After becoming the first country to administer the fourth dose of the COVID vaccine, Israeli research now claims that the second booster shot is insufficient to combat the omicron variant. Doctors at the Sheba Medical Centre initiated a trial in December 2021 to assess the efficacy of a fourth COVID dose. According to the trial results, while the booster increases antibody levels, there are still a lot of infections among people who had it, according to The Times of Israel. Also Read |Children become 'picky eaters' after being exposed to COVID-19, experts The second booster only provided half protection against the omicron strain, which has the ability to evade vaccination immunity. The vaccination, which was quite efficient against the previous strains, is less effective against the Omicron strain, said Prof. Gili Regev-Yochay, the experiment's principal researcher. We find a rise in antibodies, which is more than what we saw after the third dosage. However, we saw numerous omicron-infected people who received the fourth dose. While there were fewer infections than in the control group that did not receive the fourth dose, there was still a considerable number of them. Also Read |Omicron cases in Australia: What is Code Brown? All about the safety measures The bottom line is that the vaccination is fantastic against the Alpha and Delta (variants), but it's not good enough for Omicron, she explained. In December, Israel began providing fourth vaccination injections to persons aged 60 and above, the immunocompromised, and medical staff. While Regev-Yochay highlighted that giving the fourth injection to people at higher risk is still probably a good idea, it should only encompass older groups than only those over the age of 60. According to the story, she did not elaborate. Despite the absence of accurate data, Israel continued to extend the fourth dose experiment. According to the article, approximately 500,000 Israelis have received a fourth dose as of Sunday night. Also Read |Japan's omicron struggles set to trigger new COVID curbs: Officials Many nations, like Chile and Denmark, have followed suit, while others, such as Germany and France, are thinking about it. Meanwhile, the World Health Organization has encouraged governments to postpone booster vaccination campaigns until everyone in the world has access to the first vaccine doses.