Reference for Niddah 66:1

או דילמא נוגעת היתה ולא סתרה

or is she rather regarded as one who merely touched it and, therefore, she does not cause the counting to be void? — Raba replied, His error is as deep as his subtlety: Granted that she causes her counting to be void, how many days could be affected? Should it be suggested that the counting of all the seven days should be void [it could be objected]: Is it not enough that she is treated like the man who had the intercourse with her?<span class="x" onmousemove="('comment',' If a man who was a zab emitted semen on one of the seven clean days following a zibah he loses that day only. ');">¹</span>

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