11-30
A teaching aid for showing how germs
invade the body
When people are learning how infection
spreads, and how it invades the body, it helps
if they can actually ‘see’ what happens. For
this purpose, the village health team in Ajoya
invented the following teaching aid. By pulling
different cardboard strips, students can actually
see the ‘germs’ move in through the nose and
attack the different parts of the respiratory
syWsteHmO.LE TEACHING AID ASSEMBLED
FOUR MOVABLE STRIPS
TINY RED DOTS
(BACTERIA)
RED (INFLAMMATION)
YELLOW (POCKETS OF PUS)
STIFF
CARDBOARD
YELLOW
RED (INFLAMMATION)
(POCKETS OF PUS IN LUNGS)
Fasten the strips to the back of the
drawing, using paper ‘belt loops’
through which the strips can slide.
By pulling the different strips in the direction of the arrows, you can see the
bacteria invade, followed by inflammation, and then infection with pus.
PULL STRIP 1, AND SEE
THE GERMS BEGIN TO
ENTER THE NOSE.
PULL STRIP
2, AND THEY
INVADE THE
SINUSES. ..
AND CAUSE
INFLAMMATION.
FINALLY
THERE ARE
POCKETS
OF PUS.
Pull strip 1 farther and the germs will invade the ear, and form pus. Pull strip 3 to
show an infection of the voice box, and then the tubes in the lungs (bronchitis). Pull
strip 4A and the infection reaches the tiny air sacs of the lungs, causing pneumonia.
Pull strip 4B and a pocket of pus forms in the lower right lung.