Other techniques such as plasmaphoresis , intravenous immunoglobulin , and experimental antiviral drugs have been attempted on a trial basis .
Other techniques such as plasmaphoresis , intravenous immunoglobulin , and experimental antiviral drugs have been have not been reported to be effective .
Other techniques such as plasmaphoresis , intravenous immunoglobulin , and experimental antiviral drugs have been attempted on a trial basis , but have not been reported to be effective .