if(gTeam[killerid] == TEAM_ZOMBIE)
{
   gTeam[playerid] = TEAM_ZOMBIE;  
   GameTextForPlayer(playerid,"~y~Infected",3000,4);
   SendClientMessage(playerid,COLOR_RED,"You have been infected by a zombie, You're now one of them");
   return 1;
}

new Infected[MAX_PLAYERS];

public OnPlayerConnect(playerid)
{
Infected[playerid] = 0;
return 1;
}

public OnPlayerDeath(playerid, killerid, reason)
{
if(gTeam[killerid] == ZOMBIE)
{
Infected[playerid] = 1;
ForceClassSelection(playerid);
}
return 1;
}

public OnPlayerSpawn(playerid)
{
if(Infected[playerid] == 1)
{
gTeam[playerid] = ZOMBIE;
Infected[playerid] = 0;
SpawnPlayer(playerid); //it is to set his skin and spawn..
}
return 1;
}