On Mon, 31 Oct 2016, Janet wrote:

> In article >,
> says...
>>
>> If heating destroyed all the harmful bacteria, then it would also destroy
>> botulism...but it doesn't
>
> It does.
>
>> ...explain that.
>
> http://www.who.int/mediacentre/factsheets/fs270/en/

there's the bacterium, and then there's the toxin it produces, and of
note, if someone doesn't want to go to the factsheet, the bacteria grow in
low oxygen conditions as they are "anaerobes".