Background: Govi-Altai Province is located in an arid region of Mongolia with limited water resources, where the main sources of drinking water are groundwater and springs. Therefore, regular assessment of water quality is essential for protecting public health and ensuring sustainable management of water resources. The Mongolian Standard MNS 0900:2018 “Drinking Water. Hygienic Requirements, Quality and Safety Assessment” provides the theoretical basis for this study and establishes criteria for evaluating physicochemical properties of drinking water. Previous studies reported high hardness, mineralization, and heavy metal content in some soums, occasionally exceeding MNS limits, yet long-term systematic studies are scarce. The study hypothesizes that “certain chemical parameters in drinking water of Govi-Altai soums may exceed the maximum allowable standard limits. Aim: To evaluate the physicochemical parameters of drinking water in the sums of Govi-Altai Province during 2019– 2024 and to assess hygienic risks by comparing the results with the MNS 0900:2018 standard Material and Methods: This study analyzed 112 drinking water samples collected from 2019 to 2024. Major physicochemical parameters were assessed and compared with MNS 0900:2018 standards. Results: The average pH of the soums’ water was approximately 7.3, within the standard range. However, water hardness was high in some soums (Bigēr 17.4 mg-eq/L, Tsogt 8.7 mg-eq/L), exceeding recommended levels. Nitrate reached up to 60 mg/L, fluoride 2.1 mg/L, and iron 0.9 mg/L, with some soums exceeding standard limits, indicating potential health risks. Water from Yesonbulag soum complied with standard hardness limits, demonstrating variability in water quality across the province. Comparison with studies from Inner Mongolia and Ulaanbaatar highlights differences in hardness, mineral content, and heavy metal levels. Conclusion Physicochemical parameters in drinking water from some Govi-Altai soums exceed standard limits, and high water hardness may pose public health risks.

Introduction: Coronavirus infection 2019 (Ковид-19) is an infection caused by a novel virus and induces severe ARDS. КОВИД-19 pandemic has rapidly spreaded in 221 countries, 245,373,039 cases and 4,979,421 mortalities have been reported. Pulmonary and renal thrombotic angiopathy occur in patients with complications of ARDS, sepsis, and multi-organ failure. Elevated D-dimer in КОВИД-19 patients has been reported firstly by doctors in Wuhan, China. In addition, many studies have revealed that elevated D-dimer has been associated with the severity of the diseases, an increased rate of poor prognosis. Objective: We aim to determine D-dimer in КОВИД-19 patients, and patient condition a decrease of D-dimer level after administration of anticoagulant therapy. Case report: We introduce a rare case of КОВИД-19. Laboratory test results and the effect of anticoagulant therapy have been evaluated during the infection. 85 aged women were admitted with a diagnosis other than КОВИД-19. PCR for SARS-Cov-2 was negative on the previous day of admission, and Sars-Cov-2 Ag rapid test was also negative on the admission day. However, the D-dimer test result was much higher with 7120 ng/мл and X-ray and CT revealed a similar pattern to the КОВИД-19 patient. Then anti-Sars-Cov-2 test was positive with 4,08 COI. Based on laboratory test results of D-dimer, LDH, CRP, and CT pattern the patient was diagnosed with post-КОВИД-19 pneumonia, and anticoagulant therapy was initiated additionally to prevent hypercoagulation induced by КОВИД-19. D-dimer test taken before administration of anticoagulant therapy increased more to 10910 ng/мл. 3 days later D-dimer level decreased to 8180ng/мл and the patient’s condition was improved. Conclusion The evaluation of D-dimer of the patients with КОВИД-19 is highly significant. Anticoagulant therapy might be necessary for КОВИД-19 patients with high D-dimer level in serum. Further studies are needed to assess the long-term outcome of the illness and mortality.