Seasonality trends of Pediculosis capitis and Phthirus pubis in a young adult population: follow-up of 20 years.
BACKGROUND
It is not mandatory to report Pediculosis capitis and Phthirus pubis in most countries; therefore, little is known about the seasonality of these infestations.


METHODS
We analysed the data based on routine and mandatory reporting of every case of Pediculosis capitis and Phthirus pubis to the Army Health Branch Epidemiology Department, Israel, over the last two decades.


RESULTS
The average 20-year incidence of Pediculosis capitis shows a significant rise during the warmer months (R2 = 0.692, P < 0.05) with a parallel significant decrease in the cooler months (R2 = 0.893, P < 0.05). The results for Phthirus pubis show a significantly higher person-time incidence in the winter (P < 0.001). Sensitivity analysis to investigate possible sources of heterogeneity during this time indicated that no single year was an important source of heterogeneity.


CONCLUSIONS
Pediculosis capitis is more frequent in the warmer months, whereas Phthirus pubis is more dominant in the cooler months.
Johns Hopkins University, School of Medicine, Room 771, Ross Research Building, 720 Rutland Avenue, Baltimore, MD 21205, USA. mimouni@post.tau.ac.il
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Mimouni
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Ankol
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Gdalevich
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Grotto
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Davidovitch
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Zangvil
D000328:Adult; D000818:Animals; D005260:Female; D005500:Follow-Up Studies; D006119:Groin / Q000469:parasitology; D006801:Humans; D015994:Incidence; D007557:Israel / Q000453:epidemiology; D010373:Lice Infestations / Q000453:epidemiology*; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D008889:Military Personnel; D010374:Pediculus; D020061:Phthirus; D011159:Population Surveillance; D012536:Scalp Dermatoses / Q000453:epidemiology* / Q000469:parasitology; D012621:Seasons