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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

Mumbai, Apr 4: As many as six Central Industrial Security Force (CISF) personnel stationed at Mumbai airport in Maharashtra have tested positive for coronavirus, taking the total number of positive cases among the central force to 11. The first case of a CISF jawan being diagnosed with the viral disease was reported on March 28. 

After the first case, the armed police force reported four more cases of COVID-19 among the personnel stationed at the airport on Thursday. On the same day, the CISF collected samples of 146 staff and sent them to Kasturba hospital for testing. The results, which arrived on Friday, recorded six more COVID-19 cases among, reported news agency.

The personnel were posted at Kharghar adjoining Mumbai, a senior official told news agency.

As of now, there are 14 COVID-19 cases in Panvel Municipal Corporation (PMC) area in Mumbai. Kharghar comes under the civic body's jurisdiction.

All the 146 CISF personnel were shifted to a quarantine centre at a facility at Kamothe reported the Times of India.

Maharashtra reported 67 new COVID-19 cases, taking the total tally to 490. A total of 26 deaths have been reported in the state.  

In the meantime, the Centre on Friday said there is no shortage of medical supplies across the country to fight COVID-19 outbreak.

"The government of India is making sure that all the essential medical supplies are in place to fight COVID-19. Sixty-two lifeline Udan flights transported over 15.4 tons of essential medical supplies in the last five days," Union Minister for Chemical and Fertilisers DV Sadanada Gowda said in a tweet.

The government is also paying full attention to the manufacturing activities of essential items like pharmaceuticals and hospital devices. For this, over 200 units in Special Economic Zones (SEZs)  are operational, he added.

"A Central Control Room has also been set up for close monitoring of the distribution of essential medical items and to address logistic related issues," Gowda said.

New Delhi, Jun 24: A litre of diesel on Wednesday was more expensive than a litre of petrol after the price of the former was hiked by 48 paise on the 18th successive day of fuel price revisions. While petrol price remained unchanged for the first time since June 7, diesel prices maintained upward trajectory to touch new highs.

It is for the first time in Delhi that diesel has become more expensive than petrol. A litre of the fuel now costs ₹79.88 as against ₹79.76 for a litre of petrol, as per a report in news agency ANI.

While surging fuel prices may generate much-needed revenue for governments, it would also have a detrimental impact on household budgets. The spike in diesel prices also has a wider impact on the transport and agricultural sectors which are largely dependent on the fuel.

The widest gap between the prices of the two fuels was on June 18 of 2012 when a litre of petrol was at ₹71.16 in Delhi while diesel was at ₹40.91. On June 28, the gap between the two fuels was 31.17 per litre in Mumbai. Around that time, there was a spurt in sales of diesel passenger vehicles while demand for such vehicles has come down significantly in current times. This has also led many manufacturers to ditch diesel engines completely.

The current trend of fuel price hikes are unlikely to do demand for petrol vehicles much good either.

Daily price revisions of the two fuel had been temporarily halted for 83 days till it was resumed on June 7.

India's demand for fuel doubled in May and has been steadily rising in June with the easing of restrictions. Indian refineries have already scaled up crude processing with Indian Oil Corp, the country's top refiner, looking to operate its plants at about 90% capacity in June.

The rising fuel prices, however, have resulted in political uproar with Congress leading the charge against the central government and accusing it of penalising consumers by imposing high taxes. A demand for including fuel prices under Goods and Services Tax (GST) has also been renewed by many but it is highly unlikely that it would happen. With oil companies looking to cut back on their previous loses and governments - central as well as states - aiming to generate revenue after tumultous weeks of lockdown, fuel price hikes are likely to stay till at least the end of June.