Any raw food you can eat will be a good step in the right direction. Most pathogenic bacteria come from cooked foods, as all the beneficial, naturally occurring bacteria are killed, allowing pathogens to grow unchecked. Raw meats that are raised and processed in poor conditions are the real problem, if there is salmonella, campylobacter or E. coli. If you find a reputable, non-industrial source, there probably would not be any problem.
Healthy people have more bacteria in their guts than cells in their bodies. That said, if you are worried about pathogens in raw foods, marinating in an acid or salt will probably take care of anything. Sally Fallon says fish parasites can be killed by marinating in acid (like lemon juice), but I have never confirmed this. You may want to eat some lacto-fermented food with your meat to ensure you have some probiotic bacteria too. They tend to keep any pathogens in check, by competing with them.
Searing is certainly better than cooking something well done.