Table 3. Associations between MBL2 haplotypes and invasive bacterial co-infection in fatal influenza in children and young adults, United States, 1998–99 through 2007–08 influenza seasons*.

Outcome	Estimated odds ratio (95% CI)
	Low producing MBL2 haplotype†	Intermediate or high producing MBL2 haplotype‡	p value
MRSA, n = 8	7.1 (1.6–32.1)	Referent	0.02
Staphylococcus aureus, n = 13	3.0 (0.8–11.2)	Referent	0.11
Bacterial co-infection, n = 22	2.7 (0.9–8.6)	Referent	0.10

*MBL2, mannose-binding lectin gene; MRSA, methicillin-resistant Staphylococcus aureus.
†includes MBL2 haplotypes O/O and XA/O.
‡includes MBL2 intermediate producer haplotypes XA/XA and YA/O and high producer haplotypes XA/YA and YA/YA.