One of the downsides of the vaccine is that, in a manner of speaking, it trains the virus to escape the immune response. This is known as “antibody-dependent enhancement of disease” and an explanation is here:
“As described, memory-type immune responses ensure the rapid rise of
antibody titres [the amount of antibodies found in a person’s blood]
after initial exposure to SARS-CoV-2, rendering the benefit of
vaccine-induced antibody response exceedingly doubtful. Regardless, we
should not assume that high antibody titres against SARS-CoV-2 will
always improve the clinical outcome. With several virus families—in
particular with Dengue virus, but also with coronaviruses—antibodies can
aggravate rather than mitigate disease. This occurs because certain
cells of the immune system take up antibody-tagged microbes and destroy
them. If a virus particle to which antibodies have bound is taken up by
such a cell, but it then manages to evade destruction, it may instead
start to multiply within the cell. Overall, the antibody will then have
enhanced the replication of the virus. Clinically, this
antibody-dependent enhancement (ADE) can cause a hyperinflammatory
response (a “cytokine storm”) that will amplify the damage to the lungs,
liver and other organs of our body.
“Attempts to develop vaccines to the original SARS virus, which is closely related to SARS-CoV-2, repeatedly failed due to ADE. The vaccines did induce antibodies, but when the vaccinated animals were subsequently infected with the virus, they became more ill than the unvaccinated controls (see e.g. [11]). The possibility of ADE was not adequately addressed in the clinical trials on any of the COVID-19 vaccines. It is therefore prudent to avoid the danger of inducing ADE through vaccination and instead rely on proven forms of treatment [12] for dealing with clinically severe COVID-19 disease.” https://doctors4covidethics.org/letter-to-physicians-four-new-scientific-discoveries-crucial-to-the-safety-and-efficacy-of-covid-19-vaccines/
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