what are the advantages of producing vaccines by biotechnology?

Explanation

i. Vaccines produced by biotechnology are comparatively safer than using completely or partially killed pathogens as vacc ines.
ii. These vaccines are more thermo-stable.
iii. Vaccines produced by biotechnology remain active for longer periods in the body.
iv. Edible vaccines are being produced using biotechnology. e.g. Transgenic potatoes provide immunity against cholera and diseases caused by Escherichia coli.