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PubMed This is a summary of 21 peer-reviewed journal articles Updated
Clinical Immunology · Mendelian Susceptibility to Mycobacterial Diseases Due to Complete RORγ Deficiency

Recognizing Symptoms and Knowing When to Seek Help

At a Glance

Children with complete RORC deficiency are prone to persistent Candida infections and serious mycobacterial or BCG reactions. A draining BCG site, swollen nodes, fever, poor growth, or bone pain needs prompt specialist advice; breathing trouble or altered alertness is an emergency.

Living with complete RORC deficiency means your child’s immune system has two specific vulnerabilities. Because of these gaps, symptoms usually fall into two very different categories: persistent yeast infections (Candida) and more serious reactions to certain bacteria (Mycobacteria). Recognizing these signs early is key to getting the right treatment before a small issue becomes a serious one [1][2].

1. Chronic Mucocutaneous Candidiasis (CMC)

The first sign of RORC deficiency is often Candida, a type of yeast. In most children, yeast infections are temporary and easily cured. In children with this condition, the infection is often chronic (long-lasting) or recurrent (keeps coming back) [3].

  • Persistent Oral Thrush: Creamy white patches on the tongue, inner cheeks, or roof of the mouth that may bleed if wiped. Unlike typical thrush, this may not clear up with standard over-the-counter gels [1].
  • Severe Diaper Rash: A bright red, “beefy” rash in the diaper area, often with small “satellite” spots around the edges. It may look raw or painful and persist despite frequent diaper changes and standard barrier creams [3].
  • Skin and Nail Infections: You may notice redness, swelling, or crusting around the fingernails or toenails, or itchy, scaly red patches in the folds of the skin (like the elbows or behind the knees) [1].

2. Mycobacterial Infections and BCG Reactions

The second major vulnerability involves mycobacteria. For many children, the first sign of trouble is a severe reaction to the BCG vaccine [4].

  • BCG-Site Inflammation: It is normal for a BCG site to form a small scar. However, in RORC deficiency, the site may become very large, stay red and angry for months, or turn into an open, draining sore (an abscess or fistula) [5][6].
  • Swollen Lymph Nodes (Lymphadenopathy): You may feel firm, pea-sized or larger lumps under the skin, most often in the armpit near the vaccine site, or in the neck and groin [7]. These nodes may become soft, red, and eventually drain fluid [6].
  • Systemic Symptoms: Unlike a simple skin infection, mycobacterial disease can affect the whole body, leading to persistent “low-grade” fevers, night sweats, or a general lack of energy [7][8].

Triage: Creating an Emergency Action Plan

Because mycobacterial infections can spread (disseminate) through the blood to the bones, lungs, and organs, they can become life-threatening if not treated aggressively [9][10]. You must have a pre-agreed Emergency Action Plan with your immunologist. Do NOT start, stop, or change antimicrobials without explicit instructions from your treating team.

Seek Immediate Emergency Medical Care (Call 911 or Go to the ER) If:

  • Respiratory Distress: Your child is breathing very fast, their skin is pulling in between their ribs or at the neck (retractions), or their lips/fingernails look blue or gray [11][10].
  • Altered Mental State: Your child is unusually sleepy, difficult to wake up, confused, or not responding to you normally [12].
  • Signs of Shock: Your child feels very cold or clammy, looks pale/ashen, or has a very fast heart rate [10].
  • New Neurological Signs: A sudden seizure, a very stiff neck, or a bulging “soft spot” (fontanelle) on an infant’s head [12][13].

Call Your Specialist Immediately (Day or Night) If:

  • Fever Over Your Child’s Specific Threshold: Ask your doctor exactly what temperature warrants an immediate call. Any fever in a young or clinically unwell child with this condition requires urgent assessment; disseminated disease does not always present with a high fever [14][8].
  • New Draining Lesions: A BCG site or lymph node suddenly opens or starts draining fluid [6].
  • Rapidly Enlarging Nodes or Organ Swelling: You notice a lymph node growing quickly, or your child’s belly looks unusually full or firm (which could mean an enlarged liver or spleen) [15][16].
  • Bone or Joint Pain: Your child starts limping, refuses to walk, or cries when a specific limb is moved [17][18].
  • Rapid Weight Loss: Your child is losing weight or failing to grow as expected (failure to thrive) [19].
  • Jaundice or Severe Vomiting: A yellow tint to the skin/eyes, or inability to keep fluids down (which can also be a sign of medication toxicity) [20].

Advocacy Tip: Always tell the triage nurse or ER doctor immediately that your child has RORC deficiency (an inborn error of immunity) and is at high risk for disseminated mycobacterial/BCG infection. Carry a one-page emergency letter from your immunologist detailing the condition, current medications, and the on-call doctor’s contact information [11][21].

Common questions in this guide

What early symptoms can complete RORC deficiency cause in a child?
The condition often causes Candida infections that are persistent or keep returning, such as oral thrush, severe diaper rash, or infections of the skin and nails. It can also cause an unusually severe BCG-site reaction, swollen lymph nodes, fever, night sweats, or low energy.
How can I tell whether a BCG vaccine reaction is concerning?
A small BCG scar is expected, but prolonged redness, a large inflamed area, an open sore, drainage, or swollen lymph nodes near the site is not typical. In a child with complete RORC deficiency, contact the immunology team immediately about these changes.
Which symptoms mean my child needs emergency care?
Call emergency services or go to the emergency department for fast or difficult breathing, ribs or neck pulling in, blue or gray lips or nails, unusual difficulty waking, confusion, signs of shock, a seizure, a stiff neck, or a bulging soft spot in an infant. These signs can indicate a life-threatening complication and should not wait for a routine appointment.
What fever should prompt a call to the immunologist?
Ask your child’s immunologist for a specific temperature threshold and keep it in the emergency plan. Any fever in a young or clinically unwell child with complete RORC deficiency needs urgent assessment, because serious mycobacterial infection may occur without a high fever.
What other changes should I report urgently?
Call the specialist promptly for a new draining BCG or lymph-node lesion, rapidly enlarging nodes, a swollen or firm belly, bone or joint pain, limping, weight loss, poor growth, jaundice, or severe vomiting. Do not start, stop, or change antifungal or antimycobacterial medicines unless the treating team tells you to.
What should we bring to the hospital in an emergency?
Tell triage staff immediately that your child has complete RORC deficiency, an inborn error of immunity, and a high risk of disseminated mycobacterial or BCG infection. Carry an emergency letter or card listing the diagnosis, current medicines, the child’s fever threshold, and the immunology team’s contact information.

Get notified when new evidence is published on Mendelian susceptibility to mycobacterial diseases due to complete RORgamma receptor deficiency.

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References

References (21)
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This page is for caregivers of children with complete RORC deficiency and is for informational purposes only; it does not replace medical advice. Follow your child’s immunology emergency plan and contact the treating team for urgent concerns.

Guide contents Mendelian susceptibility to mycobacterial diseases due to complete RORgamma receptor deficiency
Research & Literature
01 Understanding Your Child's Diagnosis 03 The Science of RORC