While in-flight air-filtration systems typically work well in combating many airborne infections, Franzblau said, more flights are being delayed and sit on the tarmac using auxiliary ventilation systems " that don't work so well ."
12.
"The chances are very slim that there will be any kids testing positive " for full-blown tuberculosis, a sometimes fatal airborne infection, said Karen Frederick, chief program officer of Community Health Inc ., which hosts the Head Start program.
13.
Most accept that the Black Death was caused by a bubonic plague, although there are alternative theories of the Black Death and some research provides evidence that the plague was pneumonic, an airborne infection spread from human to human, not bubonic, one spread by the fleas on rats.
