Select the correct answer.
The smallest known type of infectious agent is:
A.
Rickettsias
B.
Protozoans
C.
Viruses
D.
All of the above
1 answer
C. Viruses
The smallest known type of infectious agent is:
A.
Rickettsias
B.
Protozoans
C.
Viruses
D.
All of the above
1 answer