Scary news if you are flying any time soon: Airport screening procedures to stop the spread of infectious diseases miss half to three-quarters of infected travelers, according to a new study.

The study, authored by UCLA researchers and published last month, comes shortly after a measles outbreak and an Ebola scare put more Americans on high alert.

One key reason that the detection rate is so low, the study suggests, is that many travelers are not honest about their exposure to diseases. In most cases, health authorities rely on questionnaires to try to detect infected travelers.