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Focusing on the cases of two dogs can seem trivial compared to the 4,000 people in West Africa who have died from Ebola this year.

Some studies have shown that dogs may experience asymptomatic Ebola infections, the CDC says -- meaning they may have the virus but don't get sick. Also, the agency says, human infections haven't been linked to dogs.

2014 Outbreak:(Full historical timeline at bottom)Cases listed below include confirmed, probable or suspected cases of Ebola as of November 4, 2014 (World Health Organization and CDC): Guinea - 1760 cases, 1054 deaths Liberia - 6619 cases, 2766 deaths Mali - 1 case, 1 death (infection originated in Guinea) Nigeria - 20 cases, 8 deaths Senegal - 1 case, 0 deaths (infection originated in Guinea) Sierra Leone - 4862 cases, 1130 deaths Spain - 1 case, 0 deaths United States - 4 cases, 1 death (two infections originated in the United States, one in Liberia and one in Guinea)