head lice surveillance on a deregulated otc-sales market a study using web query data头虱监测在管制otc-sales市场研究使用web查询数据.pdfVIP

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head lice surveillance on a deregulated otc-sales market a study using web query data头虱监测在管制otc-sales市场研究使用web查询数据.pdf

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head lice surveillance on a deregulated otc-sales market a study using web query data头虱监测在管制otc-sales市场研究使用web查询数据

Head Lice Surveillance on a Deregulated OTC-Sales Market: A Study Using Web Query Data 1,2 ˚ 1 ¨ 1 1 Johan Lindh *, Mans Magnusson , Maria Grunewald , Anette Hulth 1 Swedish Institute for Communicable Disease Control, Solna, Sweden, 2 Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden Abstract The head louse, Pediculus humanus capitis, is an obligate ectoparasite that causes infestations of humans. Studies have demonstrated a correlation between sales figures for over-the-counter (OTC) treatment products and the number of humans with head lice. The deregulation of the Swedish pharmacy market on July 1, 2009, decreased the possibility to obtain complete sale figures and thereby the possibility to obtain yearly trends of head lice infestations. In the presented study we wanted to investigate whether web queries on head lice can be used as substitute for OTC sales figures. Via ˚ ¨ Google Insights for Search and Vardguiden medical web site, the number of queries on ‘‘huvudloss’’ (head lice) and ˚ ¨ ˚ ‘‘harloss’’ (lice in hair) were obtained. The analysis showed that both the Vardguiden series and the Google series were statistically significant (p,0.001) when added separately, but if the Google series were already included in the model, the ˚ Vardguiden series were not statistically significant (p = 0.5689). In conclusion, web queries can detect if there is an increase or decrease of head lice infested humans in