We've surely been exposed, but exposure doesn't guarantee catching it. At least with Yukinosuke he was exhibiting similar mental symptoms that preclude the actual transformation.
[And in retrospect they should have suspected something with what they knew of the disease. But it can be hard to tell what's just the place around them. Lynne is far better at controlling her emotions than she looks, but someone closer may have seen some signs.]
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[ Ludger had assumed it was an inevitability, given the places they were living in, sleeping in, drinking from, etc etc. ]
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[And in retrospect they should have suspected something with what they knew of the disease. But it can be hard to tell what's just the place around them. Lynne is far better at controlling her emotions than she looks, but someone closer may have seen some signs.]