Reduction in air pollution during lockdown in India may have prevented 630 premature deaths: Study

New Delhi, Fevb 10: Of the countries most at risk of importing coronavirus cases, India ranks 17th, researchers have found on the basis of a mathematical model for the expected global spread of the virus that originated in China's Wuhan area in December 2019.

So far, India has reported three coronavirus positive cases -- all from Kerala.

Among the airports in India, the Indira Gandhi International Airport in New Delhi is most at risk, followed by airports in Mumbai, Kolkata, Bengaluru, Chennai, Hyderabad and Kochi, according to the model.

The new model for predicting global novel coronavirus cases has been developed by researchers from Humboldt University and Robert Koch Institute in Germany.

"The spread of the virus on an international scale is dominated by air travel," said the study.

"Wuhan, the seventh largest city in China with 11 million residents, was the relevant major domestic air transportation hub with many connecting international flights before the city was effectively quarantined on January 23, 2020, and the Wuhan airport was closed. By then the virus had already spread to other Chinese provinces as well as other countries," it added.

The researchers said that it is possible to estimate how likely it is that the virus spreads to other areas by looking at air travel passenger numbers.

"The busier a flight route, the more probable it is that an infected passenger travels this route. Using these probabilistic concepts, we calculate the relative import risk to other airports. When calculating the import risk, we also take into account connecting flights and travel routes that involve multiple destinations," said the study.

The top 10 countries and regions at risk of importing coronavirus cases are: Thailand, Japan, South Korea, Hong Kong, Taiwan, USA, Vietnam, Malaysia, Singapore and Cambodia, according to the model.

While Thailand's national import risk is 2.1%, it is 0.2% for India, found the research.

The foundation of the model is the worldwide air transportation network (WAN) that connects approximately 4,000 airports with more than 25,000 direct connections.

The model accounts for both, the current distribution of confirmed cases in mainland China as well as airport closures that were implemented as a mitigation strategy.

This network theoretic model is based on the concept of effective distance and is an extension of a model introduced in the 2013 paper "The Hidden Geometry of Complex, Network-Driven Contagion Phenomena" published in the journal Science.

The current outbreak of the 2019-nCoV virus started in Wuhan city, Hubei province, China. While the first cases were reported as early as December 8, 2019, the outbreak gained global attention on December 31, 2019, when the World Health Organization was alerted to "several cases of pneumonia" by an unknown virus.

The new virus was soon identified as a novel coronavirus and named 2019-nCOV. It belongs to the family of viruses that include the common cold and viruses such as SARS and MERS. On January 20, 2020, it was confirmed that the coronavirus can be transmitted between humans, greatly increasing the risk of a global spread.

The death toll due to the novel coronavirus outbreak in China has increased to 811 on Sunday, surpassing that of the Severe Acute Respiratory Syndrome (SARS) epidemic in 2003.

Although about 20 countries have confirmed cases, China has accounted for about 99 per cent of those infected. The first foreign victims of the virus both died on Saturday in Wuhan.

The Ministry of Health and Family Welfare has prepared a draft for guidelines for home quarantine, as well as for the use of masks by public, in view of coronavirus.

What to do in Home Quarantine?

The government says, for those taking refuge to home quarantine should stay in a well-ventilated single-room preferably with an attached or separate toilet. It adds that if another family member needs to stay in the same room, it's advisable to maintain a distance of at least 1 metre between the two.

The government advised, coronavirus patients to stay away from elderly people, pregnant women, children and persons with co-morbidities within the household as their immune system may be low. The health minister also suggested to restrict the patient's movement within the house. "Under no circumstances attend any social/religious gathering e.g. wedding, condolences, etc, said the guideline.

It also instructed the corona virus infected person to avoid sharing household items like dishes, drinking glasses, cups, eating utensils, towels, bedding, or other items with others at home. The guideline also demanded that even though home quarantine, the patient should wear a surgical mask at all times. "The mask should be changed every 6-8 hours and disposed off. Disposable masks are never to be reused, it added.

"Masks used by patients/ caregivers/ close contacts during home care should be disinfected using ordinary bleach solution (5 per cent) or sodium hypochlorite solution (1%) and then disposed of either by burning or deep burial," instructs the government.

Even for family members of a patient, the health ministry clearly instructs to use disposable gloves when cleaning the surfaces or handling soiled linen. No visitors, under any circumstances will be allowed, said the guideline.

"In case the person being quarantined becomes symptomatic, all his close contacts will be home quarantined (for 14 days) and followed up for an additional 14 days or till the report of such case turns out negative on lab testing," states the draft.

How to wear & dump masks?

There is a specific and elaborate do's and don'ts also released by the ministry. For those unsure in which mask to choose, it says, "Medical masks of different sizes and shapes are available in the market. The common ones are flat pleated masks of woven fabric which covers the nose and mouth and affixed behind the head with straps/ elastic fasteners. There are also conical or duck bill shaped masks with valves (or without valves) that fit in the contour of face over the nose and mouth, but are costlier."

However, the ministry warns, medical masks should not be used by healthy persons who are not having any symptoms "because it creates a false sense of security". Instead, it suggests to refrain from touching face, mouth, nose and eyes as well as washing hands regularly with soap for 20 seconds each time.

However, when a person develops a cough or fever, the suspected patient needs to switch to medical masks. "Use of medical three layer masks when ill, will prevent your infection from spreading to others. However you also need to wash your hands frequently to avoid spreading infection to others," read the guideline.

Even if one is not tested positive but showing symptoms, they are advised to wear masks while visiting a healthcare facility. "Close family contacts of such suspect/confirmed cases undergoing home care should also use Triple layer medical mask," it warns.

The ministry has also given point by point guideline on how to use a mask like to make sure that they are facing down while unfolding or for that matter to ensure there are no gaps on either side of the mask.

It even warns, "Fit flexible nose piece (a metallic strip that can easily be located) over nose-bridge" to ensure no one else are infected. The government also warns against simple dumping of the masks once used. Instead one should disinfect "using ordinary bleach solution (5 per cent) or sodium hypochlorite solution (1 per cent) and then disposed of either by burning or deep burial," says the Health Ministry.

COVID-19 emerged in early December 2019 in China's Wuhan province and has now spread to over 100 countries. As on March 9, 2020, India has reported 42 cases mostly among those who had travelled from affected countries.

However the government says, "It causes a minor illness in majority of patients with symptoms of fever and or cough. A small proportion of such persons may progress to severe disease with difficulty in breathing."

Ahmedabad, Mar 24: The Gujarat police has detained 426 people in the last 24 hours for violating lockdown rules in force in the state to combat the novel coronavirus outbreak, a senior official said on Tuesday.

They include those who came out despite being advised home quarantine, state Director General of Police Shivanand Jha said.

"The lockdown met with around 90 per cent success. We are taking strict measures to implement the lockdown in the remaining 10-15 per cent areas. We have lodged 238 cases related to the violation of police notification and 127 cases related to quarantine rule violation. In all, we have detained 426 persons across the state," Jha told reporters in Gandhinagar.

"For better implementation of the lockdown and to address issues concerning people, we have set up a dedicated 24-hour control room and appointed two additional DGP rank officers to supervise operations. Three teams under them would work to resolve issues across the state," said Jha.

He said police commissioners and districts SPs have been asked to enforce the lockdown in an effective manner.

Essential services like vegetable and milk shops are allowed to remain open, he said, and asked people not to flock in large numbers to such shops.

The state has so far reported 33 COVID-19 cases, and one person has died of the infection.