London: The head of the World Health Organization said the U.N. health agency will not recommend any COVID-19 vaccine before it is proved safe and effective, even as Russia and China have started using their experimental vaccines before large studies have finished and other countries have proposed streamlining authorization procedures.

At a press briefing on Friday, Tedros Adhanom Ghebreyesus said vaccines have been used successfully for decades, and credited them with eradicating smallpox and bringing polio to the brink of being eliminated.

I would like to assure the public that WHO will not endorse a vaccine that's not effective and safe, Tedros said. He said newly developed Ebola vaccines helped end the recent Ebola outbreak in Congo, noting that stopping the deadly virus was complicated by the dozens of armed groups operating in the region.

Tedros appealed to people opposed to vaccination to do their own research.

The anti-vaccine movement, they can build narratives to fight against vaccines but the track record of vaccines tells its own story and people should not be confused, he said, appealing to parents in particular.

They can have a look for themselves on how the world actually used vaccines to reduce under-5 mortality to save children. Last week, Britain said it was preparing to revise its laws so that any effective coronavirus vaccine could be used before it was fully licensed.

Russia became the first country in the world to approve a COVID-19 vaccine in August after licensing a shot that had only been tested in several dozen people.

On Friday, Russian scientists published data from early studies suggesting their vaccine was safe and prompted an antibody response, but the results were limited and experts said the shot had not yet proven to work. The Russian vaccine, known as Sputnik V, is now being tested in about 40,000 people and is being offered in parallel to key workers like doctors and teachers.

Among those who have received it are one of President Vladimir Putin's daughters and Defense Minister Sergei Shoigu.

China has reportedly begun inoculating some high-risk groups with one of its experimental coronavirus vaccine while the large studies to prove its efficacy and safety are ongoing. In July, the head of China's Center for Disease Control and Prevention announced that he had received the shot, although he did not specify whether that was done as part of a clinical trial.

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New Delhi (PTI): The New Year evening was streaked with blood with three almost back-to-back stabbings leaving an equal number of people dead in Delhi.

Bihari Lal, 50, was allegedly stabbed in an attack by a group of juveniles when he asked them to stop shouting and playing loud music in northwest Delhi's Lal Bagh area.

A tailor by profession, Bihari Lal had just returned home Thursday evening from his job in Shastri Nagar, when he was faced with a raucous mob of revellers, whom he chastised for making noise.

"This led to a heated exchange, during which one of the juveniles stabbed Lal," a police officer said, adding that one of the boys kicked the victim several times during the fight.

Bihari Lal was rushed to Babu Jagjivan Ram Memorial Hospital, where doctors declared him dead.

Police apprehended a juvenile in connection with the killing and seized the weapon of the crime. A hunt for the rest involved in the fight is on.

An FIR was registered at the Adarsh Nagar Police Station, and investigators are examining eyewitness accounts and CCTV footage from the area.

Bihari Lal's family and neighbours alleged that the group was notorious for creating disturbance in the area.

"He had just returned from duty and was parking his cycle when they came and started abusing everyone, throwing buckets, boxes and people's belongings. Bihari Lal only told them not to use abusive language and shout, as there were women and children around. That was all he said," Dimple, a neighbour, recounted.

Pushpa, a relative, alleged that the group had been terrorising residents for some time. "They keep throwing bottles, stones and sticks, and nobody does anything. We complained earlier, but no action was taken. The police never did anything," she said.

Pushpa said four boys were involved in the attack and "they stabbed him three times."

Hours later, in outer Delhi's Mangolpuri, an e-rickshaw driver, Vikas, was stabbed in a fight.

According to police, Vikas and his friend Sandeep, a daily-wage labourer, both aged 20, were sitting together when a group of youths started a fight with them.

"During the altercation, one of the accused stabbed Vikas, causing fatal injuries. Sandeep also suffered a minor lacerated wound," an officer said.

Both were taken to a nearby hospital, where Vikas was declared dead.

Preliminary investigation revealed that the victims and the attackers had bad blood, police said.

All six accused, four of them underage, involved in the stabbing were apprehended, police said.

The same evening, a 15-year-old boy was stabbed to death in nearby Sultanpuri.

Around 11.30 pm, police were informed that a group of men had attacked a minor with a knife.

"A police team rushed to the spot and found the injured boy lying on the road with multiple stab wounds," an officer said.

The victim, whose identity was not revealed by the police, was rushed to a hospital, where he was declared dead.

Vikram, a man aged about 30 with a history of crime, was arrested for allegedly killing the boy.

During interrogation, Vikram, who police said has six criminal convictions, revealed that two more men were with him at the time of the stabbing. A search for them has been launched.

The boy's mother said her son had been threatened several times before by the attackers, but police took no action.

"My son had gone out only to get some juice when a few people started abusing him, and a fight broke out. I ran downstairs from my sister's house and begged them not to harm my son. Instead, they took out a knife and attacked me. I somehow ran into a shop, where I saw my son being stabbed in front of my eyes," the boy's mother, Bali, said.

She said that the accused had earlier also entered her house armed with weapons. "I informed the police, but no action was taken."

The boy was her only son.

The motive of the killing is yet to be ascertained by the police.