Mannose Binding Lectin Deficiency
This is a common immunodeficiency that most individuals, about 3% of the population, who have it do not know and live normal lives. It is defined as low levels of an immune protein called mannose-binding lectin. Individuals with this diagnosis are susceptible to recurrent sinopulmonary infections including sinusitis, bronchitis and pneumonia.
Early Complement Deficiencies (C1, C2, C3 & C4)
Patients with a deficiency of one of the early complement components are susceptible to infections with encapsulated bacterial infections such as Streptococcus Pneumoniae and Haemophiles Influenza type b.
Late Complement Deficiencies (C5, C6, C7, C8, C9)
Patients with a deficiency of one of the late complement components are susceptible to recurrent Neisseria Meningitidis or Neisseria Gonorrhoeae infections, which cause Meningitis and Gonorrhea respectively.