Nocardiosis

What it is

From: Orphanet

A rare bacterial infection characterized by various clinical manifestations depending on the site of infection, caused by the Gram-positive bacillus Nocardia. The most common presentation is lung infection, which typically follows pathogen inhalation. Dissemination to other organs may occur, especially among immunocompromised patients. Primary skin and soft-tissue infection follows skin inoculation.

Reported clinical features and what the terms mean

The following findings are associated with this condition in Orphanet. They are not a checklist for diagnosing yourself, and they do not all occur in every affected person. Some are examination, imaging or laboratory findings that cannot be recognised at home.

The frequency labels describe how often a finding was reported among people with the condition in the source. They do not give the chance that a person with that symptom has the condition. Definitions below reproduce HPO terminology; they explain the term, not the likely severity in an individual.

Fever · Very frequent (99-80%)

Body temperature elevated above the normal range.

Abnormal sputum · Frequent (79-30%)

Abnormal appearance of material expectorated (coughed up) from the respiratory system and that is composed of mucus but may contain other substances such as pus, blood, microorganisms, and fibrin.

Bacteremia · Frequent (79-30%)

Presence of viable bacteria in the blood.

Chest pain · Frequent (79-30%)

An unpleasant sensation characterized by physical discomfort (such as pricking, throbbing, or aching) localized to the chest.

Dyspnea · Frequent (79-30%)

Difficult or labored breathing. Dyspnea is a subjective feeling only the patient can rate, e.g., on a Borg scale.

Fatigue · Frequent (79-30%)

A subjective feeling of tiredness characterized by a lack of energy and motivation.

Immunodeficiency · Frequent (79-30%)

Failure of the immune system to protect the body adequately from infection, due to the absence or insufficiency of some component process or substance.

Pneumonia · Frequent (79-30%)

Inflammation of any part of the lung parenchyma.

Productive cough · Frequent (79-30%)

A cough that produces phlegm or mucus.

Anorexia · Occasional (29-5%)

Lack of desire to eat (loss of appetite).

Brain abscess · Occasional (29-5%)

A collection of pus, immune cells, and other material in the brain.

Chills · Occasional (29-5%)

A sudden sensation of feeling cold.

Conjunctivitis · Occasional (29-5%)

Inflammation of the conjunctiva.

Cutaneous abscess · Occasional (29-5%)

A circumscribed area of pus or necrotic debris in the skin (within the epidermis or dermis).

Other findings in the same source

From: Orphanet

Additional reported features include Dacryocystitis (Occasional (29-5%)); Headache (Occasional (29-5%)); Hemoptysis (Occasional (29-5%)); Liver abscess (Occasional (29-5%)); Lymphadenitis (Occasional (29-5%)); Night sweats (Occasional (29-5%)); Nonproductive cough (Occasional (29-5%)); Ocular pain (Occasional (29-5%)); Osteomyelitis (Occasional (29-5%)); Pericarditis (Occasional (29-5%)). This is a selected summary, not a complete description of the condition.

When it may begin

From: Orphanet

All ages

Inheritance in the source

From: Orphanet

Not applicable

Frequency and the population described

From: Orphanet

Annual incidence: 1-9 / 1 000 000; Canada; Value and class.

Which doctor should you see?

The suggested department for discussing Nocardiosis is Infectious Diseases, with a general physician / infectious disease specialist as the relevant type of clinician. General physician / Family Medicine; paediatrician for children. Referral depends on symptoms.

This is an editorial referral starting point. The appropriate clinic depends on the person’s age, symptoms, previous diagnosis and local services. The first clinician can decide whether another specialty or a team is needed; a department label does not confirm the diagnosis.

How to prepare for an assessment

Bring a short timeline of the main symptoms: when they first appeared, whether they are constant or episodic, what seems to change them, and how they affect daily activities. Include previous reports, discharge summaries, current medicines and supplements, allergies, and any relevant family history. A dated record is more useful than trying to match every feature in an online article.

Ask the clinician what is already established and what remains uncertain. If a test is suggested, ask what question it answers, what its limitations are and how the result would change the next step. The information here is not an instruction to arrange every possible test. In children, bring growth, developmental and school information if it is relevant to the concern.

• Which exposure or organism is suspected, and what evidence would confirm it?
• Are precautions, vaccination or advice for close contacts relevant to this infection?
• What should happen if symptoms worsen or do not improve as expected?

Treatment discussions and follow-up

The material gathered for this draft does not provide a complete condition-specific treatment pathway for Nocardiosis. That gap does not mean that treatment is unavailable. A clinician needs to establish the diagnosis and review current guidance before recommending medicines, procedures, rehabilitation or other support.

Before leaving the appointment, clarify the next review date, who will communicate results, and whom to contact if the situation changes. Discuss difficulties with sleep, work, school, mobility, eating or emotional wellbeing when these are relevant. Practical support may require coordination between the treating clinician and other services.

The collected references do not establish a complete prevention or long-term outlook section for this entry. Missing information should not be interpreted as proof that prevention is impossible or that a particular outcome is inevitable. Ask what is known for the exact subtype, stage and personal circumstances, and which uncertainties remain.

When to seek emergency help

Severe breathing difficulty, collapse, new stroke-like symptoms, a seizure that is prolonged or repeated without recovery, uncontrolled major bleeding, or an immediate risk of self-harm require emergency help. In India, call 112 or reach the nearest emergency department. This is a general, non-exhaustive warning list; it is not a condition-specific triage tool.