Which of the following is an accurate statement concerning the Sabin and Salk vaccines?
The Salk vaccine is more effective in conferring immunity.
The Sabin vaccine is slightly more dangerous because it is made from live, attenuated virus, and the virus occasionally reverts back to its pathogenic form.
The Salk vaccine is cheaper to make than the Sabin vaccine.
The Salk vaccine is easier to administer because it is given orally.