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Combination injections are better than separate ones for these cases
IF is produced by parietal cells of the stomach and is essential for the transportation and absorption of vitamin B12 in the terminal portion of the ileum 2
For patients with severe kidney disease, impaired renal function can affect how excess B12 is cleared from the body
Mucosal immunity Currently licensed SARS-CoV-2 vaccines are all delivered parenterally via intramuscular injection, which leads to some limitations for vaccine roll-out and potentially for protective efficacy (Table 1)
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