WASHINGTON (REUTERS) - President Barack Obama said on Monday his administration was working on additional protocols for screening airplane passengers to identify people who might have Ebola and would step up efforts to make medical professionals aware of what to do if they encounter a case.

Obama made the disclosure after meeting top administration officials involved in attempting to prevent an outbreak of Ebola in the United States. The president told reporters the chance of an outbreak in the United States was "extremely low" but that there was not a large margin for error.

The White House is so far not considering a travel ban from West Africa, but Obama made clear that some steps were being pondered to bolster U.S. defenses against Ebola. He said officials were working on additional protocols for screening air passengers to identify people who have the deadly virus, which has been blamed for hundreds of deaths in West Africa.

Obama told reporters he also planned to step up pressure on large countries, which he did not identify by name, to contribute aid to West African nations struggling to contain the worst outbreak of Ebola on record.