Just watched that episode again recently. Yes, Mindy Church had the ship and got the virus from it to make Clark/Superman sick.
How it went from her possession to Clark's & Sarah's (or what happened to it after that) for the whole season three finale was never explained clearly. My guess is that Zara and Ching know some things that Clark doesn't about their powers.
VirginiaR.
"On the long road, take small steps." -- Jor-el, "The Foundling"
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"clearly there is a lack of understanding between those two... he speaks Lunkheadanian and she Stubbornanian" -- chelo.
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