Could have, but wasn't. And there is nothing in any of the state medical marijuana laws which solves this problem.
Therefore, we can conclude that the medical marijuana allowed by these states can kill immunosuppressed patients. If some doctor "recommended" homegrown marijuana to one of my family members undergoing chemo and they died from pulmonary aspergillosis, I'd own his house, car, and half his income.
This borders on quackery.
It does, indeed, border on quackery, to continue to claim, explicitly or otherwise, that a medical problem that was attributed to a bacteria, somehow means that marijuana is dangerous. It locates itself, in fact, on the spectrum of common sense, somewhere between desperation and insanity.