Astronomers have suggestedseveral times over the past year that the BICEP2 team had been fooled by that Galactic signal (see «Full - Galaxy dust map muddles search for gravitational waves»).
Analysis of the viral sequences suggests that one of these introductions, which has been linked to several EVD cases in Monrovia, including health care workers at Redemption Hospital, likely led to the largest wave of cases in Liberia.