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Washington, May 27: Most viruses and other germs do not spread easily on flights, the US Center for Disease Control and Prevention has said in its COVID-19 guidelines which do not recommend following social distancing between two passengers inside a plane or keeping the middle seat unoccupied.

As a result of coronavirus pandemic, air traffic inside the US has come to a near halt. Air traffic is said to be down to about 90 per cent. For all travellers coming from overseas, the Center for Disease Control and Prevention (CDC) has recommended 14 days quarantine.

"Most viruses and other germs do not spread easily on flights because of how air circulates and is filtered on aeroplanes," the CDC has said in its set of COVID-19 guidelines for air travellers.

However, it noted that the air travellers were not risk-free especially in the time of the coronavirus pandemic and recommended Americans to avoid travel as far as possible.

"Air travel requires spending time in security lines and airport terminals, which can bring you in close contact with other people and frequently touched surfaces," it said.

"Social distancing is difficult on crowded flights, and you may have to sit near others (within six feet), sometimes for hours. This may increase your risk for exposure to the virus that causes COVID-19," the CDC said.

But instead of recommended social distancing inside commercial planes, the CDC has advised a series of preventive and hygienic measures to be taken by the airlines pilot and crew to prevent the spread of coronavirus.

The US Department of Transportation and Federal Aviation Administration in its latest safety alerts for operators on May 11 said that air carriers and crews conducting flight operations having a nexus to the US, including both domestic and foreign air carriers, should follow CDC's occupational health and safety guidance.

The CDC issued its guidelines in first guidelines for the airlines and airline crew on March and again in May.

The CDC, which has issued an exhaustive social guideline measures in various sections, is silent on keeping the middle seat of a plane unoccupied so as to maintain the six feet distance between two passengers.

It calls for the plane crew to report to the CDC a traveller with specific COVID-19 symptoms like fever, persistent cough, difficulty in breathing and appearing unwell.

Asking the airlines and cabin crew to review infection control guidelines for cabin crew, the CDC recommends several measures for cabin crew to protect themselves and others, manage a sick traveller, clean contaminated areas, and take actions after a flight.

Prominent among them include washing hands often with soap and water for at least 20 seconds, particularly after assisting sick travellers or touching potentially contaminated body fluids or surfaces and use of alcohol-based hand sanitizer (containing at least 60 per cent alcohol) if soap and water are not available.

Airlines should consider providing alcohol-based hand sanitizer to cabin and flight crews for their personal use, it said.

The CDC guidelines do not recommend following social distancing inside a plane between two passengers or keeping the middle seat unoccupied. But it asks to minimise contact between passengers and cabin crew and the sick person.

"If possible, separate the sick person from others (by a distance of 2 meters or 6 feet, ideally) and designate one crew member to serve the sick person. Offer a facemask, if available and if the sick person can tolerate it. If a facemask is not available or cannot be tolerated, ask the sick person to cover their mouth and nose with tissues when coughing or sneezing," said the CDC guidelines.

If no symptomatic passengers were identified during or immediately after the flight, the CDC recommends airlines to follow routine operating procedures for cleaning aircraft, managing solid waste, and wearing PPE.

"If symptomatic passengers are identified during or immediately after the flight, routine cleaning procedures should be followed, and enhanced cleaning procedures should also be used," it said.

Clean porous (soft) surfaces (e.g, cloth seats, cloth seat belts) at the seat of the symptomatic passengers and within 6 feet of the symptomatic passengers in all directions, it added.

New Delhi, May 22: The number of COVID-19 cases averted due to the lockdown is in the range of 14-29 lakh, while the number of lives saved is between 37,000 and 78,000, the government said on Friday citing various studies, and asserted that the unprecedented shutdown has paid “rich dividends” in the fight against the pandemic.

The lockdown in India has been a timely, graded, proactive and pre-emptive public health measure to fight the COVID-19 pandemic and has been part and parcel of the government’s overall strategy, Dr V K Paul, Member (Health), NITI Aayog, and Chairman, Empowered Group 1, said at a media briefing on the COVID-19 situation.

The government imposed the nationwide lockdown from March 25 to prevent the spread of the novel coronavirus and it is currently in its fourth phase.

Like the number of cases, the growth rate of number of COVID-19 deaths too has fallen significantly due to the lockdown, marking a notable difference between pre-lockdown and post-lockdown situations, he said.

At the briefing, Pravin Srivastava, Secretary, Ministry of Statistics and Programme Implementation gave model-based estimates on COVID-19 cases and deaths which have been prevented due to the lockdown.

As per Boston Consulting Group's model, the lockdown saved between 1.2 lakh and 2.1 lakh lives, while the number of COVID-19 cases averted is between 36 lakh and 70 lakh, he said.

According to Public Health Foundation of India, nearly 78,000 lives have been saved due to the lockdown, Srivastava said.

Citing a model by two independent economists, he said that around 23 lakh COVID-19 cases and 68,000 deaths have been averted due to the lockdown.

Some independent experts, including retired scientists, have calculated that around 15.9 lakh cases and 51,000 deaths have been averted due to the lockdown, Srivastava said.

A joint study by the Ministry of Statistics and Programme Implementation and the Indian Statistical Institute found that around 20 lakh COVID-19 cases and 54,000 deaths were averted due to lockdown, he said.

The number of COVID-19 cases averted due to the lockdown is in the range of 14-29 lakh, while the number of lives saved is between 37,000 and 78,000, the official said.

“We are fully confident that the lockdown, with full public cooperation, has reaped rich dividends,” Srivastava said.

The strong defence of the lockdown, comes a day after the health ministry said the period of lockdown has been gainfully utilized to ramp up the health infrastructure, with around 3,027 dedicated COVID-19 hospitals and 7,013 care centres being readied across the country to fight the disease.

The announcement on Thursday came after some media reports questioned the country's preparedness to deal with the highly infectious disease.

"There are reports in a section of the media about some decisions of the government regarding the lockdown implementation and response to COVID-19 management. The period of the lockdown has been gainfully utilised to ramp up the health infrastructure in the country," the ministry had said.

Addressing the press briefing on Friday, joint secretary in the health ministry Lav Agarwal said 48,534 COVID-19 patients, which is about 41 per cent of the total cases, have recovered so far. As many as 3,234 patients have recovered in the last 24 hours, he said’

The COVID-19 mortality rate has dropped from 3.13 per cent on May 19 to 3.02 per cent as focus was on containment measures andclinical management of cases, Agarwal said.

An ICMR official said 27,55,714 tests for COVID-19 have been conducted till 1 pm Friday with 1,03,829 tests done in one day. Over 1 lakh tests for COVID-19 have been done each day for the last four days, the official said.

The growth rate of novel coronavirus cases witnessed a steep decline from Apr 4 when lockdown put a brake on the speed of increase of cases, V K Paul said.

The number of COVID-19 cases would have risen exponentially had the lockdown not been implemented, he said, adding that the doubling rate of cases was 3.4 days when the lockdown started and it is 13.3 days at present.

The COVID-19 outbreak in India has remained confined to limited areas with 80 per cent of active cases in just five states, Paul said

He said around 80 pc of COVID-19 deaths have been in Maharashtra, Gujarat, Madhya Pradesh, West Bengal and Delhi. 

Jun 13: Requiring the wearing of masks to prevent the spread of the novel coronavirus in areas at the epicenter of the global pandemic may have prevented tens of thousands of infections, a new study suggests.

Mask-wearing is even more important for preventing the virus' spread and the sometimes deadly COVID-19 illness it causes than social distancing and stay-at-home orders, researchers said, in the study published in PNAS: The Proceedings of the National Academy of Sciences of the USA.

Infection trends shifted dramatically when mask-wearing rules were implemented on April 6 in northern Italy and April 17 in New York City - at the time among the hardest hit areas of the world by the health crisis - the study found.

"This protective measure alone significantly reduced the number of infections, that is, by over 78,000 in Italy from April 6 to May 9 and over 66,000 in New York City from April 17 to May 9," researchers calculated.

When mask-wearing went into effect in New York, the daily new infection rate fell by about 3% per day, researchers said. In the rest of the country, daily new infections continued to increase.

Direct contact precautions - social distancing, quarantine and isolation, and hand sanitizing - were all in place before mask-wearing rules went into effect in Italy and New York City. But they only help minimize virus transmission by direct contact, while face covering helps prevent airborne transmission, the researchers say.

"The unique function of face covering to block atomization and inhalation of virus-bearing aerosols accounts for the significantly reduced infections," they said. That would indicate "that airborne transmission of COVID-19 represents the dominant route for infection."

The U.S. Center for Disease Control and Prevention on Friday urged organizers of large gatherings that involve "shouting, chanting or singing to strongly encourage the use of cloth face coverings to lower the risk of spreading the coronavirus."