Good news everybody!
Ruben doesn't have meningitis!!! It seems that some Meningococcal Bacterium managed to infect the blood sample after it left Ru's body, probably due to poor hand hygiene (hopefully in the lab). However, he was promptly given the anti-biotic for the Meningitis as it took 2 days to confirm the results.
The repeated blood tests however did show a Diplococcus bacterial infection, which CAN lead to Meningitis infections... However, the anti-biotic that had already been administered will have killed this infection.
Ruben is currently happy and healthy at home. The Neutropenia is still a major issue and has not improved.