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Onset of illness
Symptoms for pneumonia typically include, cough, fatigue, chills, and shortness of breath. Each of the symptoms occurs with different frequencies.
Cough and fatigue are the most common symptoms, and seen in up to 9 out of 10 cases. Fever and shortness of breath, are present in roughly 3 out of 4 people. Productive sputum is present in 65 percent of cases, and chest pain occurs in roughly one-half of people.
In the elderly, confusion may be the most prominent sign, and fever is less likely to be present.
Children Early Symptoms
In children under the age of five, fever, cough, and fast or difficult breathing are the most common symptoms.
Children Severe Pneumonia
Pneumonia fills the lung's alveoli with fluid, limiting how much oxygen can be absorbed. The alveolus on the left is normal, whereas the one on the right is full of fluid from pneumonia.
Diagnosis - Other Methods
Where (and how) a pneumonia was acquired, can have a profound impact on survival. Examples are community-acquired, or hospital-acquired pneumonia. 
Other methods of prevention, include smoking cessation, and treating underlying illnesses (such as diabetes and HIV) properly.
Pneumonia is a common illness, affecting approximately 450 million people a year, and occurring in all parts of the world. It is a major cause of death among all age groups, resulting in 7% of the world's total death yearly.
Death rates, are greatest in children less than five, and adults older than 75 years.
With the introduction of antibiotics and vaccines in the 20th century, survival has improved.
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