The UK's official coronavirus symptoms list is too short, doctors have warned.
In Britain, the NHS online service lists three Covid-19 symptoms - a high temperature, a cough or breathlessness.
If the user responds saying they have none of them, they are told: "You're unlikely to have coronavirus ".
But in other countries, online tools appear to be more thorough.
In France, everyone is asked 23 questions to determine whether or not they have coronavirus.
They include whether the person has a loss of taste and smell, fatigue, or aches and pains.
Anyone who responds yes to the questions are then told to "monitor your condition carefully" and limit contact with other people.
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It also asks anyone if they have any underlying health conditions, such as diabetes or cancer.
People are also asked to input their height and weight, which allows the system to check their Body Mass Index (BMI), as being overweight can increase chances of developing the deadly bug.
In the US, citizens have access to a chatbot called 'Clara', which asks if they've had a cough, fever, or shortness of breath, before being asked if they've experienced nausea or diarrhea, fatigue, muscle aches, a headache, a sore throat or a runny nose.
Anyone who answers yes to any of those are asked to stay indoors and monitor the symptoms.
And in South Korea, the Centres for Disease Control has created a chatbot through the country's popular messaging operator, KakaoTalk, which is simiar to Whatsapp.
The service lists all the main symptoms, as well as diarrhoea or a runny nose.
Experts say Brits could be more at risk of getting Covid-19 due to the lack of questions or list of symptoms.
Jonathan Ball, professor of molecular biology at the University of Nottingham, told The Telegraph : “Throughout the outbreak I have been incredibly bothered by the [UK’s] restricted case definition.
“When you look at the medical reports describing how cases are presenting, particularly mild infections, coronavirus patients clearly have cold-like symptoms.
“Nobody at any other time would try and do a differential diagnosis for a respiratory virus based on symptoms alone. Yet here we are with a new virus relying on that because we don’t have the capacity to test.”
Public Health England defended the NHS symptom checker, saying it lists the most common symptoms of coronavirus.
They added the NHS 111 symptom checker follows the case definition set by the Chief Medical Officer, Professor Chris Witty.
Steve Powis, NHS England Chief Executive, speaking at a press briefing, said: “Like many viruses that give infections of the upper respiratory tracts. There is a range of symptoms.
"The two commonest are by far cough and a fever and that is exactly why they are the two symptoms that we are asking people to self-isolate if they get those symptoms.”
