Background & Objective: The prevalence of pediculosis in communities is one of the criteria for individual hygiene and one of the important diseases among students. Pediculosis capitis is very important in boarding schools. The aim of this study is to determine the prevalence of pediculosis capitis and relative factors among boarding school students.

 Methods: This study with a descriptive, analytic and cross - sectional method was performed upon 417 girl students from Ardabil boarding schools who were selected using systematic method. Pediculosis was diagnosed through direct observation by trained general practitioners. The data were collected using questionnaire and were analyzed by EPI 2000 and SPSS10.

 Results: 116 students (27.8%) complained about itching of scalp.41.2% of the students never took a shower in school and only 45.2% of them took a bath in school once a week or more. 74.3% of the students said that there was a bathroom in their school and about the accessibility of these bathrooms, 53 students (12.7%) had previous involvement with head lice. 21 cases (5%) had previous treatment of pediculosis capitis. 119 of the students (28.5%) suffered from head lice. There was a significant relationship among suffering from head lice and previous illness and existence of bath in home. No significant relationship was observed among this disease and sharing devices such as comb or head scarf in school or home. Prevalence of the disease among rural students was more common than urban ones.�

 Conclusions: some boarding school in Ardabil did not have enough hygienic facilities and the students of these schools were mostly from rural areas.

Background & objectives: Some herbs contain compounds with antioxidant activity and can be used to protect or cure damages caused by chemical toxins. The aim of this study was to evaluate the effects of carbon tetrachloride (CCl4) on total antioxidants in various tissues and Tanacetum parthenium impacts on reducing devastating effects of carbon tetrachloride.

Methods: A total of 42 male Wistar rats were divided into seven groups of six animals in each group: normal control, damaged control, three groups that treated with 40, 80, and 120 mg/kg of Tanacetum parthenium extract 14 days before CCl4 injection and two groups served as post-treatment groups that received 80 and 120 mg/kg extract 2, 6, 24, and 48 h after CCl4 injection. At the end of study  the liver, kidney, testis, and heart were removed and then homogenized and then the antioxidant activity of the tissues assessed using FRAP method. Results were analyzed by one-way ANOVA test.

Results: The results showed that the injection of carbon tetrachloride significantly decreasestotal antioxidant in both liver (p<0.001) and kidney (p<0.05) tissues. Administration of extract significantly (p<0.05) increased the total antioxidant of liver and kidney.
Conclusion: Protective effect of Feverfew against CCl4 induced damages is more effective in liver and kidney than testis and heart..