You will be infected by something called the Beserk Dragon Virus in Monster Hunter 4, the sequel to the Wii classic which is only playable on 3DS
This Beserk Dragon virus, then. It infects you if you are close to a Tigrex who has already been infected and when attacked by this beast, the power gauge will increase. As for your own gauge, that will appear beneath your name and will cause the Beserk Dragon illness to break out.
You can stop it by attacking Tigrex before the gauge appears. And if you do manage to remove the virus, your weapons hit ratio increases.
Finally, we have news of the Gore Magala, a moth powder that sticks to you and makes the Gore Magala detect you.
Monster Hunter 4 will be released in Japan in March 2013. We'll be getting Monster Hunter 3: Ultimate Edition in the UK in Spring 2013.
[ Source: NeoGaf ]