The vaccines for RSV and measles that resulted in ADE were formalin-inactivated vaccines that led to TH2-skewed responses.

Applying lessons learned from ADE-inducing vaccines to SARS-CoV-2 vaccine development 

Santa Clara University

Antibody-dependent enhancement occurs when the antibodies the viruses bind to on the host cell permit increased entry and replication of the virus. This process has been observed in: yellow fever, zika virus, and the novel coronavirus.
ADE affects vaccine development by being a possible unforeseen phenomenon that could cause the vaccine to worsen the patient's condition rather than providing an inflammatory response.

de Alwis, R., Chen, S., Gan, E. S., & Ooi, E. E. (2020). Impact of immune enhancement on Covid-19 polyclonal hyperimmune globulin therapy and vaccine development. EBioMedicine, 55, 102768. https://doi.org/10.1016/j.ebiom.2020.102768

Impact of immune enhancement on Covid-19 polyclonal hyperimmune globulin therapy and vaccine development.

1) An antibody bound virus has to bind to a receptor responsible for activating Fc, which leads to Fc-receptor mediated endocytosis or pahgocytosis. This allows the virus to enter into mononuclear cells, macrophages and dendritic cells that express the Fc receptor. 

First Requirement for ADE to occur 

Furthers studies need to be conducted to see if ADE plays a role in the pathogenesis of SARS-CoV-2. However, in-vitro studies highlight the possibility of ADE after infection with coronavirus. 

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