📖 what
What is a vaccine?
ScienceHealthMedicine
Quick Answer
A vaccine is a preparation that trains the immune system to recognise and fight a specific germ without causing the disease itself.
The Full Story
A vaccine teaches the body defences to recognise a particular virus or bacterium in advance. It contains a harmless piece or weakened form of the germ — or instructions to make one — which prompts the immune system to build defences and memory cells. If the real pathogen appears later, the body can respond quickly and prevent illness. Vaccines have eradicated smallpox, nearly eliminated polio, and save an estimated several million lives every year worldwide.
Key Facts
1.Vaccines build immune memory without causing disease
2.They helped eradicate smallpox
3.They save several million lives a year
YouTube Angle
Suggested video title for this topic:
"What Is a Vaccine — Training Your Immune System"