Covid-19 vaccine effectiveness declines after 6 months without boosters, says study
Zee News
"This data helps us understand differences in waning protection by vaccine type and identify the key risk factors for severe breakthrough infections to help inform the targeting of potential vaccine booster programmes," said Amy Compton-Phillips.
New York: The effectiveness of the Covid-19 vaccine may substantially decline after six months if booster shots are not taken, according to a new study published in The Lancet Respiratory Medicine.
The study indicated that vaccines were 94 per cent effective at preventing hospitalisation 50-100 days after receiving the shot but fell to 80.4 per cent 200-250 days later, with even more rapid declines after 250 days.
"This data helps us understand differences in waning protection by vaccine type and identify the key risk factors for severe breakthrough infections to help inform the targeting of potential vaccine booster programmes," said Amy Compton-Phillips, Providence chief clinical officer.
"Unlike most other studies, our data stretched beyond six months, where we found evidence of rapidly waning protection, especially for patients 80 or older," Compton-Phillips added.
In addition to examining the effectiveness of vaccines over time, the Providence study was also able to identify factors associated with reduced vaccine effectiveness.
