What is a contagious liver disease that is spread primarily through contact with the blood of an infected person but can also be spread through bodily fluids during sexual contact?

Hepatitis can be spread through a blood transfusion or bodily fluids.

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.