FluBlok, a DNA-based vaccine grown in caterpillar cells, was more effective in preventing influenza infection than vaccines made using chicken eggs, according to an NEJM study reported by NBC News.

A study of about 9,000 people showed FluBlok was about 30% more effective than a standard flu vaccine in preventing influenza infection, researchers said.

In a head-to-head comparison of FluBlok versus GlaxoSmithKline’s egg-grown vaccine, 2.2% of volunteers who got FluBlok had confirmed influenza infection compared to 3.2% of those who had been given Glaxo’s vaccine.

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