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French Nobel prize winning scientist Luc Montagnier has sparked a fresh controversy by claiming that the SARS-CoV-2 virus came from a lab, and is the result of an attempt to manufacture a vaccine against the AIDS virus.

In an interview given to French CNews channel and during a podcast by Pourquoi Docteur, professor Montagnier who co-discovered HIV (Human Immunodeficiency Virus) claimed the presence of elements of HIV in the genome of the coronavirus and even elements of the "germ of malaria" are highly suspect, according to a report in Asia Times.

"The Wuhan city laboratory has specialized in these coronaviruses since the early 2000s. They have expertise in this area," he was quoted as saying.

The theory that Covid-19 virus originated in the lab is making rounds for quite some time.

US President Donald Trump last week acknowledged Fox News report that the novel coronavirus may have been accidentally leaked by an intern working at the Wuhan Institute of Virology in China.

The Fox News, in an exclusive report, based on unnamed sources has claimed that though the virus is a naturally occurring strain among bats and not a bioweapon, but it was being studied in Wuhan laboratory.

The initial transmission of the virus was bat-to-human, the news channel said, adding that the "patient zero" worked at the laboratory. The lab employee was accidentally infected before spreading the disease among the common people outside the lab in Wuhan city.

Professor Montagnier was awarded the 2008 Nobel Prize in Medicine for the identification of AIDS virus, with his colleague professor Franeoise Barre-Sinoussi.

His fresh claim on coronavirus, however, received criticism from scientists, including his colleagues.

"Just in case you don't know. Dr Montagnier has been rolling downhill incredibly fast in the last few years. From baselessly defending homeopathy to becoming an antivaxxer. Whatever he says, just don't believe him," tweeted Juan Carlos Gabaldon.

As per a recent Washington Post, two years ago, the US embassy officials in China raised concerns about the insufficient biosafety at the Chinese government's Wuhan Institute of Virology where deadly viruses and infectious diseases are studied.

Though the institute, located quite close to the Wuhan wet market, is China's first biosafety level IV lab, the US state department had warned in 2018 about "serious shortage of appropriately trained technicians and investigators needed to safely operate this high-containment laboratory".

New Delhi, Jun 13: Loss of smell or taste has been added to the list of COVID-19 symptoms, according to the revised clinical management protocols released by the Union Health Ministry on Saturday.

The ministry said that coronavirus-infected patients reporting to various COVID-19 treatment facilities have been reporting symptoms like fever, cough, fatigue, shortness of breath, expectoration, myalgia, rhinorrhea, sore throat and diarrhea.

They have also complained of loss of smell (anosmia) or loss of taste (ageusia) preceding the onset of respiratory symptoms.

Older people and immune-suppressed patients in particular may present with atypical symptoms such as fatigue, reduced alertness, reduced mobility, diarrhoea, loss of appetite, delirium, and absence of fever, the ministry said.

Children might not have reported fever or cough as frequently as adults.

The US's national public health institute, the Centers for Disease Control and Prevention (CDC), had in early May incorporated "a new loss of taste or smell" in the list of COVID-19 symptoms.

According to the data from Integrated Health Information Platform and Integrated Disease Surveillance Programme, portal case investigation forms for COVID 19 (n=15,366), the details on the signs and symptoms reported are (as on June 11), fever (27 per cent), cough (21 pc), sore throat (10 pc), breathlessness (8 pc), Weakness (7 pc), running nose (3pc ) and others 24 pc.

According to the health ministry, people infected by the novel coronavirus are the main source of infection.

Direct person-to-person transmission occurs through close contact, mainly through respiratory droplets that are released when the infected person coughs, sneezes, or talks.

These droplets may also land on surfaces, where the virus remains viable. Infection can also occur if a person touches an infected surface and then touches his or her eyes, nose, or mouth.

The median incubation period is 5.1 days (range 2–14 days). The precise interval during which an individual with COVID-19 is infectious is uncertain.

As per the current evidence, the period of infectivity starts 2 days prior to onset of symptoms and lasts up to 8 days.

The extent and role played by pre-clinical/ asymptomatic infections in transmission still remain under investigation.