Admittedly, I know nothing about the other systems. I would think if they could already be making vaccine that was acceptable to the regulators with another system, they wouldn't be making it manually. Clearly the costs associated with individual cleanrooms are very high by comparison to having multiple closed systems in the same cleanroom. I don't know if the units you say could have been doing the job have existed long, but if they have, and if they could make DCVax-L, I believe they'd have purchased those systems rather than building the tiny clean rooms.
Of the other systems you're saying exist, how many are approved by the regulators and making approved products?
Gary