"Those are the things I would not want to do with my weakened immune system."

People with weakened immune systems have a particular risk of complications.

It's possible that having a weakened immune system does, too.

Some people who have a weakened immune system should not get this vaccine.

The infection may last much longer in a person with a weakened immune system.

People with weakened immune systems were not included in the study.

"Not a good thing for someone with a weakened immune system."

I wish you had not done that, with his weakened system.

This can include children, the elderly and people with weakened immune systems.

Even then it seems to affect only those with weakened immune systems.