Symptoms can start in as short as one to three days after contact with an infected person and can vary depending on where the bacteria enter the body.
If the bacterium enters the lungs, it can cause pneumococcal pneumonia. Common symptoms include sudden onset of high fever, chills, chest pain, difficulty breathing, increased heart rate, and a cough. In infants and young children, symptoms may include fever, vomiting, and seizures.
If the bacterium enters the bloodstream, it can cause bacteremia. Common symptoms include high fever, muscle aches/pain, fatigue, and sleepiness.
If the bacterium enters the lining of the brain and spinal cord, it can cause meningitis. Common symptoms include headache, high fever, stiff neck, vomiting, confusion, and sensitivity to light. In small children, symptoms may include fever, irritability, poor appetite, and sleepiness.