Sentence:  Bats host many high-profile viruses that can infect humans, including severe acute respiratory <WSD>syndrome</WSD> and Ebola. A recent study explored the ecological variables that may contribute to bats' propensity to harbor such zoonotic diseases by comparing them with another order of common reservoir hosts: rodents. 
Meaning of the word marked with <WSD> tags:  A recognizable pattern of signs, symptoms and/or behaviours, especially of a disease or medical or psychological condition.