Which COVID-19 vaccination is administered in 2 doses 28 days apart?

The correct response is based on the specific dosing schedule associated with the Moderna COVID-19 vaccine. The Moderna vaccine is designed to be administered in two doses, with the second dose given 28 days after the first. This 28-day interval is crucial for maximizing the immune response and ensuring effective protection against COVID-19.

Other vaccines mentioned have different dosing schedules. For instance, the Pfizer-BioNTech vaccine is typically administered in two doses as well, but the time interval between doses is 21 days, not 28. The Janssen vaccine is different altogether, as it is a single-dose vaccine, requiring just one administration. Thus, the two-dose, 28-day regimen is uniquely attributable to the Moderna vaccine, making it the correct answer in the context of the question.