Legionnaire’s disease is an acute respiratory infection that can do major damage to the upper respiratory tracts, particularly due to the heavy, hacking coughs that often accompany the infection. Anise seed tea is used to help reduce the amount of phlegm or mucus present in the tracts, which makes it easier to breathe, and also eliminates the key locations where the infection can spread. Furthermore, the active ingredients in anise seed tea have anti-inflammatory properties that can soothe the throat and the affected areas of the respiratory system, thus speeding the healing process.