===Ebola and Marburg virus===
*''Filoviridae''
*natural host of Marburg virus is almost defined as fruit bat
**Marburg virus has been isolated from fruit bat
*natural host of Ebola virus is still not defined as fruit bat
**viral isolation from fruit bat is required to define
**indirect evidences have been identified
***fragments of genome of Ebola virus have been detected from fruit bat by PCR
***antibody against Ebola virus has been detected from fruit bat sera
***experimental infection of Ebola virus to fruit bat was successful and bat didn't show any symptoms
===Lassa virus===