Related Experiment Video

Updated: Dec 21, 2025

Noninvasive Sampling of Mucosal Lining Fluid for the Quantification of In Vivo Upper Airway Immune-mediator Levels
05:31

Noninvasive Sampling of Mucosal Lining Fluid for the Quantification of In Vivo Upper Airway Immune-mediator Levels

Published on: August 7, 2017

10.7K

Reflection on lower rates of COVID-19 in children: Does childhood immunizations offer unexpected protection?

Jinglu Lyu1, Tianyu Miao2, Jiajia Dong2

  • 1State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China; Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing 210008, China.

Medical Hypotheses
|May 20, 2020
PubMed

Insights

Children exhibit milder COVID-19 symptoms and lower infection rates due to unique immune system characteristics. This suggests potential benefits from existing vaccines like BCG, influenza, and pneumococcal for enhancing immunity in vulnerable populations.

Area of Science:

  • Immunology
  • Virology
  • Pediatrics

Background:

  • COVID-19 incidence in children is low (approx. 2%) with generally mild symptoms.
  • Children, typically vulnerable to respiratory pathogens, show atypical COVID-19/SARS-like virus severity.
  • Differences in cellular immunity between children and adults may explain these clinical observations.

Purpose of the Study:

  • To investigate the reasons behind the atypical clinical manifestations of COVID-19 in children.
  • To explore the potential of existing vaccines to enhance immunity against COVID-19 in specific populations.

Main Methods:

  • Analysis of pathological studies on COVID-19 and SARS focusing on T lymphocyte counts.
  • Comparison of cellular immune system differences between children and adults.
  • Review of the impact of childhood vaccinations and infections on immune responses.

Main Results:

  • Children's immune systems may possess trained immunity, immune fitness, or cross-protection from prior exposures.
  • T-lymphocyte reduction is a key factor in severe COVID-19/SARS, but less pronounced in children.
  • Existing vaccines (tuberculosis, influenza, pneumonia) may offer protective potential.

Conclusions:

  • Children's unique immune profiles contribute to milder COVID-19 outcomes.
  • Vaccines like BCG, influenza, and pneumococcal vaccines warrant consideration for healthcare workers.
  • Further research is needed to explore leveraging planned immunization for trained immunity in high-risk adults.

Keywords:
COVID-19Childhood immunizationImmune fitnessMild symptom in childrenTrained immunity

More Related Videos

Assessing Respiratory Immune Responses to Haemophilus Influenzae06:32

Assessing Respiratory Immune Responses to Haemophilus Influenzae

Published on: June 29, 2021

2.4K
An In vitro Model to Study Immune Responses of Human Peripheral Blood Mononuclear Cells to Human Respiratory Syncytial Virus Infection09:01

An In vitro Model to Study Immune Responses of Human Peripheral Blood Mononuclear Cells to Human Respiratory Syncytial Virus Infection

Published on: December 10, 2013

8.2K

Related Concept Videos

Vaccinations01:51

Vaccinations

Overview
50.8K
Pharmacokinetics in Pediatric Patients: Overview and Drug Absorption01:23

Pharmacokinetics in Pediatric Patients: Overview and Drug Absorption

Understanding the physiological differences in the pediatric population is crucial for effective pharmacotherapy. Neonates, infants, and children exhibit significant variations in gastric pH, gastric emptying time, intestinal transit time, and biliary function. These variations profoundly affect oral drug absorption, necessitating a nuanced approach to pediatric dosing.Neonates present with a unique physiological profile, having a gastric pH greater than 4 and faster and more irregular gastric...
167
Pharmacokinetics in Pediatric Patients: Drug Excretion01:26

Pharmacokinetics in Pediatric Patients: Drug Excretion

In pediatric medicine, understanding the renal function and drug elimination nuances is crucial for administering safe and effective treatments. Newborns, in particular, display markedly slower renal functions than adults, profoundly affecting how drugs are cleared from their bodies. This slower drug clearance requires clinicians to extend the dosing intervals for many medications to prevent drug accumulation and toxicity while ensuring therapeutic efficacy.One key area where these adjustments...
147
Pharmacokinetics in Pediatric Patients: Drug Distribution01:17

Pharmacokinetics in Pediatric Patients: Drug Distribution

Drug distribution in the pediatric population exhibits unique challenges and considerations due to the physiological differences between children, particularly neonates and infants, and adults. A crucial aspect of pediatric pharmacology is understanding how these differences impact the pharmacokinetics of various drugs, necessitating age-specific dosing strategies to ensure efficacy and safety.Neonates and infants have a higher total body water content, ~75%–90% of their body weight,...
190
Factors Affecting the Risk of Infection01:26

Factors Affecting the Risk of Infection

The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin...
13.1K
Pharmacokinetics in Pediatric Patients: Drug Metabolism01:24

Pharmacokinetics in Pediatric Patients: Drug Metabolism

In pediatric care, understanding the nuances of hepatic drug metabolism is crucial, as it significantly differs from that of adults. This divergence is primarily due to the developmental stage of drug-metabolizing enzymes, which affects how medications are processed in the body. In neonates, for instance, the activity of Phase I enzymes—critical for the initial breakdown of drugs—is markedly reduced, functioning at just 20–40% of the levels seen in adults. This reduction poses...
126