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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

Jun 13: The Congress on Saturday accused the BJP-led government of burdening the common man with high taxes on petrol and diesel and earning Rs 2.5 lakh crore since March 5.

Congress leader Kapil Sibal said while international crude oil prices have fallen and are at the lowest level in 15 years, yet petrol and diesel prices are skyrocketing and common people continue to suffer under the Modi dispensation.

He said instead of passing the benefit of lower crude prices to consumers, petrol and diesel prices were hiked for the seventh straight day on June 13.

"The government has earned as much as Rs 44,000 crore in the last six days due to hike in petrol, diesel prices. Since March 5, the government has earned as much as Rs 2.5 lakh crore by way of increasing petrol, diesel prices.

"If the government had even the slightest feelings for the common man, instead of benefitting the companies and the government, the prime minister would have helped the common man with reduced fuel prices," Sibal said at an online press conference.

According to a report by Care Ratings, he said the hike effectively meant that the Central government is collecting around 270 per cent taxes on the base price of petrol and 256 per cent in case of diesel.

The former union minister said petrol was selling at Rs 71.41 in Delhi on May 1, 2014, when international crude oil prices were USD 106.85, while on June 12, 2020, the price of petrol was Rs 75.16 when the crude oil was at USD 38.

He said central excise and VAT cumulatively account for 69 per cent of tax on fuel in India which is higher than anywhere else in the world. He said the tax of fuel in the US was 19 per cent, Japan 47 per cent, the UK 62 per cent, France 63 per cent and Germany 65 per cent.

Jun 5: Underworld don Dawood Ibrahim and his wife Mahzabeen have tested positive for COVID-19, a top government source told CNN News 18. They were admitted to the Army Hospital in Karachi.

Some of Dawood's personal staff and guards have also been quarantined, the report said on Friday.

Dawood was the mastermind of the 1993 Mumbai blasts and is one of the most-wanted gangsters by India. He has allegedly been living in Pakistan but the neighbouring country has always refusing to accept it.

Earlier in the day, a senior diplomat of the American embassy in Pakistan has tested positive for the novel coronavirus, a media report said.

In a statement, the embassy's spokesman said that while maintaining the privacy, the name of the citizen would not be disclosed.

The US State Department is responsible to protect its citizens, wherever they are, the spokesman added. In coordination with the Pakistani authorities, the consulate is working to enforce the coronavirus protocol in order to stem its spread. The spokesman added that isolation wards, contact tracing and quarantine facility are part of such protocols.

Meanwhile, Pakistan has 89,249 COVID-19 cases and the death toll is 1,838.