hm 
. 
t of water which shows the pressace of a Gem negative motile red 
rerasntiag lactose 8 how would you further study it to prove wee 
absence of Escherichia coli? 
in the country with flush toilets s how would you provide for sewage 
1 piping it to a nearby stream were undesirable? 
stulates and the experimental difficulties encountered in fulfilling 
J 
a — - 
rinelpal mechanisms which prevent the entrance of bacteria into the 
What cells clear the blood of invading bacteria? Where do these 
late after ingestion of the bacteria? 
:e 8 invasiveness* minimal lethal dose, average lethal dose* What 
: thuds are used to increase virulence of a culture of pathogenic 
antibody* complement* simple hapten, complex hapten* Contrast 
endotoxins* 
an adequately ©quinoed labor* «***■■«» »*«* •*'* — ~ J 
