The case of Thomas Eric Duncan in 2014 illustrates the timeline and transmission of Ebola. Nine days after helping transport an Ebola-stricken neighbor in Liberia, Duncan developed symptoms, corresponding to the virus's non-contagious eclipse period. He was initially misdiagnosed with sinusitis at a Dallas hospital and sent home, but returned two days later when his condition deteriorated and blood tests confirmed Ebola. He was quarantined but died several days later, prompting a back trace where public health officials monitored 10 high-risk and 50 low-risk contacts, none of whom contracted the disease.