Abstract:<div><table cellspacing="0" cellpadding="0" align="left"><tbody><tr><td align="left" valign="top"><p><em>The incidence of COVID-19 has shown a downward trend in recent months, but transmission is still possible; it is because COVID-19 is still a pandemic, and there may be new variants that can cause an increase in cases. Countermeasures are carried out not only through prevention efforts by health protocols but also through vaccination efforts. Vaccines have proven to … Show more
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