Unfortunately, this doesn't let the fleas and rats "off the hook", because of the vector by which plague is spread - i.e., hosted by rats and spread by the bite of their infected fleas.
A natural disaster would certainly make the population more vulnerable to disease, but would not change the natural vector of the disease. If anything, a volcano would have made the rats more anxious to move around and circulate through the population, thus further aidng the spread of the plague.
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