Fig 4. Levels of IgA in the faeces following oral and IV vaccination.
Anti-Salmonella LPS IgA antibody levels secreted in the faeces of mice vaccinated either orally (black) or intravenously (grey) from day 0 to day 91 post vaccination (n = 7–8 per group). Data are expressed as log10 reciprocal titres. Dashed grey and black lines represent the means for the IV and oral groups respectively. Boxplots display medians, IQRs and the complete spread of data. Dotted line represents the minimum detection limit for the assay (reciprocal titre of 5). Faecal IgA was detected in all orally vaccinated mice by 21 days post vaccination, faecal IgA was never detected in IV vaccinated mice.