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Why would it take 48 hours to get the results back? I had heard the tests could take 12 hours....but 48?

Here are all the tests that currently can be used to diagnose Ebola. They all need different time to run.

Timeline of Infection	Diagnostic tests available
Within a few days after symptoms begin	Antigen-capture enzyme-linked immunosorbent assay (ELISA) testing IgM ELISA Polymerase chain reaction (PCR) Virus isolation
Later in disease course or after recovery	IgM and IgG antibodies
Retrospectively in deceased patients	Immunohistochemistry testing Polymerase chain reaction (PCR) Virus isolation