The day of a successful vaccination – level 1


Smallpox is a very dangerous illness. It kills people. Cowpox is also an illness but it isn’t so dangerous.

Edward Jenner is a doctor. He sees that people who catch cowpox are immune to smallpox.

On May 14, 1796, Jenner takes material from cowpox and injects it into the arm of a small boy.

After that, the boy has a fever, but he isn’t very ill. He is also immune to smallpox.

The Jenner’s vaccine is successful.

The word “vaccine” comes from the Latin word for cow, “vacca.”

Difficult words: smallpox (a dangerous disease which can kill people), cowpox (a disease of cows and sometimes people), immune (resistant to a disease), inject (to use a needle to put a drug into a body).

What did the Latin word "vacca" mean?


Days in Levels is designed to teach you 3000 words in English. Please follow the instructions

How to improve your English with Days in Levels: 


  1. Do the test at Test Languages.
  2. Go to your level. Go to Level 1 if you know 1-1000 words. Go to Level 2 if you know 1000-2000 words. Go to Level 3 if you know 2000-3000 words.


  1. Read two new articles article at Days in Levels every day.
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