T-Cell Responses after Rotavirus Infection or Vaccination in Children: A Systematic Review

Area of Science:

• Immunology
• Pediatrics
• Virology

Background:

• Cellular immunity against rotavirus in children remains poorly understood.
• T-cell immunity is crucial for viral infections, but its role in pediatric rotavirus is unclear.

Purpose of the Study:

• To review the current understanding of T-cell immunity to rotavirus in children.
• To identify gaps in knowledge and suggest future research directions.

Main Methods:

• A systematic literature search was performed across major databases (Embase, MEDLINE, Web of Science, Global Health).
• Keywords included "t-cell", "rotavirus", and "child" for articles published between January 1973 and March 2020.
• Seventeen relevant articles were identified and analyzed.

Main Results:

• Rotavirus-specific T-cell immunity in children develops with age and shows broader reactivity.
• T-cell responses are transient, can occur without antibodies, and are predominantly gut-homing (Th1, cytotoxic subsets), potentially influenced by IL-10 Tregs.
• Pediatric T-cell responses are generally low-frequency in peripheral blood and limited compared to adults and other pathogens.

Conclusions:

• Pediatric T-cell responses to rotavirus are characterized by low frequencies and transient nature.
• Further research is essential to investigate the protective associations of these T-cell responses against rotavirus infection and vaccination.
• Standardization of rotavirus-specific T-cell assays in children is needed.