Affect • Affected • Another • Carriers • Close • Constant • Contact • Contaminated • Density • Digestive • Direct • Does • Droplets • During • Easier • Emerge • Exchange • Facilitate • Flu • Genetic • Harbor • Increases • Individual • Infection • Lack • Larger • Likelihood • Limited • Limiting • Measures • More • Nutrients • One • Preventive • Recombination • Regions • Replication • Restricted • Seasonal • Solely • Specific • Spreading • Strains • Surfaces • Thus • Unknowingly • Urban • Viral • When • Yes