At present influenza immunity can only be reliably confirmed by a blood test. This test is invasive for the patient. This study is intended to validate an oral fluid/saliva antibody test for the variant Swine Influenza H1N1. If such a test were available, this painless and non invasive test will improve direct clinical care to an individual as well as significantly help guide future public health management of the pandemic.

Inclusion Criteria:

• Participants of the clinical service evaluation of novel H1N1v vaccine
• First or second blood sample for the clinical service evaluation successfully collected

Exclusion Criteria:

• Withdrawn from clinical service evaluation of novel H1N1v vaccine
• Second blood sample for the clinical service evaluation not collected.

Subjects from primary care who are participating in the clinical service evaluation.