Biology of Immunization and Vaccination for Covid-19.
Vaccination is not a guarantee for preventing immediate infection and re-infection post vaccination. The body takes time to build immunity post vaccination.
That is why one can't be protected within days of vaccination from Covid-19 infections.
Nigeria is targeting 60-70 million to be vaccinated. The storage facilities are not available. That's why the WHO has not certified Nigeria to be eligible to receive the vaccines. We could get less than 1 million vaccines for low temperature cold storage facilities.
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