Wilma Weekworm explains: Virus & Co

Poor Wilma Weekworm has a runny nose and a cough. Her head is very hot and she doesn't feel well at all. Wilma Weekworm is sick. Her friend, the doctor worm, Sebastian Splendid, explains: A virus probably gave her this runny nose. And because Wilma is a clever worm, she naturally wants to know exactly: What is a virus? Why can viruses make you sick? How do you get well again? How can you avoid g...