The vaccine contains harmless genetic code copied from the virus that causes the disease. Antibody-dependent activation has been suggested as a potential challenge in SARS-CoV-2 vaccine development, but is controversial.
Chanjo hiyo ina msimbo wa jenitiki usio na madhara uliyonakiliwa kutoka kwa ugonjwa huo. Uboreshaji unaotegemea kingamwili umependekezwa kama changamoto inayowezekana ya maendeleo ya chanjo ya SARS-COV-2, lakini ina utata.