Oswaldo Cruz

Hello, my name is Oswaldo Cruz. I want to tell you the story of my life and how I used science to help people. I was born in a beautiful country called Brazil on August 5th, 1872. My father was a doctor, and I was always fascinated by his work, especially his microscope. I would spend hours looking through it at the tiny, invisible worlds swimming in a single drop of water. Seeing all that life made me dream of becoming a doctor, too. I wanted to understand how to help people who were sick and make them healthy again.

When I grew up, I became a doctor just as I had dreamed. In 1896, I traveled all the way across the ocean to a city called Paris to study at a very special school, the Pasteur Institute. There, I learned all about tiny living things called germs that can get inside our bodies and make us very sick. When I returned home to Brazil, the big city of Rio de Janeiro had a huge problem. Many people were getting sick from serious diseases like yellow fever and smallpox. In 1903, the leader of Brazil gave me a very important job. He asked me to be the country's main doctor and find a way to get rid of these sicknesses for good.

I had a new idea that many people didn't believe at first. I was sure that yellow fever was spread by pesky mosquitoes! To stop them, I created special teams called 'sanitary brigades.' These teams went all over the city, cleaning the streets and getting rid of any standing water where mosquitoes could lay their eggs. I also knew that a special shot called a vaccine could stop smallpox. In 1904, a new rule said that everyone had to get the vaccine to stay safe. Some people were scared and angry about this rule, and there was even a big protest called the 'Vaccine Revolt.' It was a difficult time, but I knew that science and cleanliness were the best ways to keep everyone healthy.

All of our hard work paid off. By 1907, we had won the fight against yellow fever in the city. The institute I started to study diseases and create vaccines is still helping people in Brazil today. It is now called the Oswaldo Cruz Foundation, or Fiocruz, in my honor. I lived to be 44 years old, and I spent my life using science to make my home a healthier and safer place. Today, I am remembered in Brazil as a doctor who fought for public health and showed how we can all work together to defeat even the scariest diseases.