nonresponder

noun2

1. •
   A person who does not respond.

   • The court sent "requests to show cause" to all questionnaire non-responders.
2. •
   A person who does not show an immune response to a virus after being vaccinated against it; someone who does not react normally to a drug.

   • A vaccine non-responder is a person who does not develop protective surface antibodies after completing two full series of injections.