Khairy explains why herd immunity no longer realistic

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Last year, Malaysia had set the goal of vaccinating 70 percent of its population against Covid-19 in order to achieve herd immunity against the disease, and thus facilitate a return to pre-pandemic normalcy.With the appearance of the Delta variant, however, Health Minister Khairy Jamaluddin said achieving herd immunity is no longer considered realistic due to two factors – the variant’s high transmissibility, and vaccines’ reduced effectiveness against it.He told a press conference yesterday that the vaccine coverage needed to reach herd immunity is calculated based on the disease’s basic reproduction number (R0).The higher the R0, the greater the vaccine coverage needed. Once the threshold is reached, then the disease can be brought under control or even eradicated even if some people are still unvaccinated.R0 is a measure of a disease’s transmissibility. For example, an R0 o…