The phrase "contributed to spreading" is correct and usable in written English.
You can use this phrase to describe an action taken by someone that is related to disseminating or propagating something. For example, "Her enthusiasm for the project contributed to spreading the word about it."
Having contributed to spreading the word about the two directors' previous films -- Boyle's Oscar-winning Slumdog Millionaire and Aronofsky's The Wrestler -- by screening them during Denver's 2008 event, festival officials "put 127 Hours and Black Swan at the top of our list to pursue for this year," Erickson said.
Our analyses indicate that migratory birds, poultry trade, and transportation may all have contributed to spreading the H9N2 virus in China.
Studies in many countries have demonstrated that workers in these trades have contributed to spreading the HIV epidemic from high risk groups to the general female population [ 34, 35].
In spite of the natural occurrence of heavy metals as rare elements, diverse anthropogenic practices have contributed to spread them in the environment.
Postal Service officials said yesterday that the traditional means of cleaning -- blowing compressed air into the machines -- could contribute to spreading bacteria or spores and was being immediately changed.
The UNESCO committee maintains a list of practices from around the world that contribute to spreading the knowledge of intangible cultural heritage and promoting awareness of its importance.
Chronically infected animals are sources of recurrent infections and contribute to spreading S. aureus to other cows and herds.
In addition, MVs may contribute to spreading certain infective agents, such as human immunodeficiency virus type 1.
Restriction modification systems would stabilize the element, and the mobile element would contribute to spreading of the restriction modification systems.
