The COVID-19 pandemic caused by SARS-CoV-2 virus has been affecting the whole world for more than a year and its prevalence is increasing.
Vaccines against SARS-CoV-2 are the most promising means to control the spreading of the disease and more than 200 vaccines are under development.
As of February 2021, at least 7 different vaccines across three platforms have been rolled out worldwide.
However, the stability, safety issues and the long-term protection effects of those vaccines remain unclear.
Through vaccination, the patients' immune system is activated, and the memory B or T cells recognize the foreign virus.
Upon infection, the body is able to produce more antibodies rapidly, hence offering protection against the virus.
Oral vaccines are safe and convenient for all ages of citizens.
As the oral administration requires no needle, the vaccine can be delivered to patients much quickly without adding burden to the alreadystretched healthcare system.
The storage and shipping of oral vaccines are more versatile and require no cold-chain logistics.
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