The World Book Encyclopedia, Tom 4Field Enterprises Educational Corporation, 1960 |
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Strona 185
... disease . But not all infec- tious diseases are contagious . For example , malaria and yellow fever must be transmitted by insects , and infec- tious arthritis is not spread from person to person . The germ theory of infectious disease ...
... disease . But not all infec- tious diseases are contagious . For example , malaria and yellow fever must be transmitted by insects , and infec- tious arthritis is not spread from person to person . The germ theory of infectious disease ...
Strona 188
DISEASE , CONTROL OF flies by keeping garbage covered and storing manure in closed pits . Fly poison also may be used . Animals that carry disease germs must be killed . Human carriers and mild cases of disease call for special measures ...
DISEASE , CONTROL OF flies by keeping garbage covered and storing manure in closed pits . Fly poison also may be used . Animals that carry disease germs must be killed . Human carriers and mild cases of disease call for special measures ...
Strona 189
... disease called the bends . This ailment may also affect skindivers and deep - sea divers . See BENDS . Chemicals used in industry cause many occupational diseases . The worker may get these chemicals on his skin or inhale them into the ...
... disease called the bends . This ailment may also affect skindivers and deep - sea divers . See BENDS . Chemicals used in industry cause many occupational diseases . The worker may get these chemicals on his skin or inhale them into the ...
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