To be clear I don't work for RML. I just live here and work remotely for another company (originally for another bio research institution but that just confuses things.)
I suspect RML is one of the oldest and also one of the most active in areas like ebola research. Many of the newer ones seem to be focused on emerging diseases and bioterrorism and less on the existing really nasty diseases.
There are a bunch of BSL-4 in various settings:
https://en.wikipedia.org/wiki/Biosafety_level#List_of_BSL-4_...
I suspect RML is one of the oldest and also one of the most active in areas like ebola research. Many of the newer ones seem to be focused on emerging diseases and bioterrorism and less on the existing really nasty diseases.