From what I've read the only thing they need for the rest of their lives is L-Lysine. Their own immune system usually does the job of controlling the virus, which is why they have flare-ups during times of stress when the immune system is suppressed. They will probably need antibiotics when they have a flare-up to control any secondary bacterial infections.
I'm sure they would benefit from Rescue Remedy & Feliway when they are prone to stress, too.
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