Which of the following is a prevention method to control disease transmission?

Improving hygiene is a fundamental prevention method in controlling disease transmission. By promoting practices such as regular hand washing, proper food preparation, and maintaining clean environments, the likelihood of pathogens spreading among individuals is significantly reduced. Good hygiene practices help to eliminate or decrease the presence of infectious agents in both community and healthcare settings. This proactive approach can effectively lower infection rates and prevent outbreaks, making it a critical component of public health strategies.

In contrast, while curative treatments, routine testing, and isolation of patients are important in managing diseases, they typically come into play after transmission has already occurred or when an infection is identified. Therefore, they do not serve primarily as preventive methods for controlling the spread of diseases in the same way that improving hygiene does.