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              Open Access  
Copyright: The authors. This article is an open access 
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              Research (Published 
online :  23-09-2013) 
3. Preparation of Foot and Mouth Disease trivalent 
vaccine type A, O, SAT2 with determination of the Guinea pig protective dose 50 
(GPPD50) - Hind M. Daoud, Ehab El-Sayed Ibrahim, Wael Mossad Gamal 
El-Din and Amr Ismail Hassan Hassanin  
Veterinary World, 6(11): 844-851 
                
              doi: 
              10.14202/vetworld.2013.844-851 
                
              
              
          
 
              Abstract 
 
              Aim: To determine the minimal 
              effective dose of Foot and Mouth disease (FMD) serotypes (A, O, 
              SAT2) according to antigenic content (146S) in order to produce a 
              potent trivalent FMD vaccine. Materials and Methods: Monovalent ISA 206 vaccines were 
              prepared with 3 final concentration of 146S (1.6, 2.2, 2.8 
              µg/dose). The vaccine potency was evaluated by the determination 
              of guinea pig protective dose 50 (GPPD50)for each concentration of 
              146S for each type of FMD monovalent vaccine where a fourfold 
              dilution of the vaccines was constructed and each dilution was 
              inoculated as 0.5 ml S/C in each of 5 guinea pigs.
 Results: The obtained results revealed that by using 1.6 µg 
              of 146S for type O Pan Asia-2, A Iran O5 and SAT/EGY/2012, the 
              GPPD50 was 40.4, 19.75 and 31.6 respectively, while the use of 2.2 
              µg of 146S resulted in GPPD50 78.6, 78.6 and 105.8 for the three 
              types respectively, and by using 2.8 µg of 146S resulted in GPPD50 
              161.7, 105.8 and 161.7 for the three subtypes (A, O, SAT2) 
              respectively. So it is clear that the lowest 146S dilution 
              inducing good protection (more than 72 GPPD50) was 2.2 µg for each 
              serotype of used FMD monovalent vaccines. Depending on this 
              result, the trivalent vaccine was formulated as 2.2 µg of 146S 
              payload from each virus type/dose with equal volume of montanide 
              ISA 206 oil as adjuvant. For more confirmation the prepared 
              trivalent vaccine potency was evaluated by Guinea pig protective 
              dose 50 which was found to be 88 GPPD50.Also mean SNT antibody 
              titer was detected in serum of the test Guinea pigs 1.56, 1.68 and 
              1.68 log10/ml against FMDV serotype O Pan Asia-2, A Iran O5 and 
              SAT/EGY/2012 respectively in a higher level than the recommended 
              protective titer (PT=1.2). Also for further confirmation the 
              formulated trivalent vaccine which contain 2.2 µg/serotype/dose 
              were evaluated in cattle to measure the antibody titer against the 
              three serotypes and the antibody against the three serotypes were 
              found to be higher than the recommended titer (1.5) which extended 
              for 32 WPV and these results came in parallel manner to the GPPD50 
              and antibody titer of the Guinea pigs of the prepared trivalent 
              vaccine with 146S (2.2 µg/serotype/dose).
 Conclusion: It could be concluded that the minimum content 
              of antigenic 146S of FMDV serotype O pan Asia, A Iran O5 and SAT2 
              / EGY/2012 should not be less than 2.2 µg/dose/ from each serotype 
              in the trivalent vaccine aiming to induce the permissible 
              protection in vaccinated livestock.
 Keywords: 146S, cattle, FMD, GPPD50, guinea pigs, trivalent 
              vaccine
 
 
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