Chapter 1 What’s New for FortiOS 5.2.1 : Security Profiles : Menu and Options Simplification : AntiVirus : Flow-based Profile Options
  
Flow-based Profile Options
If flow-based inspection is used for AntiVirus, the only additional options that can be configured in the web-based manager are for what actions will be taken for detected viruses and connections to Botnet C&C servers. Detect Viruses can be set to either Block or Monitor. These same two options are available for Botnet C&C servers, if detection is enabled.
Figure 21: Flow-based options for AntiVirus