Initially, failure to thrive, and increased susceptibility to infections are indicators of SCID. When normal infant infections (ear infections, sinus infections, oral thrush, diarrhea) last unusually long, it is a sign of weakened immune system. Extreme symptoms within the first year of life include: - eight or more ear infections - two or more sinus infections/ cases of pneumonia/ deep infections which affect entire organs or require IV antibiotics - lack of response to antibiotics Doctor will diagnose a child with SCID when he shows: - abnormally low lymphocyte count - abnormally low T- and B- call count - unusual infection for a prolongd period of time
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