Why is the Ebola virus considered a serious/dangerous virus?

Review the descriptions from the Baltimore system of virus classification. Group II: Single‑stranded DNA, (+) senseGroup III: Double‑stranded RNAGroup IV: Single‑stranded RNA, (+) senseGroup V: Single‑stranded RNA, (−) senseGroup VI: Single‑stranded RNA, (+) sense, Reverse transcriptase Review the descriptions from the Baltimore system of virus classification. Group II Group III Group IV Group V Group VI

Which of the following is LEAST helpful in explaining why the incidence of HIV/AIDS is higher in Sub-Saharan Africa than elsewhere? Group of answer choices The disease has been in Sub-Saharan Africa longer than in other regions. The warm, wet conditions in much of the region are favorable to the growth of mosquitoes. Sub-Saharan Africa is poorer than other regions. Many African men engage in long-distance mobility to work in mines and distant cities.

Why does the environmental conditions not really matter to the virus right now? In other words why can it still spread quickly even if it not in an enclosed and dry spaces?