In earlier work by Bux et al. (1999) [21] demonstrated infection-specific G-CSF elevation (60–1006 pg/mL) in 20/63 antibody-induced neutropenia patients with active infections (e.g., otitis media, staphylodermia), while non-infected patients maintained normal levels (<39 pg/mL). Here, CSF3 is linked to neutropenia.