Signs and Symptoms

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)

Bloodstream infection from H. influenzae can occur with or without pneumonia.

Meningitis

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, or appear to be slow or inactive. In young babies, doctors may also test the child’s reflexes, which can be abnormal with meningitis.

Page last reviewed: February 13, 2020