Covid-19 patients whose conditions are serious enough to require supplementary oxygen should not delay seeking medical help, said Dr Boo Cheng Hau.

In a Facebook post today, he shared the case of a 46-year-old patient whose chest X-rays revealed damage that is consistent with Stage 4 Covid-19.

Boo (above) said the patient had been using supplementary oxygen at home without medical supervision, thanks to an oxygen concentrator...