Edward jenner is responsible for the smallpox vaccination.

Its True.

The development of smallpox vaccination is all thanks to the remarkable work of Edward Jenner. the Vaccine was invented on July 1, 1796.

Jenner infected an 8 yeard old boy with a pox on may 14, 1976. He keep working at the vaccine until he created a smallpox matter that stopped the development of the disease

Ibelieve this would be an obstacle.

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.