The terrorists are shown digging up the body of an Ebola victim in Liberia to harvest the virus for future use. First, the virus only remains viable in the body for a week, therefore they would've had to exhume it before then, second, the Ebola victims in Liberia were burned, not buried to prevent potential spread of the virus.
When Cathy is discussing the new case of Ebola and learns that the patient helped dig up a body for two "middle-eastern men" both she and the other infectious disease doctor she is speaking with state that they have "no idea" what two middle-eastern men would want with an ebola victim's body. That specialists in infectious diseases would not consider the possibility that terrorist might try to weaponize Ebola is beyond realistic belief.