[Risk factors for iron deficiency anemia in infants aged 6 to 12 months and its effects on neuropsychological development].

OBJECTIVE: To study the risk factors for moderate and severe iron deficiency anemia (IDA) in infants aged 6-12 months, and to preliminarily investigate the effects of IDA on the neuromotor development and temperament characteristics of infants. METHODS: A total of 326 infants aged 6-12 months with IDA were classified into three groups: mild IDA (n=176), moderate IDA (n=111), and severe IDA (n=39) according to the severity of anemia. The risk factors for moderate or severe IDA were investigated by multivariate logistic regression analysis. Three hundred and forty-six infants without IDA who showed matched age, sex, and other backgrounds were selected as the control group. The Gesell Development Diagnosis Scale was used to evaluate children's mental development. The Temperament Scale for infants was used for evaluating children's temperament. RESULTS: The univariate analysis showed that the severity of IDA was associated with sex, birth weight, gestational age, multiple birth, maternal anemia during pregnancy, and mother's lack of knowledge about IDA (P<0.05). Setting the mild IDA group as control, the multivariate logistic regression analysis showed that multiple birth, premature birth, low birth weight (<2500 g), maternal anemia during pregnancy, breast feeding, and mother's lack of knowledge about IDA were the risk factors for severe IDA (OR>1; P<0.05); premature birth, breast feeding, and mixed feeding were the risk factors for moderate IDA (OR>1; P<0.05). The IDA group had significantly lower scores in Gesell general development quotient, gross motor, adaptive behavior, and fine motor than the control group (P<0.05). The IDA group had higher percentages of children with difficulty and intermediate difficulty temperaments than the control group (P<0.05). The IDA group had significantly higher scores in activity level, rhythmicity, adaptability, and perseverance than the control group (P<0.05). CONCLUSIONS: The severity of IDA is associated with premature birth, multiple birth, low birth weight, feeding pattern, maternal anemia during pregnancy and mother's lack of knowledge about IDA in infants aged 6-12 months. Infants with IDA have delayed neuromotor development and most of them have negative temperaments. More attention should be paid to mental and behavior problems for the infants. It is necessary to provide guidance for their parents in feeding and education.

[Relationship between G6PD deficiency and hand-foot-mouth disease induced by enterovirus 71].

OBJECTIVE: To study the influence of glucose-6-phosphate dehydrogenase (G6PD) deficiency on hand-foot-mouth disease (HFMD) induced by enterovirus 71 (EV71) , and possible mechanisms. METHODS: A total of 220 boys with HFMD induced by EV71 were classified into two groups based on disease severity: mild/moderate (n=145) and severe HFMD groups (n=75), and 132 healthy boys were selected as the control group. The activity of G6PD and levels of reduced glutathione (GSH) and malonaldehyde (MDA) in blood were measured using the automatic biochemical analyzer. RESULTS: The percentage of G6PD deficiency cases in the severe HFMD group was significantly higher than in the control group (P<0.0125). In the severe HFMD group, the durations of fever, mental abnormality, limb trembling and hospital stay were significantly longer in children with G6PD deficiency than in those with normal G6PD activity (P<0.05). In the acute and recovery stages, patients in the mild/moderate and severe HFMD groups had significantly lower GSH levels and G6PD activity and significantly higher MDA levels compared with those in the control group (P<0.05). In the acute stage, children in the mild/moderate and severe HFMD groups with G6PD deficiency had significantly lower GSH levels and significantly higher MDA levels compared with those with normal G6PD activity (P<0.01). In the acute and recovery stages, GSH level in children with HFMD was positively correlated with G6PD activity (r=0.61, P<0.01; r=0.58, P<0.01), and in the acute stage, MDA level was negatively correlated with G6PD activity (r=-0.29, P<0.01). CONCLUSIONS: G6PD deficiency is probably a predisposing factor for HFMD induced by EV71 and may aggravate the patient's condition. Its mechanism might be related to oxidative stress.

[Spectrum of pathogens for community-acquired pneumonia in children].

OBJECTIVE: To investigate the spectrum of pathogens for community-acquired pneumonia (CAP) in children, and to provide a basis for the diagnosis and treatment of CAP. METHODS: Respiratory secretions and venous blood samples were collected from 1560 children with CAP aged from one month to 9 years within 2 hours after admission, for detection of multiple pathogens. Respiratory virus antigens in nasopharyngeal swab specimens were detected by immunofluorescence. Sputum was used for bacterial culture. Levels of Mycoplasma pneumoniae (MP)-IgM and Chlamydia pneumoniae (CP)-IgM in venous blood were measured by enzyme-linked immunosorbent assay. RESULTS: A total of 579 strains of bacteria were isolated from all respiratory secretions, including 213 (36.8%) Gram-positive strains and 366 (63.2%) Gram-negative strains. The five most common strains were Haemophilus influenzae (7.50%), Streptococcus pneumoniae (6.73%), Staphylococcus aureus (6.35%), Moraxella catarrhalis (5.19%), and Escherichia coli (3.46%), wherein the beta-lactamase-producing strains accounted for 3.3% of all strains. The non-bacterial pathogens mainly included respiratory syncytial virus (12.88%), MP (7.88%), and CP (8.91%). Mixed infection of pathogens was serious, and the mixed infection of respiratory syncytial virus with Haemophilus influenzae infections were the most common. For most pathogens, the infection rate was higher in children aged under one year than in those aged over one year. CONCLUSIONS: Haemophilus influenzae, respiratory syncytial virus, MP and CP are the main pathogens for children with CAP. For most pathogens, the infection rate is higher in children aged under one year than in those aged over one year. Mixed infection rate of pathogens is high.