73.引起魚類疾病之病原多為伺機性病原(opportunistic pathogen),下列何者為專性病原(obligate pathogen)?
(A)Aeromonas hydrophila
(B)Myxococcus piscicola
(C)Bacillus subtilis
(D)Aeromonas salmonicida

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統計: A(37), B(63), C(45), D(162), E(0) #1180708

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(A)Aeromonas hydroph...
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