There's an increased risk of hospitalisation too
Dr Cillian de Gascun has said there are three main issues that NPHET are considering with regards to the Delta variant; transmissibility, infection severity and its impact on pre-existing immunity and vaccine effectiveness.
In terms of its epidemiological structure, the Delta variant has an increased growth rate and secondary attack rate, increased household transmission and laboratory evidence of increased replication in biological systems that model the human airway. In a post online, the doctor said: "However, we do see a reduction in vaccine effectiveness for Delta compared with Alpha against symptomatic infection, particularly after one dose. Although this is concerning, VE against Delta is high after two doses, and VE against hospitalisation is maintained.
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