Immune Response to Vaccines in Primary Immune Disorders

A recent question about vaccines led me to this clinical trial-

http://clinicalstudies.info.nih.gov/detail/A_2001-I-0226.html

Looks like it opened in 2001 and is still recruiting? Gee, wonder why?

They said, “This study will evaluate immune function in people with a known or suspected immune disorder. It will determine participants’ immune response to vaccines by measuring blood antibody levels after vaccination.”

Now, I have two questions:

1. Are they crazy?

2. How can we get the results?