Dr Paul Cosford, acting Chief Executive of Health Protection Agency, has told Daybreak that the UK must develop new antibiotics.
He said: "When a bug becomes resistent to an antibiotic, we need to use new antibiotics and there aren't that many antibiotics in the pipeline."
More top news
The shadow chancellor appeared to differ from his leader, who had been initially reluctant to blame the Kremlin for the ex-spy attack.
The Foreign Secretary said the Kremlin's tit-for-tat expulsion of 23 British diplomats would only impact Vladimir Putin's compatriots.
Sunday will be bitterly cold with snow for most.