In medical negligence cases, causation requires a causal connection between the rationale or basis for the act or omission constituting the breach and the damage sustained. Where a breach relates to failure to protect against one type of infection risk, the fact that the prescribed treatment would have had a collateral benefit of reducing a different infection risk does not establish causation for damage caused by that different infection. The case also illustrates the importance of putting propositions to expert witnesses in cross-examination if those propositions are to be relied upon.
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