Which of the following is a pathogen?
a. foreign material
b. bacteria
c. biruses
d. all are pathogens
Answer: D
Which of the following is a pathogen?
a. foreign material
b. bacteria
c. biruses
d. all are pathogens
Answer: D
a. foreign material
b. bacteria
c. biruses
d. all are pathogens
Answer: D
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