14th February 2024

A 41-year-old female had recurrent chest, ear and sinus infections since childhood

A 41-year-old female had recurrent chest, ear and sinus infections since childhood but has never sought any investigations or treatment. Initial blood work reveals a negative HIV test. A blood culture reveals the presence of Streptococcus pneumoniae. Due to the recurrent infections, she is referred for investigation for immunodeficiency.

She is most likely to have a deficiency in which of the following?

Select the SINGLE most appropriate option from the list below. Select ONE option only.