Table 1. Composition of the cohort in terms of male (M) and female participants (F), and post-hoc defined groups of participants that remain seronegative (IgG-) or become seropositive (IgG+) over the course of 6 months.

Factors and interaction		n
Susceptibility	IgG-	42
	IgG+	58
Sex	F	65
	M	35
Susceptibility × Sex	F-	29
	F+	36
	M-	13
	M+	22