Coronavirus can go up to 8 metres from exhalation, linger in air for hours: MIT scientist

News Network
April 2, 2020

The current physical distancing guidelines provided by the World Health Organisation (WHO) and by the US Centers for Disease Control and Prevention (CDC) may not be adequate to curb the coronavirus spread, according to a research which says the gas cloud from a cough or sneeze may help virus particles travel up to 8 metres. The research, published in the Journal of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.

Study author, MIT associate professor Lydia Bourouiba, warned that droplets of all sizes can travel 23 to 27 feet, or 7-8 metres, carrying the pathogen.

According to Bourouiba, the current guidelines are based on "arbitrary" assumptions of droplet size, "overly simplified", and "may limit the effectiveness of the proposed interventions" against the deadly pandemic.

 She explained that the old guidelines assume droplets to be one of two categories, small or large, taking short-range semi-ballistic trajectories when a person exhales, coughs, or sneezes.

However based on more recent discoveries, the MIT scientist said, sneezes and coughs are made of a puff cloud that carries ambient air, transporting within it clusters of droplets of a wide range of sizes.

Bourouiba warned that this puff cloud, with ambient air entrapped in it, can offer the droplets moisture and warmth that can prevent it from evaporation in the outer environment.

"The locally moist and warm atmosphere within the turbulent gas cloud allows the contained droplets to evade evaporation for much longer than occurs with isolated droplets," she said.

"Under these conditions, the lifetime of a droplet could be considerably extended by a factor of up to 1000, from a fraction of a second to minutes," the researcher explained in the study.

The MIT scientist, who has researched the dynamics of coughs and sneezes for years, added that these droplets settle along the trajectory of a cough or sneeze contaminating surfaces, with their residues staying suspended in the air for hours.

"Even when maximum containment policies were enforced, the rapid international spread of COVID-19 suggests that using arbitrary droplet size cutoffs may not accurately reflect what actually occurs with respiratory emissions, possibly contributing to the ineffectiveness of some procedures used to limit the spread of respiratory disease," Bourouiba wrote in the study

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News Network
April 24,2024

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With the Karnataka transport department extending the deadline for the installation of High Security Registration Plate (HSRP) twice--- in November last year and February, it is no longer planning to extend the same. The department ordered for the installation of HSRP before May 31.

The transport department through a notification in August last year, had mandated the installation on all the vehicles that were registered in the state prior to April 1, 2019. According to transport officials, there are nearly two crore vehicles that are supposed to get HSRP for their vehicles.

“As of now, the state has registered only 34 lakh HSRP installations, despite extending the deadline twice. From nearly 18 lakh installations since February, the numbers have almost doubled. However, there are still a large number of vehicles that have to opt for HSRP,” said C Mallikarjuna, Additional Commissioner for Transport (Enforcement).

“We will wait till May 31 to check for the total number of vehicles that fall in line. We are expecting HSRP installations to touch 75 lakh, after which we will consider an extension as the numbers indicate that people are falling in line and if some more time is given everyone will get it done. However, if we do not reach that number before the deadline, we will request the government not to extend the deadline but urge for an enforcement,” he said.

He also stated that a fine of Rs 500 will be imposed for the first time and if vehicle owners do not fall in line, it will be Rs 1,000 later until they have installed HSRP. “We will wait till the Model Code of Conduct ends and take the government’s opinion. We are going to request the government for strict enforcement if the HSRP installations are not satisfactory,” he added.

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News Network
April 25,2024

Bengaluru: Karnataka State Natural Disaster Monitoring Centre (KSNDMC) has issued a series of animated shorts in Kannada advising people of appropriate measures to take during extreme temperatures to keep oneself safe.

 “Karnataka has not seen such extreme temperatures and heat waves in the recent past. So, we wanted to ensure a wider reach for safety measures, therefore we decided to issue them in a reader-friendly format,” said an official from KSNDMC.

Meteorological Centre Bengaluru, Indian Meteorological Department, had issued a five-day heat wave warning, lasting till April orange alert, for parts of Karnataka.

“In places like Bagalkote, Vijayapura, Kalaburgi, Yadgir, Raichur, Koppal, Ballari, Tumkur, Mandya, Gadag, Davangere and Chitradurga, the temperature is likely to touch 40 degrees Celsius tomorrow,” said C P Patil, director of the centre.

On April 25, these places recorded a maximum temperature of 39 degrees Celsius.

Orange alert would mean increased likelihood of heat illness symptoms in people who are exposed to sun for a prolonged period of time as well as those who do heavy manual work.

According to Patil, coastal Karnataka will also have very hot and humid weather conditions, making it very uncomfortable for people there.

“It’s best for children and old people to avoid exposure to heat in coastal areas too,” added Patil.

In places where heat wave is predicted, people are advised to avoid direct exposure to sunlight between 12 noon and 3pm.

“When they go out, it is best to use protective goggles, an umbrella or a hat. Also aerated drinks must be avoided since they cause dehydration. Best to drink water as much as possible, even if you don’t feel thirsty,” said M Rajavel, head of LACD, Meteorological Centre, Bengaluru.

People are also advised not to leave the children or pets inside parked vehicles.

The maximum and minimum temperatures of Bengaluru are very likely to be around 37 degree Celsius and 23 degree Celsius respectively for the next 48 hours, said Patil.

Hassan recorded the highest jump from its normal minimum temperature. It recorded 22.6 degrees Celsius, about 2.8 degrees more than usual.

According to IMD, on April 29 light rain is also very likely in isolated places over Bidar, Kalaburgi, Yadgir, Vijayapura, Chikkamagaluru, Hassan, Kodagu, Mysuru, Mandya and Chitradurga districts.

On April 30, light rain is predicted again for Bidar, Kalaburgi, Yadgir, Vijayapura, Raichur, Koppal, Ballari, Chikkamagaluru, Tumkur, Chikkaballapura, Bengaluru Rural, Bengaluru Urban and Kodagu districts.

Incidentally, KSNDMC has also issued a series of animated advisory for lightning safety.

“We also update temperature every 15 minutes in our X handle in coordination with IMD,” added the KSNDMC official.

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News Network
April 12,2024

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Udupi, Apr 12: A family’s visit to a resort to enjoy Eid-ul-Fitr holidays turned tragic as a 10-year-old boy drowned in the swimming pool at Hengavalli in Kundapur taluk of Udupi district on Thursday. 

The deceased has been identified as Mohammed Azeez, a Class 4 student at Darussalam English Medium School in Hoode.

Azeez was, who had gone to the resort along with his parents, was playing in the pool when he lost balance and drowned. Even though he was rescued, he was in a critical condition and later breathed his last. 

The family members have accused the negligence of the resort management as the reason for Azeez's death. They said that the incident occurred due to the absence of safety equipment like life jackets and the lack of lifeguards near the swimming pool.

A case has been registered at Shankaranarayana police station and investigations are underway. 

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