Readers write about "sin taxes" and healthcare in New Orleans.
Airplanes themselves are safe, experts say, but flights to Mexico have been cut. Drug cartel violence is an issue too.
Scientists are only now getting a handle on the details of the outbreak, so governments have taken a path of caution.
The flow of capital and travelers across international borders has accelerated in recent years, presenting new challenges.
Twitter is spreading important information as well as rumors about the outbreak, raising questions about whether the social networking site is helpful.
First US death reported in Texas; two schools shuttered in New York.
European travel warnings and canceled trips likely to hit Mexico's $13 billion a year industry.