Bacterium

Bordetella pertussis

Bacterium
Bordetella pertussis

Spectrum of activity:

bactericidal

Transmission route:

Direct contact Droplets or aerosols, mainly short-range transmission Indirect contact

Hygiene measures:

Basic hygiene (hands and surface) Droplet isolation (short-range transmission)

At a glance

Bordetella pertussis is a Gram-negative, aerobic rod-shaped bacterium belonging to the family Alcaligenaceae and is the primary causative agent of whooping cough (pertussis), a highly contagious respiratory disease. The bacterium infects humans exclusively and colonises the ciliated epithelial cells of the upper respiratory tract. It produces various toxins, including pertussis toxin, which contribute significantly to the characteristic symptoms and the course of the disease [1, 2].

Despite the widespread availability of vaccines, pertussis continues to pose a significant public health challenge worldwide. Recurring outbreaks continue to occur due to waning immunity following vaccination or natural infection, incomplete vaccination coverage, as well as improved diagnostics and increased vigilance. Infants who cannot yet be fully vaccinated are at the highest risk of severe disease, hospital admissions and deaths [3, 4].

In detail

Symptoms

The incubation period for an infection with Bordetella pertussis is usually 7 to 10 days. The disease typically progresses in three stages.

The first stage, known as the catarrhal stage, resembles a common upper respiratory tract infection and is characterised by a runny nose, a mild cough, sneezing and a slight fever. As the symptoms in this phase are non-specific, pertussis often goes unrecognised, even though infected individuals are already highly contagious and contribute significantly to the further spread of the disease [4, 1].

After one to two weeks, the disease progresses to the paroxysmal stage. In this phase, severe, uncontrollable coughing fits occur repeatedly, which may be accompanied by the characteristic whooping sound on inhalation. The violent coughing fits can lead to vomiting, sleep disturbances, breathing difficulties and severe exhaustion. In young infants , the typical wheezing is often absent. Instead, apnoea and cyanosis may occur, making pertussis particularly dangerous in this age group [3, 4].

The final stage, the convalescence phase, is characterised by a gradual decrease in the frequency and severity of the coughing fits. However, recovery is often protracted, and coughing fits may continue for weeks or even months, particularly following secondary respiratory tract infections. Due to this prolonged course, pertussis is often referred to as the ‘100-day cough’ [4, 5].

Routes of transmission

Humans are the only known reservoir of Bordetella pertussis. Transmission occurs mainly via respiratory droplets released when coughing, sneezing or speaking. The bacterium spreads very efficiently through close interpersonal contact and is therefore frequently transmitted within families, in schools, nurseries and healthcare settings. As the initial symptoms resemble those of a common cold, infected individuals often spread the pathogen unnoticed before a diagnosis is made [6, 4].

Contagiousness is highest during the early catarrhal stage and in the first few weeks after the onset of the cough. Without antibiotic treatment, infected individuals may remain infectious for up to three weeks after the onset of the characteristic cough. Early antimicrobial therapy can significantly shorten the duration of contagiousness and help to curb further spread [2].

Distribution

Pertussis occurs worldwide and, despite the availability of vaccines, remains a significant infectious disease. Humans are the only known reservoir of the pathogen. Transmission occurs primarily via respiratory droplets during close contact between people. Due to the non-specific early symptoms, the disease is often already spreading before a diagnosis is made [3].

Measures to prevent infection

Vaccination is the most effective measure for preventing pertussis and its complications. The World Health Organisation (WHO) recommends routine immunisation of children with pertussis-containing vaccines from early infancy, as well as booster doses in accordance with national vaccination guidelines. In many countries, vaccination during pregnancy is also recommended, as maternal antibodies provide passive protection to newborns during the first few months of life, before the primary immunisation course can be completed [3].

Further preventive measures include a high vaccination coverage rate in the population, the timely administration of booster doses, and diagnosis as early as possible. People with suspected or confirmed pertussis should observe respiratory hygiene measures, avoid close contact with particularly vulnerable individuals such as infants, and receive appropriate antibiotic treatment where indicated. These measures reduce both the transmission of the disease and the risk of outbreaks in community settings and healthcare facilities [6, 4].

From a hygiene perspective, hand disinfection and surface disinfection using products with proven bactericidal efficacy can help prevent infection in healthcare settings. Although pertussis is primarily transmitted via respiratory droplets, appropriate hygiene measures form an important part of comprehensive prevention strategies [2].

Sources

  1. Centres for Disease Control and Prevention (CDC). Clinical Overview of Pertussis. Updated 2025.
    https://www.cdc.gov/pertussis/hcp/clinical-overview/ (accessed on 8 July 2026)
  2. Robert Koch Institute (RKI). RKI Guide to Whooping Cough (Pertussis). Updated 2025.
    https://www.rki.de/DE/Content/Infekt/EpidBull/Merkblaetter/Ratgeber_Pertussis.html (accessed on 8 July 2026)
  3. World Health Organisation (WHO). Pertussis. Updated 2025/2026.
    https://www.who.int/health-topics/pertussis (accessed on 8 July 2026)
  4. European Centre for Disease Prevention and Control (ECDC). Factsheet on Pertussis.
    https://www.ecdc.europa.eu/en/pertussis (accessed on 8 July 2026)
  5. Federal Ministry of Health. Whooping cough (pertussis): causes, progression, treatment.
    https://gesund.bund.de/keuchhusten (accessed on 8 July 2026)
  6. Centres for Disease Control and Prevention (CDC). About Whooping Cough (Pertussis). Updated 2026.
    https://www.cdc.gov/pertussis/ (accessed on 8 July 2026)

The Right Protection: An overview of PPE measures

Choosing the right personal protective equipment (PPE) is essential to protect patients and staff from infection. The following table provides an overview of the required types of PPE, categorised by route of transmission and associated infection risk.
PPE for basic hygiene

Use PPE in a targeted and situational manner. Depending on the risk of contamination, gloves, protective gowns, face masks or safety goggles may be required, regardless of the pathogen.

Examples: Contact with blood, secretions/excretions, extensive wound care

PPE for contact protection measures or contact isolation

Use disposable med. gloves and protective gowns. Depending on the pathogen and clinical picture, protective goggles and a face mask may also be required.

Examples: MRSA, Clostridioides difficile

PPE for droplet isolation

Use disposable med. gloves, protective gowns and face mask. Depending on the pathogen and clinical picture, protective goggles may also be required.

Example: Whooping cough

PPE for aerogenic isolation

Use disposable med. gloves, protective gown, respirator (e. g. FFP-2). Depending on the pathogen and clinical picture, protective goggles may be required.

Examples: Overt tuberculosis of the respiratory tract, measles

PPE for special isolation station

Generally use of blower protection suits.

Examples: Ebola, Marburg virus

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