINKISS]

ok i had 4/6 mutation and just turned it on to get my 5th mutation whice this week is ful season but after i join played alittle and quit it still says 4/6 does flu season not count as a mutation?

[Treewaller]

Only the initial 20 mutations count, the 6 community mutations they've added since then were never added to the achievement requirements. That's also why the now-permanent Realism Versus still counts towards the achievement.

Here's the list of the original 20 and additional 6: http://left4dead.wikia.com/wiki/Mutations#Console_Commands

[SnakeEyes237]

Flu season counted on my ticker on the in game counter. It went up after playing a full campaign on flu season