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This implies that the genetic link is somewhat of a coincidence, the family members just happen to have all caught the same virus? Is that the right interpretation? Because BD does seem to come in waves in families.

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It’s not just that they caught the virus, but that their immune systems are unable to defeat the virus. So, the battle remains active for life, and becomes a chronic infection.

Presumably, this would suggest that the genetic component is the susceptibility to the virus, and inability to defeat it.

Seems unlikely that virus is so prevalent to infect multiple family members that do not cohabitate but nonetheless show genetic link for BD.

Perhaps it's both? Some people/families are more genetically predisposed, but it takes the virus to actually trigger BPD?

I doubt it. Is it common that everyone eventually catches that virus?

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