I've got a degree in chemical engineering and I've never heard of interferon till now.

I've heard of money though....I know how money is produced.

Anyway, are you talking about human body production when infected? If so, I think the specialised medical research professionals would be able to help better. It would be a case of very specialised study.
But since you're asking for engineers to answer, I guess you're more likely talking about industrial production? If so, it would probably be proprietary information and only the top guys at pharmaceutical companies would know.