The study will investigate how the dose of AZD8848 and the dosing frequency will affect the immunological/inflammatory response by measuring the production of biomarkers in blood and nasal lavage.

Inclusion Criteria:

• Healthy men or women aged 18 to 55 years (inclusive). Women must be of non-childbearing potential or must have been stable on a highly effective contraceptive method for at least 3 months prior to Visit 1 and be willing to continue on the chosen contraceptive method, with additional use of a condom by male partners, until 3 months after last dose.
• Female subjects should have a negative pregnancy test at Visit 2 and date of last menstruation consistent of non-pregnancy
• Ability to metabolise AZD8848 (an in vitro screening assay will determine metabolic activity in a blood sample taken at Visit 1 using a pre-defined limit)

Exclusion Criteria:

• Any clinically significant disease or disorder
• Any clinically relevant abnormal findings in physical examination
• Structural abnormalities of the nose or nasal disorder symptomatic enough to cause significant nasal obstruction
• Ongoing pregnancy or lactation
• Abnormal immune function