Aspiration pneumonia bacterial infection history and symptoms

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Priyamvada Singh, M.D. [2]

The manifestation depends on:

• The bacteria involved
• Time since aspiration to diagnosis
• Immune status of the host

Symptoms in aerobic microbes

• Abrupt or Indolent course
• Productive cough
• Fever
• Absence of chills and rigors
• Dyspnea
• Anorexia, weight loss
• Anemia

Symptoms in anaerobic microbes

Clinical features, which are characteristic of aspiration pneumonia involving anaerobic bacteria, include:

• Indolent course
• Presence of risk factors: altered sensorium (anesthesia, alcohol, drug, trauma, dysphagia, dental caries)
• Putrid sputum
• Absence of chills and rigors