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The world is full of tiny viruses and bacteria that can be seen only through a microscope. Some bacteria can be helpful, but others cause diseases such as typhoid fever. Viruses can cause deadly diseases such as COVID-19. In this book, readers will get all the facts about bacteria and viruses, including their similarities and differences, how they cause infections, and how people can keep dangerous germs from spreading.
The world is full of tiny viruses and bacteria that can be seen only through a microscope. Some bacteria can be helpful, but others cause diseases such as typhoid fever. Viruses can cause deadly diseases such as COVID-19. In this book, readers will get all the facts about bacteria and viruses, including their similarities and differences, how they cause infections, and how people can keep dangerous germs from spreading.