What is the definition of acute toxicity?

Acute toxicity refers to the harmful effects that occur following a single or short-term exposure to a substance, typically resulting in immediate health impacts. This definition aligns with the understanding that acute toxicity is characterized by symptoms and injuries that can emerge quickly after an individual is exposed to a toxic agent, such as a pesticide. These effects are often severe and can lead to significant health consequences, often requiring immediate medical attention.

In contrast, options focusing on long-term health effects, multiple exposures, and reversible effects do not align with the concept of acute toxicity. These terms relate to chronic toxicity, cumulative exposure effects, and the potential for healing over time, which are distinctly separate from the immediate, intense reaction associated with acute toxicity. This clarity is essential in the context of pesticide certification, as it underscores the importance of recognizing and responding to acute risks in the environment.