Influence of Military Preventive Policy for reCruit Training on COVID-19 Seroconversion

Exclusion Criteria

• •Previously diagnosed with COVID-19 either by RT-PCR or serologically (either prior to the study or at initial baseline testing).
• •Use of over-the-counter or prescribed vitamin D supplements currently or in the past month
• •Condition conferring 'very high risk' or 'high risk' of severe COVID-19
• •* have had an organ transplant
• •* are having chemotherapy or antibody treatment for cancer, including immunotherapy
• •* are having an intense course of radiotherapy (radical radiotherapy) for lung cancer
• •* are having targeted cancer treatments that can affect the immune system (such as protein kinase inhibitors or PARP inhibitors)
• •* have blood or bone marrow cancer (such as leukaemia, lymphoma or myeloma)
• •* have had a bone marrow or stem cell transplant in the past 6 months, or are still taking immunosuppressant medicine
• •* are pregnant or intent on becoming pregnant during the anticipated study period
• •* have a learning disability
• •* have a lung condition (such as cystic fibrosis, asthma, COPD, emphysema or bronchitis)
• •* have heart disease (such as heart failure)
• •* have high blood pressure (hypertension)
• •* have diabetes
• •* have chronic kidney disease
• •* have liver disease (such as hepatitis)
• •* have a condition affecting the brain or nerves (such as Parkinson's disease, motor neurone disease, multiple sclerosis, or cerebral palsy)
• •* have a problem with the spleen or have had the spleen removed
• •* have a condition with high risk of getting infections (such as SCID, sickle cell, HIV, lupus or scleroderma)
• •* are taking medicine that can affect the immune system (such as steroids)
• •* are very obese (a BMI of 40 or above)