The article from http://www.timesonline.co.uk doesn't explain what they mean by "protetive clothing". I suspect they mean masks, but I guess it's not unimaginable that the border patrol agents would be issued bunny suits while keeping the border open.
Here is your link.
"Last night the US authorities were still allowing people to cross the border from Mexico, where it is thought that the swine flu emerged. But customs officials at the San Ysidro and Otay Mesa crossings were given protective clothing. "
In The News
7 hours ago