Medical Genetics Common symptoms include diarrhea, malabsorption and failure to thrive. The diarrhea usually is noninfectious but may be associated with giardia lamblia, rotavirus cytomegalovirus, or Cryptosporidium In some patients the diarrhea may be exudative with loss of serum proteins and lymphocytesMedical Genetics Common symptoms include diarrhea, malabsorption, and failure to thrive. The diarrhea usually is noninfectious but may be associated with Giardia lamblia, rotavirus, cytomegalovirus, or Cryptosporidium. In some patients, the diarrhea may be exudative with loss of serum proteins and lymphocytes