Objective To explore the changes of plasma melatonin(MT)level in hypoxic-ischemic encephalopathy(HIE)neonates,and elucidate the function of rnelatonin in the pathogenesis and the prognosis of HIE.Methods Fourty HIE neonates were divided into 2 groups,20 mild HIE neonates and 20 moderate or severe HIE ones.The femoral vein blood were collected in 48 h and on 7 d after birth in mild HIE group,and in 48 h,on 7 d and(14±4)d after birth in moderate on severe HIE group.Twenty normal term infants served as control group.The level of plasma MT was determined with enzyme-labeled immunosorbent assay.Results Compared with control group[(8.003±1.840)ng/L],The MT level in mild HIE group in 48 h after birth[(13.311±4.025)ng/L]was higher(P＜0.01),but there was no difference on 7 d[(6.605±1.269)ng/L](P＞0.05);The MT level in moderate or severe HIE group in 48 h after birth[(5.487±1.997)ng/L]was lower(P＜0.01),but it was higher on 7 d[(16.201±5.594)ng/L](P＜0.01),there was no difference on(14±4)d[(6.799±1.765)ng/L](P＞0.05).Conclusion MT may have protective action on HIE.The prognosis of HIE with rising MT level in 48 h after birth is better than that with lower MT level.

Objective:To study the multi-locus sequence typing (MLST) gene characteristics of Brucella isolates in Guizhou Province. Methods:Brucella strains, which were isolated from 2017 to 2021 in Guizhou Province (preserved in the Bacterial and Viral Seed Bank of Guizhou Center for Disease Control and Prevention) were identified Brucella and species/types by BCSP31-PCR and AMOS-PCR methods, respectively. MLST method was used for genotyping, and Biometrics 8.0 software was used for cluster analysis of the typing results. Results:A total of 32 strains of Brucella were isolated in Guizhou Province and identified as Brucella melitensis ( B.melitensis) by BCSP31-PCR and AMOS-PCR methods. These strains were classified into 2 ST types (ST8 and ST39) by MLST method, with 28 strains of ST8 type(87.5%) and 4 strains of ST39 type (12.5%). The 28 strains of ST8 type were distributed in 7 cities (prefectures) of Guizhou Province, while the 4 strains of ST39 type were only found in Qianxinan Buyi and Miao Autonomous Prefecture. The cluster analysis results showed that ST8 and ST39 types strains were clustered in a group with the reference strain of B.melitensis, and there was only one nucleotide site difference between ST39 and ST8 types in the glk gene, indicating a close genetic relationship. Conclusions:B.melitensis is the main pathogen of the brucellosis epidemic in Guizhou Province in recent years. ST8 is the dominant MLST genotype in Guizhou Province.