Immunity Page 242
More in Immunity
Is HIV a Pandemic? Global Reach and Why It Persists
HIV still affects millions worldwide. Learn why it qualifies as a pandemic, where it’s most prevalent, and what keeps it from being eradicated.
Is E. Coli Food Poisoning? Symptoms, Causes & Risks
Most E. coli strains are harmless, but some cause serious food poisoning. Learn what symptoms to expect, which foods carry the highest risk, and how to stay safe.
What Does Norovirus Do? Symptoms to Recovery
Norovirus hits fast and spreads easily. Learn what it does to your gut, why dehydration is the main concern, and how to recover safely at home.
What Color Is Allergy Snot: Clear vs. Yellow
Allergy snot is usually clear, but it can turn yellow. Here’s what your mucus color actually means and when to see a doctor.
Is Bacterial Gastroenteritis Contagious? Yes — Here’s How
Bacterial gastroenteritis spreads easily, but knowing when you’re contagious and how to avoid passing it on can protect the people around you.
How Do Women Get AIDS? HIV Routes and Prevention
Women face unique HIV risks due to biology and transmission routes. Learn how HIV spreads, what doesn’t transmit it, and how prevention and testing work.
What Do T Cells Produce in the Immune System
T cells produce cytokines, perforins, and other molecules to fight infection. Learn what each T cell type releases and what happens when things go wrong.
How Bad Is COVID Right Now? Severity and Long COVID
COVID still causes serious illness for many people, and long COVID remains a real risk. Here’s what the current evidence says about severity and immunity.
Is Eczema an Infection or Can It Become One?
Eczema isn’t an infection, but scratched skin can become one. Learn how to tell the difference and when to seek treatment.
What Is a Dairy Allergy? Symptoms, Causes & Treatment
Dairy allergies trigger immune reactions to milk proteins, not lactose. Learn what causes symptoms, how diagnosis works, and whether kids can outgrow it.
How to Shrink Lymph Nodes and When to See a Doctor
Swollen lymph nodes usually clear up on their own, but knowing when to see a doctor can make all the difference. Here’s what actually helps.
What Causes Inflamed Lymph Nodes and Warning Signs
Swollen lymph nodes are usually harmless, but certain signs like hard lumps or prolonged swelling may warrant a doctor visit. Here’s what to know.
What Makes Poison Ivy Itch So Bad?
Poison ivy’s itch comes from urushiol triggering your immune system. Learn why the rash spreads, how to stop it early, and why it’s getting more common.
Is Flu Type B Contagious? Spread, Timeline & Risk
Flu B spreads through droplets and contact, with people contagious a day before symptoms appear. Learn how long it lasts and how to protect others.