When I was sent to Puerto Rico I needed a Yellow Fever vaccination. The dispensary in Philly didn't have it so they noted in my records that I didn't have it and would get it in Puerto Rico. It never happened. When I was getting discharged back it Philly and they saw I did not receive it they gave it to me in Philly the day before I was discharged. It was effective, it has protected me against Yellow Fever in PA and now here ever since