Salmonella and all active food pathogens stop growing around 125° and are killed in around 3 minutes at 150°F, +/- 5° Botulinum Spores can survive temps up to about 250°F hence the use of Nitrite Cure to kill them before we even start smoking. It is important to smoke sausage to a safe IT, as above, to kill any bacteria the first time heat is applied. We don't partially cook meat and freeze it. This is because surviving bacteria will begin to multiply again as the sausage cools, some making heat stable toxins, go dormant in the freezer, then multiply more during defrosting with more toxin. Additionally with repeated heating and cooling bacteria can develop a tolerance for temps that would otherwise inhibit it's growth or kill it. So for these reasons Partial Cooking is risky business...JJ