[Proliferative activity of lymphocytes of peripheral blood in infectious mononucleosis in children]

Area of Science:

• Immunology
• Infectious Diseases
• Cell Biology

Background:

• Infectious mononucleosis (IM) presents diagnostic challenges, particularly differentiating viral from bacterial etiologies.
• Lymphocyte proliferative activity is a key indicator of immune system response.
• Understanding lymphocyte behavior in IM can provide diagnostic insights.

Purpose of the Study:

• To investigate lymphocyte proliferative activity as a diagnostic marker for differentiating viral and bacterial infectious mononucleosis.
• To analyze changes in lymphocyte blastogenesis in response to specific stimuli (PHA and LPS) in different stages of IM.

Main Methods:

• Peripheral blood lymphocytes were isolated from patients with viral and bacterial IM, and healthy children.
• Lymphocyte proliferative activity was assessed using blast transformation assays stimulated by phytohemagglutinin (PHA) and lipopolysaccharide (LPS).
• Comparative analysis of lymphocyte responses was performed across disease stages (acute, convalescence) and between etiological groups.

Main Results:

• Viral IM exhibited significantly lower lymphocyte blast transformation in response to PHA during the acute phase compared to healthy controls.
• During convalescence from viral IM, lymphocyte responses to LPS increased, while PHA responses remained altered before eventually normalizing.
• Bacterial IM showed normal lymphocyte proliferative activity in response to both PHA and LPS stimulation throughout the study.

Conclusions:

• Lymphocyte proliferative activity, particularly in response to PHA and LPS, can serve as an additional diagnostic criterion for distinguishing viral from bacterial infectious mononucleosis.
• The distinct patterns of lymphocyte blastogenesis observed in viral IM offer a potential method for etiological diagnosis and monitoring immune recovery.