True drug allergy is often preceded by prior exposure, or sensitization, to the same or to a similar substance.
True drug allergy is often preceded by prior exposure, or sensitization, to the same or to a similar substance.
药物过敏发生前常有同一物质或类似物质的接触或致敏。
True drug allergy is often preceded by prior exposure, or sensitization, to the same or to a similar substance.
药物过敏发生前常有同一物质或类似物质的接触或致敏。