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The nits look like tiny grains of rice that are attached to strands of hair near the base of the scalp. They can easily be mistaken for dandruff, scabs or hair spray droplets, the CDC says.
The presence of nits alone, however, is not an accurate indicator of an active head louse infestation. Generally, white nits are empty egg casings, while brown nits may still contain viable louse larva. One way of determining the nit is to squeeze it between two fingernails; it gives a characteristic snapping pop sound as the egg bursts.
Head lice, like other insects of the order Phthiraptera, are hemimetabolous. [1] [10] Newly hatched nymphs will moult three times before reaching the sexually mature adult stage. [1] Thus, mobile head lice populations may contain eggs, nits, three nymphal instars, and the adults (male and female) . [1]
Nature, Intentions, Time, Special Instructions (NITS), a form of emergency communication; National Invitation Tournament, for U.S. men's college basketball; Nagpur Improvement Trust, India
The terminology originates from the common act of manually removing nits (the eggs of lice, generally head lice) from another person's hair. [4] As nitpicking inherently requires fastidious attention to detail, the term has become appropriated to describe the practice of meticulously searching for minor, even trivial errors in detail. [5]
A dead nit attached to a hair. No nit policy is a public health policy implemented by some education authorities to prevent the transmission of head lice infestation.The "no nit" policy requires the sending home and barring of all children who have nits (egg shells) on their hair from controlled settings such as school, summer camp or day care facilities.