S Korean First Lady celebrates Diwali in Ayodhya

New Delhi, April 5: The number of coronavirus cases in India has surged past 3500 with 505 new cases in the last 24 hours from across the country.

According to the Union Ministry of Health and Family Welfare, the total number of COVID-19 positive cases in the country has gone up to 3,577 as on Sunday. So far, 83 people have died of the coronavirus.

Among States, the tally in Maharashtra stood at 690. According to Maharashtra Health Minister Rajesh Tope, till now Mumbai has reported 29 positive cases, Pune 17, PCMC 4, Ahmednagar 3, Aurangabad 2 among others.

Here are the top developments of the day related to the pandemic.

1) Four new COVID-19 positive cases reported in Uttarakhand today, taking the total number of positive cases in the State to 26. Four persons have been treated and discharged till date, according to the Directorate of Health Services, Uttarakhand.

2) Prime Minister Narendra Modi today called up two former Presidents -- Pranab Mukherjee and Pratibha Patil and had a discussion on COVID-19 related issues. He also called up two former Prime Ministers -- Manmohan Singh and HD Deve Gowda -- to discuss COVID-19 situation.

3) The Prime Minister also called up leaders of various political parties like Sonia Gandhi, Mulayam Singh Yadav, Akhilesh Yadav, Mamata Banerjee, Naveen Patnaik, K Chandrashekar Rao, MK Stalin, Parkash Singh Badal and Mayawati.

4) Total coronavirus positive cases rose to 68 in Punjab after three more cases were reported today --- one each in Ludhiana, SAS Nagar and Barnala. The person found positive in Ludhiana had attended the Tablighi Jamaat event in Delhi.

5) No evidence of COVID-19 being airborne yet, according to the Indian Council of Medical Research (ICMR).

7) With 14 new cases in Kashmir division, the total number of positive cases in Jammu and Kashmir now at 106. Active cases in Kashmir -- 82 and Jammu -- 18, said Rohit Kansal, Principal Secretary, Planning, UT of Jammu and Kashmir.

8) "There is an insufficiency of Personal Protective Equipment (PPE) kits and N95 masks. We are in touch with the Centre and other agencies for supply. Receiving 15,000 PPE kits today. Requested Centre for 5 lakh PPE kits received 4,000 only," said Bihar's Principal Secretary, Health, Sanjay Kumar.

9) The total number of positive cases in Indore, Madhya Pradesh, till now is 122 after 9 more positive cases were found today, according to Indore Chief Medical and Health Officer Dr Praveen Jadia.

10) Union Health Minister Dr Harsh Vardhan visits AIIMS dedicated centre for COVID19 in Jhajjar, Haryana. He said: "All 162 patients admitted here are in stable condition."

11) 86 COVID-19 positive cases reported in Tamil Nadu today out of which 85 had attended the Tableeghi Jamaat event at Markaz Nizamuddin, Delhi, according to Beela Rajesh Tamil Nadu Health Secretary. There are 571 COVID positive cases in Tamil Nadu out of which 522 cases are from the people who had attended the religious function in Delhi, she said.

12) The Congress party on Sunday posed nine questions to the Centre, demanding compensation to the family of those, who died after battling with the coronavirus.

13) 47 new coronavirus positive cases reported in Rajasthan today, taking the total number of positive cases in the state to 253.

14) 8 new COVID-19 cases reported in Kerala, which include 6 imports and 2 contact cases, said Chief Minister Pinarayi Vijayan.

15) "PPE kits are imported. So there was a shortage initially in the country but the government started taking action in this regard from January. Domestic manufacturers have started production. We have also started procuring PPE kits from other countries," said Lav Aggarwal, Joint Secy, Health Ministry. 

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