Salad packaged with raw meat: is it safe?
What you're looking at is called (in the US) "cross contamination". You have a food generally considered "unsafe" (beef) that is coming into contact with a food generally considered "safe" (salad greens).

This contact makes the greens "unsafe" to consume raw.


  Cross-contamination is the transfer of harmful bacteria to food from other foods, cutting boards, utensils, etc., if they are not handled properly. This is especially true when handling raw meat, poultry, and seafood, so keep these foods and their juices away from already cooked or ready-to-eat foods and fresh produce.


The rule in the US is to always keep these products away from each other so that the "safe" foods stay safe.

The only way to make the greens safe to eat is to cook them, thereby killing off the bacteria that may have been transferred to them in the juices of the meat.