Introduction: Water can support the growth of different microorganisms which may result in contamination. Therefore, the microbiological examination is required for testing the hygienic probity of water. In the study of microbial composition of untreated, natural spring and mineral water differences in the presence and number of bacteria during the two periods, winter and summer, are detectable.Methods: In our study, we analyzed and compared the following parameters, specified in the Rulebook: total bacteria and total aerobic bacteria (ml/22 and 37°C), total Coliform bacteria and Coliforms of fecalorigin (MPN/100ml), fecal streptococci as Streptococcus faecalis  (MPN/100ml), Proteus spp (MPN/100ml), and Pseudomonas aeruginosa (MPN/100 ml) Sulphoreducing Clostridia (cfu / ml). The paper is a retrospective study in which we processed data related to the period of 2005-2009 year. While working, we used the descriptive-analytical comparative statistical treatment.Results: The obtained results show statistically significant differences in the microbial composition of untreated water in the two observed periods,Conclusions: Findings were consequence of different weather conditions in these periods, which imply a number of other variable factors.

Introduction: The role of salt in the diet is very important, however what effect will lead to its entry into the organism depends on the amount of salt ingested. Elevated salt intake is a risk factor for hypertension, heart disease, adversely affects the kidneys, helps the development of osteoporosis. The aim was to examine sodium intake in the student population through an objective assessment of nutrition students and the students' subjective experience of salty foods and salty foods influence on the organism.Methods: The research is cross-sectional study, which is carried out in April 2010 among students at the University of Sarajevo.Results: More than half of students from the FHS considers that the greatest amount of salt into the body, adding salt to food during the meal, 34% considered that it was during the preparation of food by 10% of processed products in the food industry and 4% said that it was the intake of salt, which naturally found in foods. Not in a group of students there who suffer from hypertension, while in their families the disease is present.Conclusions: Subjects eat a quantity of salt that are well above the recommended. This problem must be approached in a more organized educational, health educational and research terms.

Introduction: Gastrointestinal infectious diseases are a group of frequent diseases in developing countries as a result of industrialization in food production and often consuming of the food in public places. In Bosnia and Herzegovina and in Canton Sarajevo these diseases are frequent. The aim of this work is to investigate epidemiological characteristics of the most often gastrointestinal infectious diseases in Canton Sarajevo (Enterocolitis acuta, Toxiinfectio alimentaris, Salmonellosis, Amoebiasis) compared with Viral Hepatitis A and to estimate the need for the implementation of vaccination against this disease.Methods: We used individual reports as well as monthly and annual bulletins about the movement of infectious diseases which are obligatory for reporting from the Epidemiology department of the Institute for public health in Canton Sarajevo. This work is a retrospective study, for the period 2005-2009. Descriptive- analytical method was used. In statistical processing we used mean, structure index and trend index.Results: The research showed that gastrointestinal infectious diseases are registered in a huge number in all the observed years. The most often was Enterocolitis acuta, and the rarest was Viral Hepatitis A. The diseases were mostly sporadic. Distinct seasonality and coherence with warm months in the year is expressed in Enterocolitis acuta and Intoxicatio alimentaris, while the other diseases are registered during the whole year.Conclusions: Incidence of gastrointestinal infectious diseases in Canton Sarajevo is high and we need to work intensively to improve sanitary conditions as the most eficient preventive measures. There is no justification for implementing of the vaccine against Viral hepatitis A.