Background: Contact dermatitis and also allergic skin diseases are increasing and is becoming problem among Mongolian dental technicians. Serum total IgE and patch testing for contact allergy are needed to confirm the diagnosis. Methods: The aim of this study was to determine and discuss the results of patch tests (potassium dichromate, cobalt chloride hexahydrate and nickel sulfate) and allergic reaction (serum total IgE titer) in dental technicians. Results: In this cross-sectional study, fifty dental technicians were enrolled, aged between 25-52 years and fifty healthy students of dentistry school participated, who were aged 18-32 years. The mean average age of dental technicians was 34.4±0.91. Serum total IgE levels in dental technicians were significantly higher (p=0.03) than dental students group. Serum total IgE have direct, strong correlation with patch testing results (r=-0.759, p>0.001) in group of dental technicians. The most prevalent positive reaction was to nickel sulfate (7; 43.75%). Conclusion Due to the complex etiology of skin allergic diseases in dental technicians with suspected allergy, detailed diagnostics should be carried out in order to enable identification of allergenic substances and their elimination from the dental technician’s occupational condition.

Background: The first confirmed case of COVID-19 in Mongolia was reported on November 11, 2020. In response, the government imposed a nationwide lockdown, which significantly impacted the population’s mental health. Heightened levels of stress, anxiety, loneliness, and depression during the pandemic altered individuals’ psychological stability and behavior. Personality traits—defined as relatively stable patterns of emotion, cognition, and behavior—play a key role in stress responses and emotional regulation under pressure. Emerging evidence suggests that these psychological factors may influence the immune system’s responsiveness, including vaccine-induced antibody production. Aim: To evaluate the association between post-vaccination antibody responses and personality types following two doses of COVID-19 vaccines. Materials and Methods: A total of 738 participants who received two doses of COVID-19 vaccines (AstraZeneca ChAdOx1, n=29; Pfizer-BioNTech, n=119; Sinopharm BBIBP, n=590) and had no prior SARS-CoV-2 infection were enrolled. Serum samples were collected 21–28 days after the second dose, and SARS-CoV-2 RBD (S) IgG antibodies were measured using ELISA (Proteintech Inc., USA). Personality types were assessed using a 56-item temperament questionnaire developed by A. Belov, categorizing individuals into classical temperament types (choleric, phlegmatic, sanguine, melancholic). Logistic regression and ROC analysis were used to examine associations between personality types and antibody response. Results: The presence of an antibody response was significantly higher among individuals with a melancholic tempera ment, and significantly lower among those with a phlegmatic temperament. Furthermore, antibody titers were higher in participants with melancholic and sanguine temperaments and lower in those with a phlegmatic type. Conclusions 1. During the early period following the second dose of COVID-19 vaccination, the antibody response was higher in individuals with a pure melancholic temperament, while it was lower in those with a phlegmatic temperament. 2. After the second dose of the Sinopharm BBIBP COVID-19 vaccine, antibody titers were higher in individuals with pure melancholic and sanguine temperaments, and lower in those with a phlegmatic temperament.