On Saturday 20 Feb 2021, Dr David Hu, a respiratory system expert who is advising the government on the pandemic said that the vaccines do not completely prevent people from catching the virus, but they do reduce the chance of developing symptoms or even complications. (Source:https://news.rthk.hk/rthk/en/component/k2/1576555-20210220.htm)
He advised elderly people who are in relatively poor health not to get vaccinated - regardless of the brand of vaccine - while those who suffer from high blood pressure and diabetes can get the shot as long as their condition is stable and under control.
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South Korean scientists finds THC stop SARS-CoV-2 replication and cytokine storm