The healthy vaccinee effect may distort views on COVID vaccine success. No randomized trials have tracked efficacy since registration amid virus changes and rising natural immunity. This creates confusion in understanding real protection levels.
Since the initial trials for COVID-19 vaccines, experts have conducted no new randomized studies on their performance. The virus has changed over time through mutations. At the same time, more people have recovered from infection and gained natural protection. These factors make the early reported efficacy numbers less reliable today.
The healthy vaccinee effect adds another layer of complexity. People who choose to get vaccinated often lead healthier lives overall. They may have better access to care and fewer underlying health issues. This group difference can make vaccines appear more effective than they truly are in mixed populations.
Joint research highlights how these biases create a hall of mirrors. Data from observational studies can mislead without proper adjustments. As natural immunity grows and variants emerge, understanding true vaccine benefits requires careful analysis beyond simple comparisons.
Original Author: Tomas Fürst | Source: Brownstone Institute
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