If i buy the remede for zombie could i get a new infection?

The cure for this year's strains are not available yet. Dr Lockhart's stuff in the MC is not a cure, it just gives your HA a weird side effect for a bit.

Currently there is no cure for the virus. The potions Doctor Lockheart only affect the avatar by adding strange things. For example, my avatar has the pink swirls around it caused by [item=Dr. Lockhearts Amoricone].

He's such a snake-oil salesman. P:

That would disappear if i use the medecine?

If you take the medicine in the millionaire center, you will remain infected. There's no new cure for the strains yet. All you get is a weird effect to your HA for a little while. The medicine is a one time use.