Doctors in the US have updated their official symptoms of coronavirus after doctors reported seeing them time and again.
Initially, the Centre for Disease Control (CDC) listed just three symptoms for Covid-19 which were: shortness of breath, a cough and a fever.
But as doctors have learned more about the deadly bug, which has claimed the lives of more than 20,000 people in the UK, they have updated their list of symptoms.
The CDC in America now reports the symptoms which could appear between two to 14 days of exposure to the virus as: ChillsRepeated shaking with chillsMuscle painHeadacheSore throatNew loss of taste or smell
In an Iranian study, 76% of Covid-19 patients who reported a loss of smell said it had a sudden onset. In many of the cases, anosmia, as it’s called, appeared before other symptoms.
Vallery Lomas, a 34-year-old champion baker, told the Washington Post: “It scared the hell out of me.
“I could smell nothing for probably five days.”
Professor Claire Hopkins, president of the British Rhinological Society and a leading ear, nose and throat consultant surgeon, is leading the charge to get loss of sense of smell recognised by the World Health Organization and Public Health England as a coronavirus symptom.
Prof. Hopkins said: "One in six patients will lose their sense of smell as an isolated symptom, really without getting any other associated symptoms.
"One in four will get it along with other symptoms, but right at the beginning of infection.
"It is a good early marker of infection."
She added: "When you look at all the different symptoms, loss of sense of smell is actually one of the best predictors of Covid-19 infection.
"Much better than fever, and more prevalent and a stronger predictor than cough."
In France, researchers are preparing to launch a human trial to test their hypothesis that nicotine can help the body combat the Covid-19 infection.
The scientists hypothesised in their study that nicotine, which is contained in cigarettes, could influence whether or not the coronavirus molecules are able to attach themselves to receptors in the body.
"You have the virus which arrives on the receptor, and the nicotine blocks that, and they separate," said Jean-Pierre Changeux, emeritus professor of neuroscience at France's Pasteur institute, describing the hypothetical process.