Delta variant warning: Troubling sign you'll need second dose of Johnson & Johnson vaccine

In an environment where no one is vaccinated and no one is wearing a mask, coronavirus will likely infect 2.5 other people.

However, Dr F. Perry Wilson of Yale Medicine said: “In the same environment, Delta would spread from one person to maybe 3.5 or 4 other people.”

A new study published by researchers at the New York University Grossman School of Medicine suggests the Johnson & Johnson vaccine is proving less effective against Delta than it is against the original strain.

The study’s authors told The New York Times people might have to consider getting a booster jab.

The UK has approved four vaccines for use: AstraZeneca, Pfizer, Moderna and Johnson & Johnson.

Virologist Nathaniel Landau said: “The message that we wanted to give was not that people shouldn’t get the J&J vaccine, but we hope that in the future, it will be boosted with either another dose of J&J or a boost with Pfizer or Moderna.”

The researchers collected blood samples from 17 people who had two doses of an mRNA vaccine administered and compared them to blood samples from 10 people with the single-dose Johnson & Johnson jab.

Their results suggest the Johnson & Johnson vaccine was less effective than the mRNA jabs, particularly against the Delta and Lambda variants.

source: express.co.uk