Study:over 450 students had active infestations with over 14,000 lice combined, but the floors of their 108 classrooms did not have even one louse - they were completely uninfested http://www.ncbi.nlm.nih.gov/pubmed/
Fact: MN School nurses tell us that lice outbreaks seem to occur each year and they are not seeing a dramatic increase over previous years
Fact: Summer 2011 MN Lice Lady performed 1000+ head checks at summer camps. Per camp session only 3-5 cases out of 160 campers were positively identified with lice (and subsequently treated) by MN Lice Lady. This 2-4% is higher than the 1% to 1.6% generally quoted by CDC and studies but still considerably low.
Fact: Outbreaks are not easily eradicated with the OTC pesticide of permethrin due to pesticide resistance
Fact: We regularly see live lice on clients' heads after home treatments of NIX and RID (permethrin based products)
Fact: This actually depends on the level of infestation of the neighboring head.
Fact: Lice have to have very specific spatial and kinetic conditions in order to crawl over to grasp a hair of a neighboring head
Study: Only 7.1% of hair to hair transmission attempts worked (34 out of 480); the louse had to be oriented outward on the hair (not ready to feed at the base of scalp), the neighboring hair had to be parallel to the hair the louse was on, the neighboring hair had to move very slowly (4 m per minute) http://www.nature.com/jid/journal/v119/n3/full/5601602a.html
Fact: Re-infestions are often the same infestation which was never completely eradicated and has erupted again.
Fact: The Head Lice Life Cycle illustrates that a couple of missed nits can take upwards of 22 days (more than 3 weeks!) to become adults before a new egg is even laid - and most likely another week before enough nits are visible to spot. That's one month, well outside the recommended two week time frame to check after an infestation.
Myth: Vital to bag items for two weeks to prevent reinfestation
Fact:Lice start dehydrating immediately and die between 3 hours (nymphs) to 48 hours (adults) off their host
Fact:Nits need precise conditions in order to hatch a warm incubator (the head) and precise humidity in order to hatch
Fact: Newly emerged nymphs need to feed promptly or will die within a couple hours
Fact: Lice is transmitted through hair to hair contact and have hook claws to ensure they don't accidentally "fall" off a hair shaft into the environment
Study:over 450 students had active infestations of over 14,000 lice, but the floors of their 108 classrooms did not have even one nit (or louse!) - they were completely uninfested http://www.ncbi.nlm.nih.gov/pubmed/