public OnPluginStart()
{
    HookEvent("tank_spawn", TankSpawned);
}

public Action:TankSpawned(Handle:event, const String:ename[], bool:dontBroadcast)
{

    int eblan = GetClientOfUserId(GetEventInt(event, "userid"));
    if(IsValidInfected(eblan))
    {
        CreateTimer(0.5, timer, eblan, TIMER_FLAG_NO_MAPCHANGE);
    }
}

public Action:timer(Handle timer, any client)
{
    if(IsValidInfected(client))
    {
        SetEntityHealth(client, GetRandomInt(1, 950000));
    }
}

stock bool:IsValidInfected( client )
{
    if ( client < 1 || client > MaxClients ) return false;
    if ( !IsClientConnected( client )) return false;
    if ( !IsClientInGame( client )) return false;
    if ( GetClientTeam( client ) != 3 ) return false;
    return true;
}