A study is published in the journal 'The Lancet Microbe' shows us that the immunity which we gain after natural infection is short-lived. Remaining unvaccinated can increase the risk of getting re-infected with COVID-19.
During the pandemic, there were many confusions about how long immunity lasts after someone who is unvaccinated is infected with SARS-CoV-2.
Lead author Jeffrey Townsend, Professor of Biostatistics at the Yale School of Public Health said, "Re-infection can reasonably happen in three months or less.Therefore, those who have been naturally infected should get vaccinated. Previous infection alone can offer very little long-term protection against subsequent infections."
The researchers had analysed known re-infection and immunological data from various sources and Covid cases. They concluded that re-infections can and have happened, even shortly after recovery and they will become increasingly common as immunity wanes and new SARS-CoV-2 variants arise.
The research doctor’s data-driven model shows striking similarities to the re-infection risks over time between SARS-CoV-2 and endemic coronaviruses.
"Just like common colds, from one year to the next you may get re-infected with the same virus. The difference is that, during its emergence in this pandemic, COVID-19 has proven to be much more deadly," Townsend said.
Everyone should be vaccinated and can then only escape from the Covid-19 virus.