NanoViricides Inc. (NNVC)

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The Ebola virus arrived in a fifth country this week, after health officials reported that a man with Ebola symptoms showed up at a hospital in Senegal. The man was a student from Guinea, where the virus has affected 648 and killed 430.

Across West Africa, the virus has already killed more than 1,552 people in Liberia, Guinea, Sierra Leone and Nigeria, according to the World Health Organization.

While doctors and government officials have spent months trying to stop the outbreak, the infections continue to rise: More than 40 percent of the total cases in this outbreak have occurred within the past 23 days.