The only useful ways to reduce the spread of<unk>  viruses are physical measures such as using correct hand washing technique and face masks; in the healthcare environment, gowns and disposable gloves are also used. Isolation or quarantine is not used as the disease is so widespread and symptoms are non-specific. There is no vaccine to protect against the<unk> . Vaccination has proven difficult as there are many viruses involved and they mutate rapidly. Creation of a broadly effective vaccine is, therefore, highly improbable. Regular hand washing appears to be effective in reducing the transmission of<unk>  viruses, especially among children. Whether the addition of antivirals or antibacterials to normal hand washing provides greater benefit is unknown. Wearing face masks when around people who are infected may be beneficial; however, there is insufficient evidence for maintaining a greater social distance. It is unclear if zinc supplements affect the likelihood of contracting a<unk> . Routine vitamin C supplements do not reduce the risk or severity of the<unk> , though they may reduce its duration. Gargling with water was found useful in one small trial.
Common cold
Whooping cough
Pontiac fever
Allergic rhinitis
Polymer fume fever
Sinusitis
Plague 
Bronchitis