I hope things have changed since 1967. There was the start of hepatitis in our unit in Vietnam. To stop the spread, everyone was dosed with Gamma Globulin. The dose was 1cc for every 20 pounds body weight. Since I weighed 160#, that was a syringe with with 4cc of 'flour and water paste' high in each butt cheek.

I looked like I had golf balls under the skin and they lasted for three days. The pain lasted for a week.