Chapter 27, Problem 4TY

 Place the following steps in the correct order, according to Koch’s postulates:

I.    Determine if pure cultures of bacteria cause disease symptoms when introduced to a healthy host.

II.    Determine if disease symptoms correlate with presence of a suspected pathogen.

III.    Isolate the suspected pathogen and grow it in pure culture, free of other possible pathogens.

 IV.    Attempt to isolate pathogen from second-infected hosts.

1. a. II, III, IV, I
2. b. II, IV, III, I
3. c. Ill, II, I, IV
4. d. II, III, I, IV
5. e. I, II, III, IV