For example, here's an excerpt from the fact sheet from the Entomology Department of the College of Agricultural Sciences of Penn State University. It is regarding the viability of eggs that are not right near the scalp:
"Eggs hatch in five to ten days when the temperature is between 95 degrees and 100 degrees F (35-37.8 degrees Celsius). Below 74 degrees F (23.3 Celsius), most eggs will not hatch. People finding nits on hairs wonder if they are old nits which have already hatched or new nits which may still hatch. Since human hair grows about 1/2 inch per month, any nits found on a hair 1/4 of an inch from the scalp would be approximately 16-days old, and would have hatched already, or will not hatch."
So, you probably don't have to worry about those far-way eggs because they were laid a long time ago and if they haven't hatched yet, they are not going to. Or, what you are seeing could just be the egg casing. Still, I like to remove them to avoid confusion.
1 comment:
Can you transfer nits from a nitcomb (if you dont wash it) to another head and can they then hatch?
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