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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, May 12: With 3,604 more COVID-19 cases reported in the last 24 hours, India's tally of coronavirus cases reached 70,756, said the Union Ministry of Health and Family Welfare on Tuesday. 87 deaths were reported during the period.

As per the tally, 46,008 patients are active coronavirus cases while 22,454 patients have been cured/discharged and one patient has migrated.

With 87 deaths due to COVID-19 reported in the last 24 hours, the number of deaths has risen to 2,293.

As per the ministry, Maharashtra has the most number of coronavirus cases with 23,401 cases with 4,786 patients being cured/discharged while 868 deaths have been reported in the state.

Gujarat is second on the list with 8,541 cases that include 2,780 patients recovering from the disease and 513 fatalities.

Tamil Nadu's tally reached 8,002 cases, including 2,051 recoveries and 53 deaths.

While Delhi's tally stands at 7,233 cases with 2,129 patients recovered and 73 deaths.

Meanwhile; Mizoram (one case reported--now recovered), Goa (seven cases reported and all seven recovered), Manipur (Two cases reported and both patients recovered) and Arunachal Pradesh (one case reported--now recovered) have reported no new cases in the last 24 hours.

Panaji, Mar 26: Three persons, all with travel history abroad, tested positive for coronavirus in Goa on Wednesday, health department officials said, as the tourist haven joined the states which have reported COVID-19 cases.

This is the first time the tourist state has reported coronavirus positive cases.

The Directorate of Health Services, in a late night press statement here, said three suspected cases of COVID-19 from Goa, whose test results were awaited, have turned out positive.

All three are male patients of ages 25, 29 and 55 years. They have travel history of returning to Goa from Spain, Australia and the USA, respectively, the officials said.

The condition of the trio, admitted in Goa Medical College and Hospital near here, is stable, the officials added.

Chief Minister Pramod Sawant said the state is providing the best healthcare facility to the diagnosed patients.

I have been informed by the state Directorate of Health services that three individuals have been tested positive for #COVID19 in Goa.

"We are providing the best healthcare facility to the diagnosed patients, he said.

Their condition is stable at present. e have also traced their contacts and are quarantining them, Sawant added.

Health Minister Vishwajit Rane said the government is taking all precautions and following guidelines related to the viral infection.

In view of the three positive coronavirus cases in Goa, we are following all guidelines laid down by the central government and taking all precautions with the support of chief minister Pramod Sawant, he said.

Our testing facility will be up and running in the next two days. Our team of doctors is doing its est to make sure we contain the spread of virus in the state, Rane added.