For example, a two-year longitudinal study of 210 people with symptomatic stool-culture confirmed Campylobacter infection found that among anti-Campylobacter antibodies, IgG were the most variable between individuals (consistent with our findings in Fig 4), and remained at high levels in some individuals throughout the two-year follow-up period; IgM antibodies were generally elevated in the two months following infection and then decreased; and the IgA response declined steeply in the two months after infection and then remained low in most individuals [33]. This evidence concerns the gene CD40LG and infection.