How many nits does a louse lay at one time?

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How many nits does a louse lay at one time? - briefly
A female head louse generally deposits a single nit during each oviposition event, occasionally laying two if conditions are optimal. Over its lifespan the insect may produce up to ten nits, but only one or two are laid at any one time.

How many nits does a louse lay at one time? - in detail
A female head louse (Pediculus humanus capitis) typically deposits a small clutch of eggs during each oviposition event. The average clutch size ranges from three to six nits, with most observations reporting four or five. Egg‑laying occurs at intervals of about one to two days, allowing a female to produce up to 30 – 40 eggs over her lifespan of roughly three weeks.
Key points:

Clutch size: 3–6 nits per laying episode.
Frequency: one oviposition every 24–48 hours.
Total reproductive output: 30–40 eggs per adult female.

Environmental factors such as temperature, host hair density, and the health of the adult can cause slight variations, but the described range represents the standard reproductive pattern for the species.