susceptible

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susceptible

 [sŭ-sep´tĭ-b'l]
readily affected or acted upon; lacking immunity or resistance.

susceptible

adjective 
1. At risk of infection by a pathogen.
2. Able to be killed by a particular drug.

susceptible

liable to attack by another organism (pest or pathogen) or a biocide.

sus·cep·ti·ble

(sŭ-septi-bĕl)
Potential of a person to develop adverse effects from an external agent or influence.