複選題

25. Reasons affecting the efficacy of COVID-19 vaccines include ______ (Select all that apply.)
(A) no vaccine adjuvant is included in the vaccine
(B) only one serotype of SARS coronavirus (CoV)-2
(C) antibody response is waned(消退) over time
(D) survival of the infectious agent for long periods inside the host
(E) high mutation rates in the pathogen.

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