COVID-19 Immunity Created in Various Ways
The WSJ reported on November 27, 2021, clinical evidence is increasing that SARS-CoV-2 coronavirus infection provides similar protection as COVID-19 vaccines. These findings prompted some experts to suggest a nuanced approach to COVID-19 vaccine mandates in the U.S.
However, COVID-19 vaccination is a proven means of reducing severe COVID-19 illness or death.
Immunity to disease results when antibodies are developed in a person's system to that particular disease, says the U.S. CDC.
Immunity can be defined as either active or passive.
Active immunity occurs when the immune system produces antibodies to the disease.
Antibodies can be made in two ways: when an individual is exposed to the disease resulting in natural immunity, or when the individual is vaccinated, typically with a killed or weakened form of the disease, resulting in vaccine-induced immunity.
Passive immunity is through antibody-containing blood products such as immune globulin.
The significant advantage to passive immunity: protection is immediate, whereas active immunity takes time (usually several weeks) to develop.
Natalie J. Thornburg, Ph.D., Lead respiratory virus immunology, CDC, presented 'Adaptive immunity and SARS-CoV-2' to the Advisory Committee on Immunization Practices meeting on September 22, 2021.
'Available evidence shows that fully vaccinated individuals and those previously infected with SARS-CoV-2 each have a low risk of subsequent infection for at least six months.'
'However, data are presently insufficient to determine an antibody titer threshold that indicates when an individual is protected from infection.'
'The immunity provided by vaccine and prior infection are both high but not complete.'
As of November 24, 2021, GAVI confirmed there are 21 COVID-19 vaccines now being rolled out worldwide. Of these vaccines, the WHO has Listed eight COVID-19 vaccines.
And in the U.S., the FDA has approved/authorized three vaccines.