Signs and Symptoms
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Haemophilus influenzae can cause many different kinds of infections. Symptoms depend on the part of the body that is infected.
Pneumonia
Symptoms of pneumonia usually include:
- Fever and chills
- Cough
- Shortness of breath or difficulty breathing
- Sweating
- Chest pain
- Headache
- Muscle pain or aches
- Excessive tiredness
Bloodstream infection
Symptoms of bloodstream infection usually include:
- Fever and chills
- Excessive tiredness
- Pain in the belly
- Nausea with or without vomiting
- Diarrhea
- Anxiety
- Shortness of breath or difficulty breathing
- Altered mental status (confusion)
A bloodstream infection from H. influenzae can occur with or without pneumonia.
Symptoms of meningitis typically include sudden onset of:
- Fever
- Headache
- Stiff neck
- Nausea with or without vomiting
- Photophobia (eyes being more sensitive to light)
- Altered mental status (confusion)
Babies with meningitis may:
- Be irritable
- Vomit
- Feed poorly
- Appear to be slow or inactive
- Have abnormal reflexes
Page last reviewed: March 4, 2022