Pneumococcal disease refers to infections caused by the bacterium Streptococcus pneumoniae (pneumococci). They can cause both frequent infections (e.g., of sinuses, ears, lungs) and very severe, life-threatening invasive infections (e.g., sepsis, meningitis).
What causes it: bacterium (pneumococcus).
How infection occurs: most often through the respiratory tract – in contact with secretions during coughing/sneezing/talking.
Source of pathogen: human (sick person or asymptomatic carrier); carriage is particularly common in children attending nursery/kindergarten.
Incubation period: in the case of pneumococcal pneumonia usually approx. 1–3 days.
Who is most at risk: primarily children <2 years old and people ≥65 years old, and people with chronic diseases and/or reduced immunity (e.g., diabetes, chronic heart/lung/liver diseases).
2. Symptoms of pneumococcal disease
Symptoms depend on which organ has been affected. The disease can range from mild infections to a state of direct threat to life.
Possible complications: in some patients, severe consequences occur (e.g., neurological complications after meningitis, permanent organ damage); otitis media can even lead to permanent hearing impairment.
When is urgent medical consultation / ER necessary: severe shortness of breath, chest pain, disturbances of consciousness, stiff neck, very high fever with chills, symptoms of sepsis (rapid deterioration of condition, confusion, rapid breathing/pulse), and always in infants, seniors, and people with reduced immunity.
3. Where does pneumococcal disease occur?
These are infections occurring all over the world – they are not "exotic". For travelers, it is important that the risk increases in situations favoring respiratory transmission, e.g., in crowded places and in closed communities (schools, nurseries/kindergartens, nursing homes).
4. How to protect yourself against pneumococcal disease?
A. General prevention
hand hygiene and "cough etiquette" (covering mouth/nose, disposable tissues),
ventilating rooms and avoiding close contact with clearly sick people,
taking care of treatment of chronic diseases and general immunity,
in smokers – considering limiting/quitting tobacco (smoking increases the risk of severe respiratory infections).
B. Vaccination (most important)
Vaccinations against pneumococci are an important way of limiting the risk of severe infection and complications. In Poland, conjugated vaccines (PCV) and polysaccharide vaccines (PPSV23) are used.
Types of vaccines (generally):
PCV (conjugated) – used in children (from 6 weeks of age), adolescents, and adults; protect against the most important forms of pneumococcal disease in the range of serotypes contained in a given preparation.
PPSV23 (polysaccharide 23-valent) – mainly in adults (depending on indications), especially in the elderly and in risk groups.
Who is especially recommended for vaccination?
children (vaccination in the vaccination calendar),
people ≥65 years old, especially with chronic diseases (including heart, lungs, liver, diabetes) or other risk factors,
people with reduced immunity / after some procedures (individual qualification).
Vaccination schedule
Children (PSO 2025): PCV doses at age 2 months, 4 months, and 13–15 months.
Adults (especially risk groups): in practice, among others, the following are used:
1 dose of PCV20 (without the need to administer PPSV23 after PCV20 – in a typical schedule)
or PCV (e.g., PCV13/PCV15) + PPSV23 at an interval of at least 8 weeks (in selected situations); in some patients with immunodeficiencies, another dose of PPSV23 may be considered after 5 years. (Selection of the schedule depends on age, comorbidities, and history of previous vaccinations.)
Duration of immunity
Protection lasts for several years, and the need for booster doses depends on the type of vaccine and risk factors (therefore, the decision should be based on medical qualification and current recommendations for a given group).
Safety
Vaccines are usually well tolerated. Most often, mild, short-term symptoms occur, e.g., pain/swelling at the injection site, malaise, sometimes fever.
Practical note: in Poland, some seniors (65+) from risk groups may have reimbursed/free vaccination according to applicable rules.
5. Summary
Pneumococci can cause frequent infections (sinuses, ears, lungs), but also very dangerous infections, such as sepsis or meningitis. Most at risk are small children as well as elderly and chronically ill people. Vaccination helps reduce the risk of severe course and complications, and the schedule is selected for age and risk factors. If you are planning a trip (or autumn-winter season), it is best to consider vaccination in advance – at least a few weeks earlier, to make it in time with qualification and development of protection.