Histoplasmosis

What is histoplasmosis?

From: MedlinePlus, National Library of Medicine

Histoplasmosis is an infection caused by a fungus called Histoplasma. This fungus is common in the central and eastern United States, especially around the Ohio and Mississippi River valleys. It can also be found in parts of Central and South America, Africa, Asia, and Australia. It lives in the environment, especially in soil that contains large amounts of bat or bird droppings (poop).

How do you get histoplasmosis?

From: MedlinePlus, National Library of Medicine

You get histoplasmosis by breathing in Histoplasma fungal spores from the air. It usually happens after you have been doing an activity that disturbs the soil, such as farming, construction, and landscaping. Histoplasmosis is not contagious. This means that you cannot get the infection from another person or an animal.

What are the symptoms of histoplasmosis?

From: MedlinePlus, National Library of Medicine

Most people who breathe in the spores never have any symptoms. If you do get symptoms, they usually start between 3 and 17 days after you breathe in the spores. The symptoms may include:

For most people, the symptoms of histoplasmosis will go away within a few weeks to a month. However, some people can have symptoms that last longer, especially if their infection becomes severe. Certain people are more likely to get a severe infection:

Severe histoplasmosis can develop into a long-term lung infection. It can also spread from the lungs to other parts of the body, such as the central nervous system (the brain and spinal cord). This is known as disseminated histoplasmosis.

• Fever
• Cough
• Fatigue
• Chills
• Headache
• Chest pain
• Body aches
• People who have weakened immune systems, for example from: Having HIV Having had an organ transplant Taking medicines which weaken your immune system, such as chemotherapy and steroids
• Infants
• Adults age 55 and over

How is histoplasmosis diagnosed?

From: MedlinePlus, National Library of Medicine

To find out if you have histoplasmosis, your health care provider:

• Will ask about your symptoms and your medical and travel history
• Will do a physical exam
• Will likely order a blood, urine, or tissue test to look for signs of the fungus
• May order a chest x-ray or CT scan of the lungs

What are the treatments for histoplasmosis?

From: MedlinePlus, National Library of Medicine

For some people, the symptoms of histoplasmosis will go away without treatment. But you will need treatment if you have severe histoplasmosis in the lungs, chronic histoplasmosis, or an infection that has spread to other parts of the body. That treatment would be with prescription antifungal medicines. In some cases, you may need to take the medicines for 3 months to 1 year.

Understanding terms used in the source

These definitions explain medical words used above. A definition is not evidence that another condition is present, and it does not predict how a symptom will develop. Ask the clinician which terms apply to the actual examination or test result.

Severe infection

A type of infection that is regarded as a sign of a pathological susceptibility to infection because of unusual severity or intensity of the infection.

Chest pain

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

Headache

Cephalgia, or pain sensed in various parts of the head, not confined to the area of distribution of any nerve.

Central

Applies to an abnormality that is located close to the median plane or midline of the body or of the referenced structure.

Fatigue

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

Which doctor should you see?

The suggested department for discussing Histoplasmosis 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

Where the source describes treatments, these are an overview of possible care, not a prescription for an individual. Ask which option applies to the confirmed diagnosis, what benefit is expected, what adverse effects to watch for and how progress will be assessed. Availability, approvals and local practice can differ from the country described in the source.

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.