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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