Dallas County health officials are trying to keep the swine flu from seeping into the county on bus lines.
Officials were at several bus lines that carry passengers to and from Mexico daily.
"We want to make sure we present the information as they arrive. You're right, they're coming in 24-7." said Zachary Thompson, Dallas County Health and Human Services director. "We want to make sure that we're protecting not only them, but also the citizens of Dallas County."
Thompson was out at the El Conejo bus service in South Dallas, handing out fliers. Many of the passengers getting off the bus were coming from Mexico and were wearing masks. But one man wasn't.
He had just stepped off the bus after a nine-hour ride.
"I didn't even know when I went over there that it was happening, until I got over there, and I started noticing everybody walking around with masks," Lopez said. "Nobody told me nothing before I left."