Health experts need newly infected people to remember and recount everyone they've interacted with over several days in order to alert others who may have been exposed, and prevent them from spreading the disease further. But that process, known as contact tracing, relies on people knowing who they've been in contact with — a daunting task if they've been to a mass gathering.
And the process relies on something that may suddenly be in especially short supply: Trust in government.
"These events that are happening now are further threats to the trust we need," said Dr. Sandro Galea, dean of the Boston University School of Public Health. "If we do not have that, I worry our capacity to control new outbreaks becomes more limited," he said.