I am sure other players have noticed an incredibly powerful combo with this card after the release of Contaminate. Click -> install Chakana. Click -> play Contaminate. Click -> ruin the Corp's day.
Maybe not the most powerful two card/two click combo... but no Corp player will feel good sacrificing an entire turn to purge the virus counters off there. Even if they do, you are always free to run R&D again and load it back up. You do want to run R&D, right?