Clinical symptoms vary from no symptoms to highly significant clinical symptoms such as severe respiratory syndrome. 2 , 3 Primary transmitters of SARS‐CoV‐2 would be the patients with no signs and symptoms. 4 Since the beginning of the COVID‐19 outbreak, many strategies and approaches have been proposed to fight against it.
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Recombinant subunits of SARS-CoV-2 spike protein as vaccine candidates to elicit neutralizing antibodies.
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However, a decreasing trend for antibody titer was detected in the test results after 390 days compared to that of the previous days. 3.7.