https://www.mercurynews.com/2021/08/18/new-data-shows-waning-covid-19-vaccine-efficacy-building-case-for-boosters/

COVID-19 vaccines are losing their effectiveness against infection over time and might become less protective in preventing severe illness and death, the nation’s top health officials said Wednesday.

These new medical findings, announced at a White House press briefing, are spurring the campaign to boost Americans’ immunity by administering a third dose of the vaccine.