Antigenic shifts and phase variants are important virulence assets for which bacteria?

Antigenic shifts and phase variants are important virulence assets for which bacteria? 



a. E. coli and Vibrio cholera.
b. Clostridium tetani and Bacillus anthracis
c. Neisseria gonorrhoeae and Salmonella spp.
d. Streptococcus pneumonia and Staphylococcus aureus
e. Helicobacter pylori and Enterobacter cloacae


Answer: Neisseria gonorrhoeae and Salmonella spp.


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