A common disease caused by an infection with the influenza virus. It is characterized by symptoms such as a fever over 38℃, a headache, joint pain, muscle pain and general malaise.

Norovirus, a very contagious virus that can cause acute gastroenteritis, is usually spread through the fingers and foods. Once inside the body, it proliferates in the intestinal tract, causing symptoms such as vomiting, diarrhea, and abdominal pain.

Streptococcus pneumoniae (S. pneumoniae) is a bacteria that is normally present at the back of the nose and throat, but when triggered may cause otitis media (inflammation of the middle ear), rhinosinusitis (inflammation of the nasal passages and sinus cavities), bronchitis, pneumonia, septicemia, and meningitis etc.

An infection with group A hemolytic streptococci can cause a wide variety of diseases, such as acute pharyngitis (inflammation of the pharynx), tonsillitis, impetigo (a bacterial skin infection), or scarlet fever as a special disease type.