Having one example and phrasing it to sound like multiple is misleading, imo.
Sorry about that. It wasn't the point, as SARS is caused by many different strains of the same type of virus.
The first outbreak of SARS-CoV was identified in Foshan, Guangdong, China, in November 2002.
Thats almost 20 years ago.
Also Swine Infulenza does not originate from Mexico.
Swine flu has been around for much longer, at least for 100 years.