Table 1.

Demographic, clinical, epidemiological and laboratory data from blood donors classified as OBIs

Variables Identification of donor	Group A (anti-HBc+/anti-HBs+) (n = 216)						Group B (anti-HBc+/anti-HBs−) (n = 75)
	(D1)	(D2)	(D3)	(D4)	(D5)	(D6)	(D7)	(D8)
Municipality	Manacapuru	Fonte Boa	Tefé	Manicoré	Apǔ́	Coari	Humaitá	Fonte Boa
Sex	Ma	M	M	M	M	M	M	M
Age	41	33	51	50	37	42	63	36
First donation	No	No	No	No	No	No	Yes	No
Marital status	Married	Married	Married	Married	Stabled	Married	Stabled	Stabled
Health care worker	No	No	No	No	No	Yes	No	No
Received blood transfusion	No	No	No	No	No	No	No	No
Past hepatitis	No	No	No	No	No	No	No	No
Family history HBV	No	No	No	No	No	No	No	No
Partner had hepatitis	No	No	No	No	No	No	Unknown	No
Mother had hepatitis	No	No	Unknown	No	No	No	No	No
Use injectable drugs	No	No	No	No	No	No	No	Unknown
Past surgery	No	No	No	No	No	No	Yes	No
Hep B vaccine	No	No	Yes	Yes	Yes	Yes	Unknown	Yes
Has a tattoo or piercing	No	No	No	Yes	No	No	No	No
Sharing of manicure/shaving equipment	No	No	No	No	No	No	Yes	No
Did acupuncture	No	No	No	No	No	No	No	No
Number of sexual partners in the last 12 months	2	1	1	1	0	1	3	0
Use of alcoholic beverages	No	Yes	Yes	No	No	No	Yes	Yes
Anti-HBc positive (S/CO)	0·059b	8·87c	5·480c	6·13c	8·19c	0·080b	4·96c	10·99c
Anti-HBs mIU/ml	>1000	608·79	281·53	284·09	>1000	>1000	33·94	0·05
HBV DNA IU/ml	4·5	3·5	29·0	6751	21·5	6·5	9·6	3·6

^aM, Male.

^bELISA (competitive assay Murex, S/CO values <1 are considered reactive).

^cChemiluminescence.

^dLiving together in a monogamous relationship.