Earlier quoted context omitted.
I added a safety section. YouTube generally isn't considered a reliable source for Wikipedia but I think they make exceptions sometimes. If not, hopefully someone will complain and add info from a more reliable source. PS: I can't wait to check back tomorrow and see how being at the top of HN impacted the page views. Interesting that it had a small bump in views on Tuesday (probably posted/mentioned somehwere popular…
Well it looks like the salmon needs to be above 63C for 15 seconds to kill the bacteria, and eaten soon after cooking to mitigate bacteria spores that may grow days after. That's what she says in the video anyway, but I can't find a source for that, might be worth adding to wikipida? Hey if it stops a few people getting ill then it's worth it.
I guess if you like overcooked salmon.
Food safe temperatures aren't a hard line. Bacteria die off at much lower temperatures than 65ºC (from around 54ºC). What does change with temperature is the rate at which bacteria die. The usual safety goal is to get a 6.5 log10 reduction in bacteria.
The reason that 65ºC is usually chosen as a safe temperature is because once you reach that temperature the time to reach that reduction is very short (about 1.5minutes), at 70ºC it's instantaneous.
At lower temperatures, you have to keep the food at that temperature for a longer amount of time (there are reference charts to be found online[1]). For this to be safe you have to be able to measure and/or control the temperature reliably. This is obviously more difficult to do than just cooking to a specific temperature. In many commercial applications it's just easier to cook to a high enough temperature to not have to worry about it.
There are also other ways to kill the bacteria. I usually cure salmon overnight in the fridge (2:1 ratio brown sugar and salt) before smoking it to 54ºC. The temperature doesn't kill the bacteria but the curing does.
[1] https://www.fsis.usda.gov/sites/default/files/media_file/202...