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Introduction: Attention to food safety and health at all stages from production to consumption is inevitable. Inappropriate sanitary status of the food production, distribution and supply centers caused food-borne diseases. The aim of this study was to evaluate the environmental health indicators of halva and tahini production centers in the city of Ardakan in 2013. Materials & Methods: This is a descriptive, cross- sectional study. For data collection, the checklist were prepared consisting 5 part raw materials store, production processing halls, packaging halls, product store and bathrooms according to regulations form of article 13, law of edible, drinking, cosmetics materials of the department health, treatment and medical education with questions in different fields such as health card status, observance personal hygiene, status production centers structural, observance the criteria about the number of bathrooms, showers and toilets, wastewater disposal method and observance health principles in the halva and tahini production centers that during a inspection from 16 production centers were completed in the winter. Final, obtained data analyzed by SPSS, version 18 and χ2 test. Results: Generally, 75% production centers had favorable hygienic status and 25% had slightly favorable hygienic status. According to obtained results, hygienic status of production centers had relatively favorable and favorable conditions and only in January and February in 31.3% and 18.8% processing hall and 12.5% product store was in a very favorable hygienic status. The results showed that in terms of environmental health status, 62.5% production centers in raw materials store part, 66.66% in production processing hall, 20.83% in packaging hall, 60.41% in product store and 37.5% in bathrooms had favorable status. Based on the results, hygienic status of bathrooms and processing hall achieved lowest and highest score, respectively. Statistical analysis showed that between hygienic status and production rate (p=0.411) there is no significant relationship. Conclusion: The results of this study indicate that the halva and tahini production centers of Ardakan city in terms of environmental health indicators had slightly favorable status to favorable and none of the production centers had not very favorable conditions. The results of this study can be used to improve health status of halva and tahini production centers.

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Introduction: Nowadays, use of virtual socail networks is increasing . However, few studies have been conducted  about  factors influencing the use of social networks by using theories of health education  among students.  The present study was to determine predictive factors of virtual social networks among students of Yazd university of medical sciences based on the constructs of the Theory of Planned Behavior.

Methods: This cross-sectional study was conducted on 300 Students in 2016, who were selected by stratified random sampling method. The  study data was collected from a questionnaire based on the constructs of the Theory of Planned Behavior including attitudes, subjective norms, perceived behavioral control, and behavioral intentions and behaviors. The data collected were then analyzed via the SPSS Software using descriptive statistics, Pearson product-moment correlation test, one-way analysis of variance, and regression.

Results: The mean age of university students was 22.28±3.69 years. The results also suggested that 98.3% of these university students were using virtual social networks. Moreover, the findings of the regression analysis indicated that attitudes, subjective norms, and perceived behavioral control were predictors of intention to use social networks and attitudes had the highest predictive power for the intention to use social networks (β=0.38). Furthermore, the results of the regression analysis demonstrated that behavioral intention, attitudes, and subjective norms among the constructs of the Theory of Planned Behavior could predict the behavior to use virtual space.

Conclusion: Given the high level of social networking utilization, the necessity of planinig and doing of interventions should be noted to manage it. It is also required to induce and educate the correct attitude about the use of network and how to take advantage of  it 

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Abstract
Introduction: The World Health Organization on March 11, 2020 declared the outbreak of severe acute respiratory syndrome Corona virus 2 disease (COVID-19) a pandemic situation. The main aim of this study was investigating mortality of COVID 19 by considering chronic diseases.
Materials and methods: this study was conducted as a cross-sectional in which all confirmed cases were examined. The variables considered in this study were age, sex, diabetes mellitus, cancers, hypertension, heart diseases, kidney diseases, and liver diseases. Independent sample t test, Chi-square and binary logistic regression were used to data analysis. All statistical analysis was done in SPSS 16 and significant level was set at 0.05.
Results: Out of 22849 PCR and CT scan tests, 16061 ones were positive. According to the confirmed cases, prevalence of COVID-19 was calculated about 0.019. Also hospital case fatality rate and mortality rate were calculated 156 and about 8.2 per 100000 respectively.
 Hypertension, and age had significant relationship with morbidity of COVID-19, in other hand, age (OR: 4.51, p<0.001), kidney diseases (OR: 1.84, p<0.001), diabetes mellitus (OR: 1.31, p<0.001), cancer (OR: 2.73, p<0.001), liver diseases (OR: 2.27, p<0.001) had impact on mortality of covid-19. Population Attributable Fraction (PAF) showed that diabetes mellitus, cancers, kidney diseases, and liver diseases had 4.2, 2.4, 1.3, and 0.2 percent, respectively.
Conclusion: age and some underlying diseases increase odds of death due to COVID-19. It seems that preventing high-risk people from being infected is an effective solution to reduce COVID-19 death rate. To do this, health protocols need to be implemented more seriously for these sensitive groups.