Match each type of vaccine with the corresponding example.
â  vaccine
a. weakened influenza virions that can only replicate in the slightly lower temperatures of the nasal passages are sprayed into the nose. they do not cause serious flu symptoms, but still produce an active infection that induces a protective adaptive immune response.
â  attenuatedâ  vaccine
b. tetanus toxin molecules are harvested and chemically treated to render them harmless. they are then injected into a patient’s arm.
â  vaccine
c. influenza virus particles grown in chicken eggs are harvested and chemically treated to render them noninfectious. these immunogenic particles are then purified and packaged and administered as an injection.
â  vaccine
d. the gene for hepatitis b virus surface antigen is inserted into a yeast genome. the modified yeast is grown and the virus protein is produced, harvested, purified, and used in a vaccine.