So did Rickettsiales, an order of bugs whose diseases include typhus and spotted fever.

When Rickettsiales was the most abundant type of organism, a cymbal crash highlights the occasion.

This process seems to be specific to E. ruminantium and is not observed in the other Rickettsiales.

Due to these molecular features, the order Rickettsiales can be used to uncover broader principles of bacterial immunity.

Results: We successfully adapted the SCOTS method (Selective Capture of Transcribed Sequences) on the model Rickettsiales ER to capture mRNAs.

Conclusions: We conclude that this SCOTS method has a key importance for the transcriptomic analysis of ER and can be potentially used for other Rickettsiales.