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Serum amyloid a, C-reactive protein, and procalcitonin levels in children with Mycoplasma pneumoniae infection. 2022

Yuanyuan Jiang, and Wenyang Wang, and Zhijun Zhang, and Xianfen Ma, and Yanyan Sang, and Jin Wang, and Guoxiang Xu, and Qiang Feng, and Shuping Zhao
Department of Clinical Laboratory, Taian City Central Hospital, Shandong, China.

BACKGROUND Mycoplasma pneumoniae (MP) is a common pathogen of community-acquired pneumonia in children. In the present study, serum amyloid A (SAA), C-reactive protein (CRP), and procalcitonin (PCT) levels in children with MP infection were analyzed and the differential diagnoses of MP evaluated. METHODS The study included 152 children with MP infection hospitalized in Tai'an Central Hospital in Shandong Province and 50 healthy children as controls. SAA, CRP, and PCT, as well as serum immunoglobulins and T lymphocyte subsets were analyzed during the acute and convalescent phases. Among the MP-infected children, 30 cases were selected to monitor the SAA, immunoglobulins, and T lymphocyte subset levels for a week. RESULTS The SAA, CRP, PCT, IgA, and IgM levels were significantly higher in the MP-infected group than in the control group (F(SAA) = 83.91, p < 0.05; F(CRP) = 40.79, p < 0.05; F(PCT) = 60.58, p < 0.05; F(IgA) = 43.45, p < 0.05; F(IgM) = 233.88, p < 0.05). In addition, the levels of these factors were significantly higher in the acute phase than in the convalescent phase (p < 0.05). However, significant difference was not observed in the IgG level between these two groups (p > 0.05). The CD3+ and CD4+ levels in the MP-infected group were lower than in the control group ( F(CD3+) = 60.58, P < 0.05; F(CD4+) = 89.05, p < 0.05), and the CD8+ level was higher than in the control group ( F(CD8+) = 96.96, p < 0.05). The CD3+ , CD4+ , and CD8+ levels were significantly different between the acute phase and the convalescent phase (CD3+ : acute phase vs. convalescent phase, q = 2.79, p < 0.05; CD4+ : acute phase vs. convalescent phase, q = 2.83, p < 0.05; CD8+ : acute phase vs. convalescent phase, q = 3.15, p < 0.05). The changes in serum SAA levels in the MP-infected group positively correlated with the changes in IgA, IgM, and CD8+ levels and negatively correlated with CD3+ , CD4+ , and CD4+ /CD8+ . CONCLUSIONS SAA, CRP, and PCT were specific markers for diagnosing early MP infection in children. These findings are important in the differential diagnosis of MP infection and clinical guidance for MP treatment.

UI MeSH Term Description Entries
D009177 Mycoplasma pneumoniae Short filamentous organism of the genus Mycoplasma, which binds firmly to the cells of the respiratory epithelium. It is one of the etiologic agents of non-viral primary atypical pneumonia in man. Eaton Agent
D011019 Pneumonia, Mycoplasma Interstitial pneumonia caused by extensive infection of the lungs (LUNG) and BRONCHI, particularly the lower lobes of the lungs, by MYCOPLASMA PNEUMONIAE in humans. In SHEEP, it is caused by MYCOPLASMA OVIPNEUMONIAE. In CATTLE, it may be caused by MYCOPLASMA DISPAR. Mycoplasma Pneumonia,Pneumonia, Primary Atypical,Mycoplasma dispar Infection,Mycoplasma ovipneumoniae Infection,Mycoplasma pneumoniae Infection,Atypical Pneumonia, Primary,Atypical Pneumonias, Primary,Mycoplasma Pneumonias,Mycoplasma dispar Infections,Mycoplasma ovipneumoniae Infections,Mycoplasma pneumoniae Infections,Pneumonias, Mycoplasma,Pneumonias, Primary Atypical,Primary Atypical Pneumonia,Primary Atypical Pneumonias
D002097 C-Reactive Protein A plasma protein that circulates in increased amounts during inflammation and after tissue damage. C-Reactive Protein measured by more sensitive methods often for coronary heart disease risk assessment is referred to as High Sensitivity C-Reactive Protein (hs-CRP). High Sensitivity C-Reactive Protein,hs-CRP,hsCRP,C Reactive Protein,High Sensitivity C Reactive Protein
D002648 Child A person 6 to 12 years of age. An individual 2 to 5 years old is CHILD, PRESCHOOL. Children
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000077740 Procalcitonin A peptide prohormone precursor of CALCITONIN. It is normally present at low levels in serum, but is released into the bloodstream, primarily from neuroendocrine cells in the lungs and intestines, in response to INFLAMMATION and BACTERIAL INFECTIONS. It is a diagnostic marker for BACTEREMIA. Calcitonin Precursor Polyprotein,Calcitonin Related Polypeptide Alpha,Calcitonin-1,Pro-Calcitonin,Calcitonin 1
D000685 Serum Amyloid A Protein An ACUTE PHASE REACTION protein present in low concentrations in normal sera, but found at higher concentrations in sera of older persons and in patients with AMYLOIDOSIS. It is the circulating precusor of amyloid A protein, which is found deposited in AA type AMYLOID FIBRILS. Amyloid Protein SAA,Amyloid Serum Protein SAA,Serum A Related Protein,Amyloid A Precursor,Amyloid A Protein,Amyloid A Protein-Related Serum Component,Amyloid Fibril Protein AA,Amyloid Protein AA,Amyloid Protein AA Precursor,Amyloid-Related Serum Protein (SAA),Serum Amyloid A,Serum Amyloid Protein A,Amyloid A Protein Related Serum Component

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