6th Grade · Science · Activity · shared by Luke Morgan
This free 6th Grade Science activity explores the skin microbiome, eczema, and microbial diversity, detailing their impact on human health.
Case Study: The Mystery of the Missing Microbes
Medical researchers at the City Children's Hospital have noticed a puzzling trend. In a recent study of 200 young patients, they found that children with healthy, clear skin had a wide variety of different bacteria living on their arms. However, children suffering from eczema —a condition that causes dry, itchy, and red patches of skin—had a much lower microbial diversity . This means they had fewer types of "good" bacteria and a much higher concentration of one specific harmful germ called Staphylococcus aureus.
The researchers discovered that when a child has high microbial diversity, the many different types of helpful bacteria work together. They produce protective peptides that keep the skin barrier strong and prevent irritation. In the eczema cases, the lack of variety among the microbes meant there weren't enough "security guard" bacteria like Staphylococcus epidermidis to produce these chemical weapons. Without these protectors, the skin barrier becomes weak, allowing moisture to escape and irritants to get inside, which triggers the painful immune response known as inflammation.
To help these patients, a group of pediatricians (doctors who treat children) and microbiologists (scientists who study tiny organisms) are testing a new approach. Instead of just using soaps to wash away all germs, they are looking for ways to restore the balance of the microbiome . They believe that increasing the number of helpful bacterial species on the skin will help the body heal itself. The families involved in the study are hopeful that understanding this invisible ecosystem will finally lead to relief for their children's itchy skin.