Introduction

Pertussis, commonly known as whooping cough, is a highly contagious respiratory illness caused by the bacterium Bordetella pertussis. While pertussis can affect individuals of any age, certain comorbidities can exacerbate its symptoms, leading to more severe disease, and increased risk of complications. In this article, we will explore the various comorbidities that can worsen pertussis symptoms and discuss their implications.¹

Respiratory comorbidities

Individuals with pre-existing respiratory conditions are particularly vulnerable to severe pertussis symptoms and complications.^1,2 These comorbidities include:

Asthma

Asthma is a chronic inflammatory condition that affects the airways, causing wheezing, shortness of breath, and coughing. Pertussis can trigger asthma exacerbations, leading to increased severity of coughing spells, difficulty breathing, and a higher risk of respiratory failure.^1.2

Chronic obstructive pulmonary disease (COPD)

COPD is a progressive lung disease. It is characterised by airflow obstruction and chronic inflammation. Individuals with COPD have reduced lung function, making it challenging to manage the severe coughing episodes associated with pertussis. This can result in respiratory distress, hypoxia (low oxygen levels), and an increased risk of hospitalisation.^2,3

Other Respiratory Disorders

Conditions such as bronchiectasis, cystic fibrosis, and interstitial lung diseases can also worsen pertussis symptoms. These disorders often involve impaired lung function, making it difficult to clear respiratory secretions, and increasing the risk of complications like pneumonia.^4,5

Immunodeficiency

Individuals with weakened immune systems are more susceptible to severe pertussis infections, and may experience prolonged and severe symptoms.¹ Comorbidities associated with immunodeficiency include:

HIV/AIDS

Individuals with HIV/AIDS have a compromised immune system, making it more challenging for their bodies to fight off infections like pertussis. They may experience more severe coughing episodes, increased risk of complications, and prolonged illness.^1,6

Cancer Treatment

Chemotherapy and radiation therapy can suppress the immune system, leaving individuals more vulnerable to severe pertussis infections. These treatments can also increase the risk of respiratory complications, exacerbating pertussis symptoms.¹

Organ Transplant Recipients

Individuals who have undergone organ transplants often take immunosuppressive medications to prevent rejection. This suppression of the immune system can make it difficult to fight off pertussis, leading to more severe symptoms and an increased risk of complications.^1,7

Malnutrition

Malnutrition, particularly in children and infants, can weaken the immune system and increase the risk of severe pertussis complications. Malnourished individuals may experience:

• Prolonged and severe coughing episodes
• Increased risk of respiratory distress and pneumonia
• Delayed recovery and higher mortality rates

Proper nutrition is crucial for supporting the body's ability to fight off infections and manage pertussis symptoms effectively.⁸

Neurological disorders

Certain neurological disorders can impact respiratory function and make it more challenging to manage pertussis symptoms.^1,9  These comorbidities include:

Cerebral palsy

Individuals with cerebral palsy often have impaired respiratory muscle function, making it difficult to clear respiratory secretions during pertussis coughing episodes. This can increase the risk of complications like pneumonia and respiratory failure.

Epilepsy

Severe coughing episodes associated with pertussis can trigger seizures in individuals with epilepsy, potentially leading to respiratory complications and increased risk of injury.

Other neurological disorders

Conditions such as muscular dystrophy, spinal cord injury, and neuromuscular disorders can impair respiratory function and increase the risk of complications from pertussis.⁹

Pulmonary hypertension 

Pertussis can place significant strain on the cardiovascular system due to severe coughing episodes and respiratory distress. Individuals with congenital defects, such as pulmonary hypertension, can have a severely compromised cardiovascular system.¹⁰

Other conditions

In addition to the comorbidities mentioned above, several other conditions can exacerbate pertussis symptoms, including:

Diabetes

Individuals with diabetes, particularly those with poorly controlled blood sugar levels, are more susceptible to severe infections like pertussis. Uncontrolled diabetes can also impair respiratory function, worsening pertussis symptoms.^1,11

Obesity

Obesity can contribute to respiratory dysfunction, and increase the risk of complications from pertussis. Individuals with obesity may experience more severe coughing episodes and difficulty clearing respiratory secretions.^1,11

Pregnancy

Pertussis can be severe in pregnant people, particularly in the third trimester, due to the physiological changes that occur during pregnancy.  However, there is not a big rate of cases in pregnant people in comparison with non-pregnant people.¹² 

Implications and management strategies

Individuals with comorbidities who contract pertussis are at a higher risk of severe illness, complications, and hospitalisation. Early diagnosis and prompt treatment are crucial in managing pertussis symptoms, and preventing further complications.¹

Treatment typically involves antibiotics to clear the pertussis infection, and supportive care to manage symptoms. Hospitalisation and respiratory support, such as oxygen therapy or mechanical ventilation, may be necessary in severe cases.

It is essential to carefully manage underlying comorbidities while treating pertussis. This may involve optimising respiratory function, controlling blood sugar levels, or adjusting medications to ensure the best possible outcomes.

Prevention through vaccination is also crucial, especially for individuals with comorbidities. The pertussis vaccine (Tdap) is recommended for adults and adolescents to protect against the disease, and reduce the risk of severe illness in those with underlying conditions.¹³

Summary

Pertussis, or whooping cough, is a highly contagious respiratory illness that can be exacerbated by various comorbidities. Respiratory conditions, immunodeficiency, malnutrition, neurological disorders, pulmonary hypertension, and other conditions can worsen pertussis symptoms and increase the risk of complications.

Early diagnosis, prompt treatment, and appropriate management of comorbidities, are crucial for improving outcomes, and preventing severe complications in individuals with pertussis. Prevention through vaccination is also essential, particularly for those with underlying conditions that may predispose them to severe illness.

By understanding the impact of comorbidities on pertussis, and implementing appropriate management strategies, healthcare professionals can improve patient outcomes and reduce the burden of this potentially severe respiratory illness.

FAQs

Can pertussis be prevented in individuals with comorbidities?

Yes, pertussis can be prevented through vaccination. Individuals with comorbidities, especially those with weakened immune systems, or respiratory conditions, should receive the pertussis vaccine (Tdap) as recommended by their healthcare provider. Vaccination helps protect against severe illness and complications.

Are there any special precautions for individuals with comorbidities who contract pertussis?

Yes, individuals with comorbidities who contract pertussis may require additional precautions and monitoring. Close observation for complications, early initiation of appropriate treatment, and careful management of underlying conditions are essential to prevent severe outcomes.

How can pertussis be treated in individuals with comorbidities?

Treatment for pertussis in individuals with comorbidities typically involves antibiotics to clear the infection, and supportive care to manage symptoms and complications. In severe cases, hospitalisation and respiratory support, such as oxygen therapy or mechanical ventilation, may be necessary. Careful management of underlying comorbidities is also crucial to optimize outcomes.

Can pertussis lead to long-term complications in individuals with comorbidities?

Yes, pertussis can potentially lead to long-term complications in individuals with comorbidities, particularly those with respiratory or neurological disorders. These complications may include chronic respiratory issues, neurological deficits, or cardiovascular complications. Close monitoring and proper management are essential to minimize long-term effects.

Should individuals with comorbidities receive any additional vaccines or treatments to protect against pertussis?

In addition to the pertussis vaccine (Tdap), individuals with comorbidities may benefit from other vaccines, such as the influenza vaccine and pneumococcal vaccine, to reduce the risk of respiratory complications. Your healthcare provider can provide specific recommendations based on your individual circumstances and underlying conditions.