1. Upper Respiratory Tract Infection (URTI)

A. Acute pharyngitis
B. Acute laryngitis
C. Acute tonsillitis
D. Acute sinusitis
E. Acute epiglottitis

2. Low Respiratory Tract Infection (LRTI)

A. Acute bronchitis
B. Acute bronchopneumonia
C. Pneumonia

3. Causes：

A. Most often caused by a viral infection or a bacterial infection such as rhinovirus, adenovirus, parainfluenza virus that settles in the lungs
B. More and more has bacterial and mycoplasma combination infection, such as streptococcus pneumoniae, haemophilus influenzae, staphylococcus aureus, and mycoplasma

4. Precautions

A. Influenza vaccine: not only effective against the influenza virus, but also reduce the risk of getting other respiratory infection, including Avian Flu, SARS
B. Pneumococcal Vaccine: a vaccine against streptococcus pneumoniae, suitable for both elderly and children
C. Light diet
D. Well-balanced diet
E. Breathing exercise
F. Quit drinking and smoking
G. Enough rest, avoid drinking coffee or strong tea 6 hours before bedtimes

5. Treatment

A. Most infections are caused by virus, are a self-limited condition, normally last for 7-10 days
B. For some bacterial infections, white blood cells count will be elevated up to 10,000/mm3
C. Antibiotics might be used for some bacterial infections

6. Attention

A. Rest, do not go to work when you are sick
B. Do not smoke and stay away from smoking area
C. Increase intake of fruit juice; vitamin C boosts our immune system
D. Light diet, avoid oily and fatty food
E. Do aerobic exercise regularly if possible
F. Wearing mask to avoid spreading germs to others
G. Increase ventilation of an indoor space