WHIM syndrome-2 (WHIMS2) is an autosomal recessive immunologic disorder characterized by chronic neutropenia and myelokathexis, which is impaired neutrophil mobilization from the bone marrow. Affected individuals have recurrent infections, usually bacterial (summary by Auer et al., 2014). In a review of WHIMS, Heusinkveld et al. (2019) noted that there is significant phenotypic variation among patients, such that some individuals may have an 'incomplete' form of the disorder in which 1 or more of the classic tetrad features are not present. In general, the WHIMS phenotype comprises a spectrum of manifestations with variable expressivity. For a discussion of genetic heterogeneity of WHIMS, see 193670.

Autosomal dominant severe congenital neutropenia-11 (SCN11) is characterized by the onset of recurrent infections, mainly bacterial, in early childhood. Laboratory studies show severe neutropenia due to maturation arrest and impaired development of myeloid cells. Other leukocyte subsets, including B cells and NK cells, may also be subtly affected. Patients should be followed for possible renal dysfunction (Van Nieuwenhove et al., 2020). For discussion of genetic heterogeneity of severe congenital neutropenia, see SCN1 (202700).