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New Delhi, Apr 24: The trajectory of COVID-19 cases could have plateaued and might even fall for some weeks after the lockdown is lifted but India is likely to see a second wave in late July or August with a surge in the number of cases during the monsoon, say scientists.

The timing of the peak will depend on how India is able to control physical distancing and on the level of infection spreads after restrictions are relaxed, they said.

It looks apparent that the trajectory of daily new cases has reached a plateau and eventually it will take a downward fall, maybe for some weeks or even months, Samit Bhattacharya, associate professor at the Department of Mathematics, Shiv Nadar University, said.

Still, we may get a surge of new cases of the same coronavirus and this will be considered a second wave, Bhattacharya explained.

The second epidemic may come back in late July or August in the monsoon, although the peak timing will depend on how we control social distancing during that time, he said.

Rajesh Sundaresan, professor at Bengaluru's Indian Institute of Science (IISc), agreed.

“Once we return to normal activity levels, there is a chance that infection may begin to rise again. China is seeing this to some extent post easing of some restrictions on travel,” Sundaresan, corresponding author of a working paper by researchers at IISc and the Tata Institute of Fundamental Research (TIFR) in Mumbai, said.

On March 25, when the number of coronavirus cases was 618 with 13 deaths, the government announced a nationwide lockdown that was later extended to May 3.

On Friday, the death toll due to COVID-19 rose to 718 and the number of cases to 23,077, according to the Union Health Ministry.

In good news, officials said this week that the doubling rate of cases has slowed down in the period, going from 3.4 days before lockdown to 7.5 days, with 18 states doing better than the national average. The recovery rate has also almost doubled in the last 10 days.

"Looking at the new cases in the past few days, it seems the growth of new daily infection is much slower than earlier. This apparently indicates that we might have reached at the plateau of the growth curve, Bhattacharya said.

He noted that recent studies in China and Europe observed that the infection might relapse in those people who have already recovered from earlier phases.

So, there is no evidence that the earlier infection may help acquire immunity against the second infection. And in that way, the entire population may be vulnerable to the second wave to some extent, said the scientist.

In their study unveiled this week, IISc and TIFR researchers analysed the impact of strategies such as case isolation, home quarantine, social distancing and various post-lockdown restrictions on COVID-19 that might remain in force for some time.

The study modelled on Bengaluru and Mumbai suggests the infection is likely to have a second wave and the public health threat will remain, unless steps are taken to aggressively trace, localise, isolate the cases, and prevent influx of new infections.

The new levels and the peaking times for healthcare demand depend on the levels of infection spreads in each city at the time of relaxation of restrictions, they said.

The lockdown is currently upon us. It has given us valuable time. Let us test, trace, quarantine, isolate, practice better hygiene, search for a vaccine, etc. We should do these anyway, and these are being done. When and how to lift the lockdown is going to be a difficult decision to make, said Sundaresan.

It's clear that it's going to be phased. What our team is focusing on is to come up with tools to help the decision makers assess the public health impact of various choices, he said.

According to the experts, infectious diseases spread via contact between infectious and susceptible people. In the absence of any control measures, an outbreak will grow as long as the average number of people infected by each infectious person is more than one.

Once enough people are immune there will be fewer people susceptible to the infection and the outbreak will die.

However, when an outbreak is brought under control by social distancing and other interventions, it is possible only a small proportion of the population will have been infected and gained immunity, they said.

This means enough susceptible people may remain to fuel a second wave if controls are relaxed and infection is reintroduced.

Until the vaccine comes on the market, we have to remain alert Once sporadic cases occur here and there in the country, we immediately need to implement quarantine or social distancing locally for the people in that region, and also need to perform tests to identify positive cases irrespective of showing symptoms, Bhattacharya explained.

Note that these monsoon months are also flu season in many places of India. So, we should not ignore the early signs of the flu symptoms. Irrespective of symptoms, we need to increase tests in the hotspots to identify people and contain the surge, he said.

Sundaresan added that the timeline for a second wave will depend on a lot of circumstances which may change as the time passes.

Significant testing may have been underway, there may be behavioural changes with people becoming more careful about their hygiene, wearing masks may become more common, etc. All these responses may help restrict the second wave, he said.

A study published in The Lancet journal earlier this month modelled the potential adverse consequences of premature relaxation of interventions, and found it might lead to a second wave of infections.

The finding is critical to governments globally, because it warns against premature relaxation of strict interventions, the researchers said.

While interventions to control the spread of SARS-CoV-2 are in place, countries will need to work toward returning to normalcy; thus, knowledge of the effect of each intervention is urgently required, they said in the study.

According to a recent analysis by the Harvard Chan School of Public Health, the best strategy to ease the critical care burden and loss of life from COVID-19 might be on-again, off-again social distancing.

In the absence of such interventions, surveillance and intermittent distancing may need to be maintained into 2022, which would present a substantial social and economic burden, the researchers wrote.p

New Delhi, Mar 19: Former Chief Justice of India Ranjan Gogoi took oath as Rajya Sabha MP on Thursday.

Gogoi's wife Rupanjali Gogoi, daughter, and son in law were also present in Parliament.

Congress staged a walkout from the Rajya Sabha over Gogoi's membership to the House.

Meanwhile, Union Minister Ravishankar Prasad welcomed Gogoi in the Rajya Sabha.

President Ram Nath Kovind had nominated the former CJI to the Rajya Sabha on March 16.

Gogoi served as the 46th Chief Justice of India from October 3, 2018, to November 17, 2019.

On November 9, 2019, a five-judge Bench headed by him had delivered the verdict in the long-pending Ramjanmabhoomi case.

New Delhi, Mar 9: Petrol and diesel prices registered a drop across the country on Monday as global oil prices plummeted around 30 per cent after Saudi Arabia slashed prices and set plans for a dramatic increase in crude production in April.

In New Delhi, petrol price fell by 24 paise intra-day and stood at Rs 70.59 per litre. Diesel in the national capital was retailed at Rs 63.26 per litre on Monday as against Rs 63.51 on Sunday.

The retail price of petrol in Kolkata saw a drop of 23 paise to Rs 73.28 per litre. The diesel price fell by 25 paise in the eastern metropolitan city to retail at Rs 65.59 per litre.

In Mumbai, petrol price was Rs 76.29 per litre as against Rs 76.53 a day earlier. Diesel was retailed at Rs 66.24 per litre, 26 paise lower than on Sunday.

In Chennai, petrol was retailed at Rs 73.33 per litre, 25 paise lower than a day earlier. Diesel price saw a fall of 26 paise to retail at Rs 66.75 per litre in the southern metropolitan.

Global crude oil prices fell by as much as a third following Saudi Arabia's move to start a price war with Russia amid worries over the spread of coronavirus.

Brent crude futures were down 13.29 dollars or 29 per cent at 31.98 dollars a barrel by 04:33 hrs GMT after earlier dropping to 31.02 dollars, their lowest since February 12, 2016.

Brent futures were on track for their biggest daily decline since January 17, 1991 at the start of the first Gulf War.