an instrument that makes small objects look larger
microscope
a slight illness that a lot of people catch, causing a cough, sore throat, and blocked nose
common cold
protected from a disease
immune (to)
a thick liquid produced inside the nose and other parts of the body
mucus
unable to move
paralyzed
an extremely small piece of organic material that causes disease in humans, animals, and plants
virus
another word for "flu"
influenza
very small organisms that are found everywhere and are the cause of many diseases
bacteria
give someone a disease
infect
smallest unit of life
cells