Having cystic fibrosis would it be unsafe to travel to a third world country ?

A big "it depends": Well, there is third world and there is "third world". Obviously with CF there is a big risk of becoming colonized with new bacteria, and that exposure is much greater there than here. That said, if your pulmonologist is cool with it, it's probably ok. A lot depends on your degree of lung function, how long you're going to stay there, and how much contact there will be. Tb is a big risk.

Depends: If a child has minimal symptoms from his cf, he might be fine. He will have more trouble getting medical care in a third world country if he becomes ill, however. The more complicated the CF is, the more risky such a trip would be.

Avoid smoke exposure: Exposure to infections and smoke ( from cigarettes or open fires used to cook ) may worsen CF lung disease. Many CF patients travel with appropriate precautions, vaccines and avoiding situations that may lead to a CF complication. Taking your CF medications, nebulizer and adhering to your medical regimen and chest pt will help you have a good trip.