Click the play button on the video window to the right to see the storyThe United States issued a travel advisory Monday, telling American citizens not to go to Mexico for nonessential travel.
Arizona is the only border state that has not reported a case of swine flu, but Border Patrol officers say they are prepared.
Health scares are nothing new to them, after dealing with an influx of tuberculosis and other communicable diseases over the past decade.
The Arizona-Mexico border was still teeming with people.
Many of them said they were traveling to Mexico for leisure, and that they weren't worried about swine flu, the virus that killed dozens of people in Mexico and infected hundreds more in the United States.
"My boss is God, so I don't worry about it," said Jim Jordan, who travels across the border at least twice a day to do missionary work. "When my time's up, my time's up. So I don't worry about it. It's all in his hands."
Border Patrol officers said they had not denied anyone entry into Arizona because of swine flu, but they are on keeping an eye out for people with symptoms.
Officers said they have been instructed to pull travelers aside if they display visible symptoms, to question them and educate them about the virus.
Everyone who passed through was given a flyer telling them how to minimize their risk of contamination and what to look for in case they already acquired it.
Officers will call local and state authorities, as well as the Center for Disease Control, to alert the agencies to possible cases, if they see any.
Those who officers conclude have swine flu after questioning, could be turned away at the border if they are not citizens, but so far, business is carrying on as usual.
Meanwhile, people passing through the port, remained undeterred.
Border officers wore gloves, but not masks, and people traveling through the port did not take any visible precautions.
"In my opinion there are too many things out there to worry about a flu," said Jonathan Quinn, who crosses the border about twice a month. "You can't just be worried about one little thing. There's a lot more things out there in this world that will kill you."
Others, who have to cross into Mexico for business, but have been scared by the increasing number of reports of illness, are more nervous.
"We're not going to get too close to people, keep our distance," said Leticia Yribe, who was going to Mexico to buy medicine. "We're not going to eat there because we already ate at the restaurant. We have our own water, and we probably will not go to the bathroom."
For Francisco Beran, an 80-year-old taxi driver who has come in contact with strangers arriving from Mexico every day for six decades, swine flu is not a concern.
"No, no, no, no," said Beran, shrugging off the suggestion that germs could find their way into his taxi. "For me it's no problem."
