SINGAPORE, June 27 — Without more scientific data supporting the exact parameters for the easing of Covid-19 restrictions, Singapore’s vaccination milestones for opening up will have to balance the risk of infection against the social and economic consequences of shutting down for too long, infectious disease experts told TODAY.
Noting that the Delta variant of the coronavirus which originated in India is more transmissible by at least 60 per cent, he said: “Once the healthcare system is overloaded, everything will crash very quickly.” “Look at Bukit Merah. Look at the resources that were thrown at it. We are at best able to curtail the growth of the virus, but no way are we able to control it.”
On Thursday, Ong said that the two-thirds milestone is “actually not enough”. “We need to go further than two-thirds, especially given the transmissibility of the Delta variant,” he said. The effectiveness of a vaccine can be influenced by the transmissibility of the virus, the evolution of the virus to escape the pre-existing immunity, and whether the vaccine can elicit long-lasting immune memory to protect against the virus, she said.
Prof Leo, however, noted that countries that have had 50 per cent or more of its residents vaccinated at the moment are mostly developed countries that were “hit badly”, which meant that they would have built up a pool of naturally infected people with the necessary antibodies. Dr Paul Tambyah, president of the Asia Pacific Society of Clinical Microbiology and Infection, said there are no experiments showing how many people can dine together or how many can be in a meeting room in published literature as yet.
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