When we talk about something spreading to a particular area, we often use the word "infects", which implies a negative connotation. However, there are many other synonyms for "spreads to" that can be used to describe the process in a more neutral or even positive light. For example, you could use words like diffuse, radiate, extend, or circulate to describe how something is spreading. These words have a more neutral or even positive connotation and could be used to describe the spread of ideas or positive actions. Other synonyms include disseminate, propagate, permeate, and proliferate, which imply a more intentional or organized spreading. Ultimately, the synonym that you choose will depend on the context and the tone that you want to convey.