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Prepatent period (ingestion to eggs in stool) for roundworms/ascarids is 29-50 days. Tapeworms have a prepatent period of 2-3 weeks. At 500X, your may be dealing with tapes....
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What fecal prep did you use? What magnification is this? If you're using regular fecal float and looking at 10X -most likely ascarids (roundworms). The nucleus isn't quite right though. If the magnification is higher (40x), these might be tapeworm eggs. Tapeworm eggs are about 50%...