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San Diego, Apr 15: Several people lost their sense of smell or taste weeks ago globally and are still waiting for it to come back and now, researchers have identified an association between sensory loss and novel coronavirus 2019 (COVID-19) infection, indicating that loss of smell and taste may be considered as early symptoms of the deadly disease.

Interestingly, the study also found that persons who reported experiencing a sore throat more often tested negative for COVID-19.

The team from University of California-San Diego found high prevalence and unique presentation of certain sensory impairments in patients positive with COVID-19.

Of those who reported a loss of smell and taste, the loss was typically profound, not mild.

"Based on our study, if you have smell and taste loss, you are more than 10 times more likely to have COVID-19 infection than other causes of infection. The most common first sign of a COVID-19 infection remains fever, but fatigue and loss of smell and taste follow as other very common initial symptoms," explained study researcher Carol Yan from UC San Diego.

"We know COVID-19 is an extremely contagious virus. This study supports the need to be aware of smell and taste loss as early signs of COVID-19," Yan added.

For the findings, published in the journal International Forum of Allergy and Rhinology, the research team surveyed 1,480 patients with flu-like symptoms and concerns regarding potential COVID-19 infection who underwent testing at UC San Diego Health from March 3 through March 29, 2020.

Within that total, 102 patients tested positive for the virus and 1,378 tested negatives. The study included responses from 59 COVID-19-positive patients and 203 COVID-19-negative patients.

Encouragingly, the rate of recovery of smell and taste was high and occurred usually within two to four weeks of infection.

"Our study not only showed that the high incidence of smell and taste is specific to COVID-19 infection but we fortunately also found that for the majority of people sensory recovery was generally rapid," said Yan.

"Among the COVID-19 patients with smell loss, more than 70 per cent had reported improvement of smell at the time of the survey and of those who hadn't reported improvement, many had only been diagnosed recently," she added.

Sensory return typically matched the timing of disease recovery.

In an effort to decrease the risk of virus transmission, UC San Diego Health now includes loss of smell and taste as a screening requirement for visitors and staff, as well as a marker for testing patients who may be positive for the virus.

"It is our hope that with these findings other institutions will follow suit and not only list smell and taste loss as a symptom of COVID-19, but use it as a screening measure for the virus across the world," Yan said.

New Delhi, Mar 29: "What corona? My children are hungry, they have walked from Gurugram with me do you think corona is what I fear?," Yogesh Gangwar who is salesman in a cloth showroom said as he wiped his tears.

Many others regret for not leaving the city early on.

"God knows when we will reach our hometown. My family was telling me to leave work early in March and get back, but I avoided suggestions and now I am stranded here," Babu Ram who hails from Rampur and works at a plastic recycling factory here in Mundka told media.

Migrant labourers were forced to walk as the public transport were closed and borders were sealed due to the lockdown.

"There is no food to eat, I cannot pay rent of room without my daily wages so I decided to walk with my family from Narela to here. I just hope I get a bus soon," Revati, who works as construction labour said as she fed her three-year-old with pieces of bread that one of the policemen at Anand Vihar gave her.

However, when Yogi Adityanath-led BJP government in Uttar Pradesh decided to deploy around 1,000 buses to help these workers reach their respective hometowns, thousands of them reached Anand Vihar ISBT with a hope to catch one of these buses.

The Delhi government also announced that 100 buses have been deployed to help those trying to reach to their homes in other states on foot.

In order to avoid the spread of the virus, the police asked the people to stand in three queues and also asked the people to de-board the overcrowded buses.

Earlier, budget passenger carrier SpiceJet had offered its aircraft to operate few flights from Delhi and Mumbai to Patna to take migrant labourers, particularly from Bihar, who have got stuck in various parts of the country due to COVID-19 related lockdown.