ATLANTA (AP) – Provocative new research suggests international rules that bar potentially infectious tuberculosis patients from flying are too stringent and airline passengers are really at little risk from catching TB from a fellow traveller.

Global and US health authorities also go too far in advising testing of passengers and crew on long flights when an infected flier is discovered, said the researcher, Dr. Ibrahim Abubakar, in a paper published in a British medical journal. The paper is controversial. US health officials disagree, and a prominent TB expert says the findings are based on paltry data and current guidelines are appropriate.

Abubakar chaired a European scientific panel that looked at tuberculosis and air travel. His paper, released this week, analyses 13 earlier studies of 4,300 airline passengers from six countries. He concluded that only two studies offered convincing evidence of an infected passenger spreading the disease to others. He counted only ten infections diagnosed in thousands of passengers who flew with infected travellers. The paper mentions what may be the most famous incident of a TB-infected airline passenger: Andrew Speaker, a Georgia lawyer with a drug-resistant form of TB who ignored government advice and flew to and from Europe for his wedding and honeymoon in 2007. Hundreds of passengers who travelled with him were tested, and none was found to have tuberculosis, the Centers for Disease Control and Prevention has said.

Abubakar declined to discuss that case, although he does urge more caution when drug-resistant TB is involved, as was the case with Speaker. Even so, his paper suggests it wasn't necessary to test the hundreds of passengers who were sitting around Speaker on two flights. Abubakar said such testing is unnecessary unless there is evidence an infected passenger is contagious and has been infecting others. He argues that people with easily treatable tuberculosis who have been taking medicine at least two weeks should be able to board commercial flights.