In this study The antibodies of the currently infected COVID-19 patients are changed, therefore, it is the (1) variable. Length of stay in the intensive care units of COVID-19 patient is expected to change, then, it is the (2) variable. Ages of currently COVID-19 patients and antibodies of COVID-19 survivors are the same all throughout the investigation, then these two are said to be the (3) variables.
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Answer:
In the face of this unprecedented pandemic, Gavi is working with countries to support COVID-19 response and to maintain and restore routine immunisation. The Alliance is also co-leading global efforts on equitable access to COVID-19 vaccines.
Explanation:
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