Health officials are still collecting data for those who have received the Johnson & Johnson vaccine.
Anyone who had the Moderna or Pfizer vaccine is approved for a booster shot when the time comes.
So what does this mean for everyone else?
Infectious disease specialists and other experts say the Johnson & Johnson vaccine is doing its job still.
Evidence has shown vaccines effectiveness weakens over time, and is not as strong at preventing the Delta variant as it was earlier strains.
Reasons a booster hasn’t been released for the Johnson & Johnson are because it came out later than the other two, and it works entirely differently.
There is more data available for Moderna and Pfizer because more people chose to get those vaccines.
A study done in South Africa on health workers that received the Johnson & Johnson vaccine showed it was still 71% effective when preventing COVID infections and 91-97% effective at preventing Delta related deaths. Breakthrough infections also appeared to be mild among vaccinated individuals.
Other data from studies show the vaccine protects against Delta for up to 8 months.
Right now, Johnson & Johnson are actively studying whether a two dose approach would be more effective than the previous one dose.
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