When assessing the risk of infection for clients, which factor is most important?

The most important factor to consider when assessing the risk of infection for clients is the client's medical history. This is because a thorough understanding of a client's medical background can reveal potential vulnerabilities, such as weakened immune systems, chronic illnesses, or skin conditions that may increase the risk of infection. Knowledge of any existing conditions, allergies, or medications being taken is crucial in helping nail technicians take the necessary precautions to protect both the client and themselves during treatments.

While a client's age can affect overall health, and a client's economic status might impact their access to healthcare, neither is as directly pertinent to the immediate risk of infection in the context of nail services as their medical history. Additionally, the client's dress style does not provide relevant information regarding their risk for infection.