Covid Exposure Risk Calculator

• You take low-dose steroids (for example, < 20 mg of prednisone per day) for a chronic condition (e.g. asthma, mild rheumatoid arthritis)
• You take a single immune-modulating medicine such as methotrexate or azathioprine
• You have HIV with a CD4 count currently between 200–500 cells/μL (you can check your last blood test)
• You have a solid-organ transplant (kidney, liver, heart, etc.) and it's been more than one year since your transplant; you take two anti-rejection drugs but feel stable
• You have a moderate primary immune defect (e.g. common variable immunodeficiency on intermittent immunoglobulin infusions)

• You take B-cell–depleting therapy such as rituximab, ocrelizumab, or CAR-T therapy
• You're within one year of a solid-organ transplant or bone-marrow/HSCT (stem-cell transplant)
• You're actively receiving chemotherapy or high-dose radiation for cancer
• You have HIV with a CD4 count below 200 cells/μL (or you have AIDS-defining conditions)
• You have a primary combined immunodeficiency (for example, severe congenital immunodeficiency)

Estimate the approximate percentage of people who were wearing masks. This helps calculate how many infectious particles were released into the air.

Even if some people were masked, you'll be asked about what type of masks they wore in the next question.