Objective To study the IgG antibodies on red cell surface in ABO and Rh-incompatible infants and to evaluate its predictive value for hemolysis. Methods From Nov. 2001 to Jul. 2002,50 full term newborn babies with ABO and Rh incompatibility hemolysis were admitted .They were divided into two groups according to the direct Coombs test(DCT): 38 cases with positive result and 12 cases were negative. Another 30 normal newborns were chosen as control group. Erythrocyte associated IgG,A and M were measured by a flow cytometry (FCM). Results the mean level of concentration of IgG antibodies in positive DCT group was (12.64?16.83)%,while (4.54?2.54)% in negative DCT group ( P 427.5 ?mol/L,IgG was elevated with the increased TSB level. There was a close relationship between the concentration of TSB and IgG ( r =0.678). Conclusion Measurement of erythrocyte surface antigen IgG assists the diagnosis of maternal-fetal incompatible hemolysis,especially when with a positive direct Coombs test result.

5 mm had surgery in 100%. Conclusion Most severe CHD could be detected prenatally by fetal echocardiography, and the pregnancy should be terminated. The critical NCHD should be diagnosed by echocardiography for corrective or palliative surgery as early as possible in the first days of life. In mild cases of left to right shunts may close spontaneously, they should be followed up regularly.

Objective To observe the effect of intravenous immune globulin (IVIG) therapy on newborn infants of Rh hemolytic disease. Methods IVIG group (n=14) received conventional treatments including albumin administration and phototherapy with additional IVIG therapy at a daily dose of 400 mg/kg given for 1～5 consecutive days,and control group (n=16) only received conventional treatments. Effects were compared between the two groups. Result There were 25 patients with hyperbilirubinemia caused by Rh hemolytic disease received exchange transfusions. IVIG was infused in 12 cases,100% of them had the total serum bilirubin level dropped down during the treatment before the exchange transfusions, vs 5 (38%) of 13 cases in control group (P

Objective To determine the incidence of bacterial infection in neonates due to group B streptococcus(GBS) in our hospital. Methods The specimens were collected from 141 neonatal infants with infectious symptoms and maternal risk factors. 93 blood and 6 CSF samples were performed bacterial culture.141 blood sera, 65 urine and 6 CSF samples were tested for GBS antigen by countercurrent immunoelectrophoresis(CIE). Results In 141 neonatal infants, 27 cases were found GBS polysaccharide antigen positive(19.1%). Blood and CSF culture were positive only in 1 case. In 27 cases , there were 2 cases with meningitis, 6 cases with sepsis, 12 cases with infectious pneumonia , 2 cases with omphalitis, and 5 cases were only premature babies .There were 20 cases of early onset disease and 7 cases of late onset disease. There was one case that the same serotype(III/R) and DNA genes of GBS were found in the blood and CSF cultures of baby and his mother's vaginal swab culture . The antibacterial activity was found in the urine specimens of 32/34 cases in the first day on admission by micrococcus inhibition test, only 2 cases were negative. All patients were treated with Penicillin and Ampicillin. Conclusions (1)GBS is one of the pathogens in neonatal infection.(2)CIE method for identification of GBS polysaccharide antigen is sensitive and specific.(3)Penicillin was the first choice for neonatal GBS infection.

Objective To observe the therapeutic effects of intravenous immunoglobulin (IVIG) between the higher dose (1 g/kg) and the lower dose (400 mg/(kg?d)1~3 d) for severe ABO hemolytic disease of newborn. Methods 48 term infants with severe hyperbilirubinemia receiving IVIG were divided into 2 groups. 24 cases in group A with higher dose, while 24 cases in group B with lower dose, another 20 cases without IVIG in the control group C. Phototherapy were used concomitantly for all infants in these 3 groups. The days of life on admission, the days of jaundice appearance, and the peak of serum bilirubin concentration (TB) in each group were macthed. The theraputic effects in TB reduced between each group were compared. Results The infants admitted on the 1st day of life in group A,B,and C were 11, 11, and 8 cases respectively, the range of TB(MTB) in the 3 groups were 230~237?mol/L (13.5~13.9 mg/dl). After treatment, the MTB declined to 203?mol/L (12 mg/dl) in group A within 24hrs, vs 285~316 ?mol/L (17~18 mg/dl) in group B and C,P

n CMV-IgM.

Objective To analyse the associated clinical findings of newborn infants with HIE after intrauterine asphyxia with normal Apgar scores at birth and follow-up the neurologic sequelae. Methods 30 newborn infants admitted for HIE in Jan.to Dec. 2002 were analysed,they had :(1)intra-uterine asphyxia with Apgar scores of 8～10 at birth,(2)with neurological symptoms on the first day after birth,(3)diseases of infection,genetics and metabolism,and deformity were ruled out,(4)with characteristic findings of HIE on cranial ultrasound examinations and CT scans. Results All of 30 newborn infants had signs of depression from the first day after birth,22 infants of them sometimes were irritable.17 cases (56.7%) with mild encephalopathy and 13 cases (43.3%) with moderate encephalopathy,none of severe case,compared with the infants who had HIE with birth asphyxia,there were no statistical difference. Less than 40% cases had elevated BUN and CKMB,hyponatremia,hypocalcemia,hypoglycemia,acidosis,etc The incidence of them were the same as the infants who had HIE with birth asphyxia. The findings of cranial ultrasound examinations were different between the acute and chronic hypoxic injury of intrauterine asphyxia Follow-up 28 infants at the mean age of (11.7?3.8) months. Except 1 case of cerebral palsy,all of them are normal intelligent infants. There were 4 cases of dilated lateral ventricle and 1 case of dilated 3rd ventricle at birth; 6 cases of dilated ventricles found in follow-up and 1 of them had cerebral palsy,all of those infants recovered at 12～19 months of age. Conclusion Newborn infants who had intrauterine asphyxia without birth asphyxia might suffer from HIE and cerebral palsy later. Cranial ultrasound examinations showed some of them had fetal brain damages. Therefore,intensive care of such infants,preventing and treating intrauterine asphyxia could decrease the morbidity of HIE.

Objective To investigate the cellular immune state and pathological mechanism of HBV chronic infection by analyzing the cytokines produced by peripheral blood mononuclear cells(PBMCs) of asymptomatic HBV carriers.Methods PBMCs were prepared from diagnosed chronic asymptomatic HBV individuals and cultured in the presence of different antigens and antibodies.The levels of IFN-?,IL-12,TNF-?,TGF-? and IL-10 in the culture supernatants were respectively detected by ELISA.Results The levels of IFN-?,IL-12 were significantly lower than in the counterparts from healthy controls;meanwhile,those of TGF-? and IL-10 were elevated markedly.Neutralization of TGF-? and IL-10 simultaneously restore the IFN-? production from PBMCs of HBV carriers,and exogenous IL-12 in low dose combined with specific HBV antigens promoted IFN-? production.Conclusion Reduction of IL-12 from PBMCs may be the fundamental reason of viral persistence in HBV chronic carriers,combined IL-12 and specific HBV antigen promoted the celluar immunity of PBMCs from HBV carriers.

Objective: To investigate a cluster of coronavirus disease 2019(COVID-19)caused by latent infection in Haikou,so as to provide reference for the prevention and control of COVID-19 clusters. Methods: An epidemiological investigation was conducted according to the COVID-19 Prevention and Control Program(Fourth Edition). The course of diagnosis and treatment,clinical characteristics and field investigation data were collected to analyze the transmission chain and the intergeneration between cases. Results : Among 39 people involved,five confirmed cases and two asymptomatic infections were found,with an attack rate of 17.95%. The cases aged from 40 to 65 years and lived in the dormitories near the farm of Dongshan. The first case(named Case 1)closely contacted with a confirmed case of COVID-19 in Chengmai from January 28 to February 10,was isolated on February 13 and developed symptoms on February 16. The other six cases(Case 2 to Case 7)shared the water source with Case 1 from January 28 to February 13(within the incubation period of Case 1). They needed to open the power switch outside Case 1's room and the water valve in Case 1's washroom before the use of water. They might be infected by contacting the doorknob and the water valve contacted by Case 1,or by the aerosol formed after Case 1 used the washroom,then infected each other when living together. The onset of Case 2 to Case 7 was earlier than Case 1,and they had no travelling history in Hubei Province 14 days before and contacted no confirmed cases except Case 1. Therefore,Case 1 was the source of the cluster during his incubation period of COVID-19. Conclusion This was a cluster of COVID-19 due to latent transmission by living in the same area and touching the same objects indirectly,which indicated that COVID-19 was infectious in the incubation period.