When something is "going like wildfire", it means that it's spreading quickly and rapidly. There are a variety of synonyms and similar phrases that can be used to convey the same sentiment. One common alternative is "spreading like a virus", which refers to how quickly a disease can spread. Another option is "spreading like wildfire", which is similar but with the added emphasis on the speed of the spread. Other phrases that can be used include "propagating rapidly", "covering like a blanket", "dispersing swiftly", and "enveloping quickly". No matter which synonym is used, the sense of something spreading quickly will always be expressed.