The probable cause for the relapsing nature of relapsing fever caused by Borrelia recurrentis is

The probable cause for the relapsing nature of relapsing fever caused by Borrelia recurrentis is



A. periodic spore dormancy and activation.
B. organisms that survive and propagate after spirochete-induced fever
C. the sequential appearance of new antibiotic resistant variants.
D. successive appearance of antigenic variants.
E. periodic hormonal fluctuations in the host.


Answer: D. successive appearance of antigenic variants.


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