21 October, 2008

Polio vaccine

Photo: oral polio vaccine, one vial contain 20 doses.

Polio vaccine

Oral polio vaccine(type I, II, III) is used in Japan.  The time for 
vaccination is Spring and Autumn.  
Polio virus infection;
     Incubation period:   7-21 days
     Transmission:   fecal-oral or oral-oral routes.
               i) low-grade fever and sore throat occurs in 4-8% 
                   of infections.
               ii) most infections in human are asymptomatic.
                   Limb paralysis occurs in approximately 
                  1 /1,000~2,000 infections