“Can vaccinating someone twice provide added immunity?
In adults, studies have not shown a benefit from getting more than one dose of vaccine during the same influenza season, even among elderly persons with weakened immune systems. Except for children getting vaccinated for the first time, only one dose of flu vaccine is recommended each season.”
Since they say that “studies have not shown” rather than “we don’t have studies that show,” I’m more inclined to believe them.
I may have found the answer to my lazy question on the CDC website:
https://www.cdc.gov/flu/prevent/misconceptions.htm
“Can vaccinating someone twice provide added immunity?
In adults, studies have not shown a benefit from getting more than one dose of vaccine during the same influenza season, even among elderly persons with weakened immune systems. Except for children getting vaccinated for the first time, only one dose of flu vaccine is recommended each season.”
Since they say that “studies have not shown” rather than “we don’t have studies that show,” I’m more inclined to believe them.