public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(PRESSED(KEY_FIRE)) {
        if(GetPlayerWeapon(playerid) == 4) {
            new
                Float:X,
                Float:Y,
                Float:Z;
            GetPlayerPos(playerid, X, Y, Z);
            foreach(Player, i)
            {
                if ( gTeam [ playerid ] != gTeam [ i ] )
                {
                    if(IsPlayerInRangeOfPoint(playerid, 2.0, X, Y, Z))
                    {
						Infected(i);
                        new Float:NewHP;
						GetPlayerArmour(playerid,NewHP);
						if(NewHP < OldHP[playerid])
						{
							Arena[ZombiesKills] ++;
    						switch(Arena[ZombiesKills])
							{
	   							case 5: GameTextForAll("~r~HUMAN SCORE: 5",4000,4);
	 							case 10: GameTextForAll("~r~HUMAN SCORE: 10",4000,4);
					    		case 15: GameTextForAll("~r~HUMAN SCORE: 15",4000,4);
					    		case 20: GameTextForAll("~r~HUMAN SCORE: 20",4000,4);
					    		case 25: GameTextForAll("~r~HUMAN SCORE: 25",4000,4);
			   				 	case 30: GameTextForAll("~r~HUMAN SCORE: 30",4000,4);
						    	case 35: GameTextForAll("~r~HUMAN SCORE: 35",4000,4);
					    		case 40: GameTextForAll("~r~HUMAN SCORE: 40",4000,4);
					    		case 45: GameTextForAll("~r~HUMAN SCORE: 45",4000,4);
			   				 	case 50:
								{
									GameTextForAll("~r~HUMAN SCORE: 50 ~n~~w~CHANGING MAP",4000,4);
									AnnounceWinner();
								}
							}
						}
                    }
                }
            }
        }
	}
    return 1;
}