Assiya Marat Issayeva is the author of 31 scientific articles, including 9 articles in journals recommended by the Committee for Control in Education and Science of the Ministry of Education and Science of the Republic of Kazakhstan, 9 articles in journals of the Higher Attestation Commission. 3 articles in journals indexed in SCOPUS (Q1, Q3) and 3 publications in international conference proceedings. H-index is 3. In 2021, she presented together with Yeralieva L.T. poster presentation at the ESPID-39 conference (Switzerland, Geneva). Since 2019, the scientific mentor of Assiya Issayeva is Doctor of Medical Sciences, Professor Yeralieva L.T. (jointly published 10 scientific articles). From 2018 to 2021, she was a specialist of the scientific department of JSC "Central Clinical Hospital" at the Medical Center of the Administration of the President of the Republic of Kazakhstan.

At the international scientific conference "Farabi alemi" Issayeva Assiya under the guidance of scientific supervisors Gulnur Z. Tanbayeva (Doctor of Medical Sciences, Professor, MBA, Al-Farabi State Prize Laureate in the field of technology and science) and Lyazzat T. Yeraliyeva (Doctor of Medicine, Professor, Corresponding Member of the Russian Academy of Natural Sciences, Deputy Director for Clinical and Scientific Work of the RSE on REM "National Scientific Center for Phthisiopulmonology of the Republic of Kazakhstan" of the Ministry of Health of the Republic of Kazakhstan) made a presentation on the topic "Analysis of morbidity and mortality from pneumonia in children under 1 year old from 2010 to 2020 in the Republic of Kazakhstan”. In her report, Assiya Marat presented the results of a study of the analysis of the dynamics of incidence and mortality of pneumonia in children under 1 year of age in the Republic of Kazakhstan for 10 years since the introduction of vaccination against pneumococcal infection in the National Immunization Schedule of the Republic of Kazakhstan in 2010. From 2010 to 2020, the incidence of pneumonia in children under 1 year of age tends to decrease in absolute numbers. In 2010, this indicator was 17,761 cases of morbidity, and in 2020, the indicator decreased by 52.1% compared to 2010, and amounted to 8493 cases. The conducted studies allowed the authors to conclude that with the introduction of vaccination against pneumococcal infection in the national vaccination schedule of the Republic of Kazakhstan in 2010, there is a clear trend towards a decrease in the incidence of pneumonia in children under 1 year old from 2010 to 2020 from 54.1 to 20.1 cases. per 1000 people. This work was carried out as part of the master's work of Issayeva Assiya entitled "The impact of the COVID-19 pandemic on the implementation of preventive measures in the clinic on the example of vaccination against pneumococcal infection."