It is likely that the "s" strain is the ancestral species because it is found all over sub-Saharan Africa, whereas the "M" strain is concentrated on central and west Africa.
S类可能是更原始的种群因为它被发现存在于撒哈拉沙漠以南的非洲的各地。
It is likely that the "s" strain is the ancestral species because it is found all over sub-Saharan Africa, whereas the "M" strain is concentrated on central and west Africa.
S类可能是更原始的种群因为它被发现存在于撒哈拉沙漠以南的非洲的各地。
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