A research organization, the Center for Infectious Disease Research and Policy (CIDRAP) at the University of Minnesota has found evidence that Ebola may be airborne, and that the N95 masks/respirators that are commonly used are ineffective, and "recommends the minimum protection for healthcare professionals in high-risk settings is a “powered air-purifying respirator (PAPR) with a hood or helmet” that will filter 99.97% of all particles down to 0.3 microns in diameter.