CD4 and influenza: Antibodies to 5 of the 6 Mtb antigens assessed followed the same pattern as anti-ESAT-6/CFP-10-specific IgGs while the non-Mtb-related IgG control (the hemagglutinin protein of influenza) did not vary between HIV or CD4 groups, suggesting that the finding of higher Mtb-specific antibodies was pathogen-specific.