Page 267 - (DK) I Can’t Believe It! 2

TRUE OR FALSE? 265

More than 200 different Sinuses are air-flowing spaces
viruses can cause the behind the forehead, nasal
common cold, with cavity, and eyes. Extra mucus Which
symptoms including secreted during a cold can other reason
sneezing, sore throats, block up the sinuses, causing for sneezing
and blocked noses. stuffiness and headaches.
affects
20 percent
After days of battle, of people?
the body’s defenses are
triumphant. The hard-
working mucus layer
has caught and disabled
the viruses, while
protective white blood
cells clean up the debris.

Up to 80 percent of
colds are caused by a
group of viruses called
rhinoviruses (“nose
viruses”). These tiny
viruses are just 30 millionths
of a millimeter wide.

Cold viruses exist in the air we breathe.
When they enter the nose, the virus
enters your system. The viruses irritate
the nasal lining, triggering an automatic
reflex action—sneezing. As the sneeze
blasts thousands of tiny droplets into
the air, other people become infected.

US_264_265_309600_illness.indd 265 19/12/17 3:48 pm