Background:Bacteriophages act only host bacterial pathogen selectively not affecting the normal microflora of the human digestive tract, not causing allergies. Also found that the bacteriophage preparations don’t have taste, smell and preparation technology doesn’t affect the structure of bacteriophage. Using of bacteriophages for treatment is safe and has established that they are very effective against multi-drug resistant bacteria according to conducted clinical studies. In our country is using the Bacteriophage preparate which is based on local strain of Salmonella Typhi. Nowadays there is no research data whether environmental physical and chemical factors can affect the Bacteriophage activity.Aim:To study whether the environment physical and chemical factors might influence on Bacteriophage of Salmonella Typhi.Materials and Methods:In this study, were used the test strains of the Salmonellatyphimurium, Salmonella typhi and Bacteriophage of Salmonella Typhi. All procedures are performed according to Mongolian National Standard MNS ISO 2416-94, 3317-94 and Bacteriophage of Salmonella Typhi.Our study was established that physical and chemical factors: temperature of water bath, chloroform action time interval, procedure to kept biopreparates all can affect bacteriophage lysis activity.Conclusions:Any use of bacteriophages did not reveal any adverse effects. From the Bacteriophage of Salmonella Typhi preparations kept up to 3 years can be isolated bacteriophage strains by our improved method.

Background: According to the report of see in 2016, 90% of adults are using mobile phones and 64% smart phones, and healthcare organizations are beginning to explore the opportunities in which mobile phones can improve and streamline care. In this study involves the risk of pathogenic virus and bacteria of mobile phones used by healthcare workers. That detected common adenovirus and influenza virus as well as streptococci and staphylococci. Material: In this study was carried out in bacteriology laboratory at the "School of Biomedicine MNUMS". The research collected from the random methods and Mongolian National University of Medical Science‟s 80 students are participated and take a test sample that detected bacteria, them using smart phones. After all students from gave them a survey about usages and clean of smart phones. Results: The results revealed 66% of pathogenic bacterial contamination. Our survey was detected in 33 (63,5%) S.aureus, S.pneumoniae-5 (9.4%) E.coli 2 (3.8%) Bacillus, spp-4 (7.6%) Enterococcus-6 (11.5%) Acinetobacter-2 (3.8%). HOW TO CLEAN YOUR CELL PHONE? asked to total participate in this study. They said that they cleaned up their cell phones in 55.9% once every 3-7days, 11.9% once every 10-14 days and 32.2% once a month and more than. Conclution Are participated in this survey sample have been contaminated bacteria 66%. In total samples have been detected 63,5% in S.aureus and 11.5% in Enterococcus. So students‟ mobile phones may become rick high reservoir of microorganism for infections.

Background: Determining refractive errors among general education school students by age and gender Methods: The study was conducted using a cross-sectional model based on the examination records of 5,202 students from School No. 24 and School No. 37 by the ophthalmologist of the Chingeltei District Health Center in Ulaanbaatar. Results were analyzed SPSS. Result: The average age of all students included in the study was 11.37 ± 3.27 years. Among the participants, 62% (n = 3,208) were from School No. 24, and 38% (n = 1,994) were from School No. 37. Of the students from School No. 24, 18.6% (n = 597) had refractive errors. Specifically: Myopia was present in 17.2% (n = 552), with 6.1% male and 11.1% female. Hypermetropia was found in 0.68% (n = 22), with 0.43% male and 0.25% female. Astigmatism was detected in 0.72% (n = 23), with 0.34% male and 0.38% female. From School No. 37, 6.23% (n = 200) of students were diagnosed with refractive errors. Specifically: Myopia affected 5.23% (n = 168), with 1.96% male and 3.27% female. Hypermetropia was found in 0.16% (n = 5), with 0.07% male and 0.09% female. Astigmatism was present in 0.84% (n = 23), with 0.28% male and 0.56% female. There is a very weak negative correlation between myopia and age, as well as between myopia and gender, which is statistically significant. There is also a very weak negative correlation between astigmatism and age, which is statistically significant. Conclusion Our study found that among the types of refractive errors, myopia was the most common, with female students being more susceptible compared to males. The two schools included in the study represent both central (School No. 24) and peripheral (School No. 37) areas of Ulaanbaatar. Refractive errors were found to be more prevalent among students from the central school (School No. 24).