The 10 warning signs for paediatric primary immune deficiency15
| ≥4 new ear infections within 1 year | Recurrent deep skin or organ abscesses |
| ≥2 serious sinus infections within 1 year | Persistent thrush in mouth or fungal infection of skin |
| ≥2 months of oral antibiotic treatment with little effect (possibly) | Need for IV antibiotics to clear infections (possibly) |
| ≥2 episodes of pneumonia within 1 year (depending on organism) | ≥2 deep-seated infections, including septicaemia |
| Failure of an infant to gain weight or grow normally | A family history of PID |
PIDs, primary immune deficiencies.