BACKGROUND. Ebola virus (EBOV) causes periodic outbreaks of life-threatening EBOV disease in Africa. Historically, these outbreaks have been relatively small and geographically contained; however, the magnitude of the EBOV outbreak that began in 2014 in West Africa has been unprecedented. The aim of this study was to describe the viral kinetics of EBOV during this outbreak and identify factors that contribute to outbreak progression.
METHODS. From July to December 2014, one laboratory in Sierra Leone processed over 2,700 patient samples for EBOV detection by quantitative PCR (qPCR). Viremia was measured following patient admission. Age, sex, and approximate time of symptom onset were also recorded for each patient. The data was analyzed using various mathematical models to find trends of potential interest.
RESULTS. The analysis revealed a significant difference (
CONCLUSIONS. Our results indicate that initial viremia is associated with outcome of the individual and outbreak duration; therefore, care must be taken in planning clinical trials and interventions. Additional research in virus adaptation and the impacts of host factors on EBOV transmission and pathogenesis is needed.
Marc-Antoine de La Vega, Grazia Caleo, Jonathan Audet, Xiangguo Qiu, Robert A. Kozak, James I. Brooks, Steven Kern, Anja Wolz, Armand Sprecher, Jane Greig, Kamalini Lokuge, David K. Kargbo, Brima Kargbo, Antonino Di Caro, Allen Grolla, Darwyn Kobasa, James E. Strong, Giuseppe Ippolito, Michel Van Herp, Gary P. Kobinger
Characterization of the viral load levels.
When applicable, the arithmetic mean is shown, and the error bars represent the 95% CI. (