Pfizer and BioNTech jointly announced that they were developing a Covid-19 booster shot intended to target the highly transmissible Delta variant, according to US media reports.

Pfizer and BioNTech said they believe a third shot of their current two-dose vaccine has the potential to preserve the "highest levels" of protection against all currently known variants, including Delta, but they are "remaining vigilant" and developing an updated version of the vaccine, a CNBC News report said.

The company's official written statement reads:  “As seen in real-world evidence released from the Israel Ministry of Health, vaccine efficacy has declined six months post-vaccination, at the same time that the Delta variant is becoming the dominate variant in the country,”  "These findings are consistent with an ongoing analysis from the companies' Phase 3 study," it added.

Executives from Pfizer and BioNTech have said people will likely need a booster shot, or third dose, within 12 months of getting fully vaccinated because they expect vaccine-induced immunity to wane over time.

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