Final answer:
Continuous exposure to fleas in flea allergic dermatitis (FAD) does not favor tolerance, while intermittent exposure does.
Step-by-step explanation:
In the case of flea allergic dermatitis (FAD), continuous exposure to fleas often worsens the symptoms and makes it difficult for the body to develop tolerance. Fleas carry allergens that trigger an allergic reaction in sensitive individuals. Continuous exposure to these allergens can lead to persistent itching, inflammation, and skin lesions.
On the other hand, intermittent exposure to fleas favors tolerance. When the body is exposed to fleas intermittently, it has more time to recover and gradually develop a tolerance to the allergens. This can help reduce the severity of allergic reactions and improve the overall condition of individuals with FAD.