Reply #2: Yeah, in the article it actually talks about that -

[TBF]

"And of course, people fly, too. Dr. Silbergeld thinks that human travel is the most likely way that Eurasian swine viral components made their way to Mexico. "A tourist from China could have gone to Mexico City, and that Asian strain was picked up by somebody else, who then went to a swine barn," she suggested. "It's a likely explanation. Sometimes we overestimate what wild birds can do."

Still, not a bad time to go vegan if you haven't already.