Latent tuberculosis infection (LTBI) is defined as a patient is infected with Mycobacterium tuberculosis, without signs and symptoms or radiographic evidence of tuberculosis (TB). Until recently, the only test to identify latent tuberculosis infection was the tuberculin skin test (TST). But in BCG-vaceinated or non-mycobacterium tuberculosis infected individuals TST may be false positive and some babies or immunocompromised individuals have negative results on TST even they were proved to be with TB disease. So it is in need of a new method with higher sensitivity and specificity to diagnose LTBi. More recently, a new diagnostic method of interferon gamma release assays (IGRA) was paid close attention, and in some countries it replaced TST and became the final diagnostic method of LTBI. IGRA has high specificity for Mycobacterium tuberculosis without being influenced by BCG vaccinated or non-mycobacterium tuberculosis infection. In people with normal immune systems, the sensitivity of IGRA is same as TST for TB disease, and in immunocompromised individuals the sensitivity of IGRA is higher than TST. IGRA will have important application in diagnosis of LTBI although it cannot absolutely take the place of TST.

In order to evaluate the changes in T cell subsets after acute irradiation injury, and investigate the mechanism of deficiency of cellular immunity in acute irradiation syndrome, Balb/c mice were exposed to a single total body irradiation of 5Gy gamma rays from a 60 Co source. On days 10, 28 and 120, the amounts of CD4 + and CD8 + subsets in spleen cells were evaluated by flow cytometry (FCM), and expression of IL 4 gene in ConA stimulated spleen cells was evaluated by reverse transcription linked polymerase chain reaction, in which ?-actin gene was used as an internal control. It was found that after irradiation, the ratio of CD4 + /CD8 + became significantly higher than that of the controls, and then the ratio lowered gradually until day 120. However, it still did not return to the level of the controls. On day 10, expression of IL 4 gene at mRNA level increased significantly. The results indicated that CD8 + subset was more radiosensitive than CD4 + , and the pattern of cytokine seeretion shifted to that of Th2 soon after irradiation.

Objective:To understand the clinical research knowledge, attitude and practice of pediatrics residents in standardized residency training, and to provide scientific basis for improving their capability of clinical medical scientific research.Methods:A self-complied questionnaire survey including demographic information, knowledge and attitudes toward capability of medical scientific research as well as personal interview was conducted in 22 pediatric residents during the standardized residency training from April to July, 2017. Data were analyzed by (mean±standard deviation) and percentage for description, and qualitative data were analyzed by classification and induction. SPSS 18.0 was used to analyze the data.Results:Firstly, the total score of basic knowledge in clinical scientific research was (54.14±23.06), with the scores between 31 and 60 being the most. Secondly, all these residents believed that capability of clinical medical scientific research was very important for them and clinical research training was necessary for them during the standardized residency training. Thirdly, the residents had the scientific research practices but no article published during the standardized residency training. Fourthly, the residents hoped to improve their capability of clinical scientific research by various means during the training.Conclusion:It is indicated that basic knowledge on capability of clinical medical research is still insufficient in standardized residency training of pediatrics residents, so relevant measures should be taken to cultivate their capability of clinical scientific research.

Objective To explore application on improving basic knowledge of clinical scientific research based on PDCA circle in the standardized training of pediatrics residents and to provide scientific basis for improving the capability of clinical scientific research in standardized training of pediatrics residents. Methods Based on previous research results, the training courses of improving the capability of clinical scientific research based on conception of PDCA were practiced . The examination of basic knowledge of clinical scientific research before and after training and satisfaction questionnaire in pattern, contents , time arrangements as well as effect of training courses were conducted among 22 pediatrics residents from April to July, 2017. Data were analyzed using Mean, Standard deviation and proportion for description and the data before and after training were given a independent-sample t test. The training courses were taken for 3 months. Results ①Compared with the training courses before, the average scores of basic knowledge in capability of clinical scientific research were improved after training [(54.14±23.06) vs. (73.63±21.05)]. ②Insufficiency of some basic clinical scientific research knowledge still existed and there was no statistical difference between the results before and after the training in those areas. ③ In the standardized training, pediatrics residents were satisfied with the pattern, contents and results of training courses, except for the time arrangement. Conclusion The training courses based on PDCA circle can significantly improve the capability of clinical scientific research in the standardized training of pediatrics residents.