Objective. To investigate the correlation between serum immune factor levels and allergic constitution in children with infectious mononucleosis. Methods. A total of 120 children who visited our hospital from March, 2019, to December, 2020, were selected as the research objects, and 40 children who came to our hospital for physical examination were included in the control group (CG). 40 children with IM were classified into the IM group (IG), and 40 IM children with allergic rhinitis, allergic dermatitis, asthma, and other allergic diseases were classified into the IM allergy group (AG). On the second day of admission, 5 ml of fasting venous blood was collected from all children in the early morning to observe the serum IgE level, the level of lymphocyte subsets, and the level of immunoglobulin of the patient. Results. The serum CD3, CD4, and CD8 levels of children in AG were significantly higher than those in IG and CG ( P < 0.05 ). The serum IgE, IgA, IgM, and IgG levels of children in AG were significantly higher than those of IG and CG ( P < 0.05 ). The serum IgE levels of children in AG were positively correlated with the serum CD3, CD4, and CD8 levels ( P < 0.05 ). There was a positive correlation between the serum IgE level and serum IgA, IgM, and IgG levels in children with AG ( P < 0.05 ). Conclusion. The results of this study showed that there may be a certain relationship between allergic constitution and the incidence, clinical manifestations, and prognosis of infectious mononucleosis. IgE level can be used as a reference index for the early severity of IM clinical symptoms.

Purpose. To observe the correlation between nutritional status, bone age, and sexual development in children and adolescents. Methods. 895 children and adolescents who underwent physical examination in the growth and development clinic and height clinic of our hospital from 2019 to 2021 were selected as the research objects. The subjects were divided into emaciation group, normal group, overweight group, and obesity group. The bone age level, bone age assessment, sexual development, and early maturity rate of each group were compared. Results. The bone age difference (BAD) of the overweight and obesity groups was higher than that of the normal group, and the BAD of the obesity group was higher than that of the emaciation group ( P < 0.05 ). Compared with the normal group, the risk of advancement of bone age in the overweight group increased by 2.674 times (male) and 1.908 times (female), the risk of advancement of bone age in the obesity group increased by 6.376 times (male) and 14.687 times (female), the risk of retardation of bone age in the emaciation group increased by 2.150 times (male) and 3.092 times (female). Whether it was male or female, the sexual development of overweight and obese was higher than that of the normal weight group in the same age group. Among female children, the sexual precocious puberty rate of the overweight + obesity group is higher. Conclusion. The nutritional status of children and adolescents is closely related to their bone age and sexual development.