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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.

More than 500 flights are expected to be operated in the fourth phase of Vande Bharat Mission, the “paid evacuation” mission of the government of India during covid-19 crisis.

This includes both Air India and private carriers who are ramping up their operations in a big way. 

Air India will be operating 170 flights till 15th of July to and from 17 countries, including Australia, Bahrain, Bangladesh, Canada, Germany, Japan, Kuwait, Malaysia, Oman, Saudi Arabia, Qatar and Philippines.

Private airlines such as IndiGo and GoAir will have significant participation in the fourth phase of Vande Bharat Mission. 

The Civil Aviation Ministry said that among others, Indigo will operate 238 flights from Qatar and 219 flights from Kuwait. GoAir will operate 41 flights from Kuwait. Phase Four will particularly focus on countries where there still are a large number of Indians who have registered to return.

Meanwhile, a record five lakh stranded Indians have returned safely to India under the Mission till now. The operations commenced on 7th May and in less than two months, nearly five lakh four thousand stranded Indians from 137 countries have returned to their homes.