Tsallake zuwa babban abun ciki

Jimillar adadin wuraren gwajin WNV da aka tattara na zaɓaɓɓun shekaru waɗanda ke ɗauke da aƙalla sauro guda ɗaya wanda ya gwada ingancin WNV.

Note: Sauro guda ɗaya kawai a cikin tafkin yana buƙatar gwada ingancin WNV don ɗaukacin tafkin don a ɗauka tabbatacce.