Hyposmia - a change in sense of smell - has been added to the top 10 most prevalent Covid symptoms as cases rise in most parts of the UK.
In England, infections are estimated to have climbed above one million for the first time since the end of October, while Scotland and Wales have also both seen an increase.
The total number of people in private households in the UK testing positive for coronavirus stood at an estimated 1.3 million in the week to December 5, according to the Office for National Statistics (ONS).
This is up 16% from 1.1 million in the previous week, but is still well below levels reached earlier this year.
As cases rise, the ZOE Health Study has continued to track the top Covid symptoms and how they develop over time.
According to its latest data from the 30 days before December 5, an altered sense of smell is now the 10th most common sign of the virus.
A sore throat is currently the most reported symptom, followed by a runny nose, blocked nose, sneezing, a cough without phlegm, a headache, a cough with phlegm, a hoarse voice and muscle aches and pains.
ZOE said the previous "traditional" symptoms, such as loss of smell (anosmia), a fever and shortness of breath, are much less prevalent than they used to be.
It added: "In the list of common symptoms, anosmia ranks 14th, and shortness of breath ranks 16th. Anosmia used to be a key indicator of COVID-19, but only about 16% of people with the illness now experience it."
The symptom list was compiled using contributor reports in the app, and doesn’t take into account which variant caused the infection or any demographic information.
It comes as people mix more indoors, likely driving the recent jump in infections, while other winter viruses such as flu are circulating more widely.
During the main waves of coronavirus earlier in 2022, the total peaked at nearly four million in July and just under five million in March.
Michelle Bowen, ONS head of health surveillance, said infections have begun to increase again across "most of the UK", though "the trend varies across the English regions and ages".
"We will continue to monitor the data carefully as the winter months progress," she added.
The latest figures suggest the UK is facing its third winter in a row with Covid-19 on the rise.
But unlike in 2020 and 2021, when coronavirus was the main driver of sickness and hospitalisations, this winter is seeing other viruses becoming more prevalent.
Flu is now "circulating widely" across the country, with a sharp increase in hospital cases last week, particularly among the over-85s and children under five, according to the UK Health Security Agency (UKHSA).
In England, the rate of hospital admissions for flu has overtaken those for people with Covid-19 for the first time since the pandemic began, and is now running at a higher level than in any week since the 2017/18 season.
Dr Jamie Lopez Bernal, UKHSA consultant epidemiologist for immunisation, said: "We're seeing rises in flu, Covid and other winter viruses as people mix more indoors.
"Covid hospitalisations are highest in the oldest age groups, so it is particularly important that everyone who is eligible continues to come forward to accept their booster jab.
"While Covid-19 and flu can be mild infections for many, we must not forget that they can cause severe illness or even death for those most vulnerable in our communities."
