. 2016 May 30;18(7):e34135. doi: 10.5812/ircmj.34135

Table 2. Anti-OPS IgM Titers in the Sera of the Four Groups of Mice 2 Weeks After the First, Second, and Third Vaccinations^a.

Group	Titer of Sera (OD Unit) (Mean ± SD)
	2 Weeks After the First Vaccination	2 Weeks After the Second Vaccination	2 Weeks After the Third Vaccination
OPS-vaccinated	83^*	150^*	172^*
OPS-DT-vaccinated	97^**	270^**	826^**
DT-vaccinated (control I)	0	0	0
Neg. control (control II)	0	0	0

^a* and ** denotes a significant difference in comparison to the control groups (P < 0.001).

Table 2. Anti-OPS IgM Titers in the Sera of the Four Groups of Mice 2 Weeks After the First, Second, and Third Vaccinationsa.