How has doubling rate of coronavirus cases in India slowed down after lockdown?

New delhi: The southern state of Kerala could probably become the first state in India to flatten the COVID-19 curve. It has bucked the national trend by delaying the doubling time of coronavirus cases — meaning the number of days it takes for the cases to double — to 72.2 days, against a national average of 7.5-8 days.      

"As of today, we have 437 cases and three deaths. Early tracking, screening, home quarantine, strict isolation and public participation are the core reasons for Kerala's success. Now, the test will be when the lockdown restrictions are lifted from May 3," Dr B Iqbal, chairman of the Kerala state expert committee on coronavirus, told on Thursday. 

Kerala's first COVID-19 case was of a medical student who arrived from the Chinese city of Wuhan on January 24 and was diagnosed six days later. It was the first coronavirus infection recorded in India and for several weeks, Kerala alarmingly topped the charts with more cases than elsewhere in the country.

"The state's healthcare system works like a well-oiled system from bottom to top. It is not the first time we are fighting a deadly epidemic. In 2018, the state had dealt with an outbreak of Nipah, a brain-damaging virus, where 17 people had died and we contained a potential disaster," K K Shailaja, the state health ministry told.

The central Indian state of Chhattisgarh has also been proactive in tackling the coronavirus problem, say observers. Authorities there are relying on an approach based on color-zoning districts into red, orange and green. Out of 28 districts in the state, 23 haven't reported a single coronavirus so far.

"We are having less number of cases and zero deaths. The key was that the state started preparations early and then luck also played its part," Health Minister T S Singh Deo told DW.

The number of cases in states like Kerala is far lower than that in the western state of Maharashtra, which has detected more than 6,400 infections until now. The city of Mumbai, Maharastra's state and India's financial capital, alone accounts for over 3,000 cases.

Over a third of all new cases recorded in India are in Maharashtra, the second-most populous state in the country. Meanwhile, states such as Gujarat and Delhi, which till a week ago had a little over 500 infections, now have over 2,300 cases each.

A drop in the rate of growth?

On Friday, India completes a month in nationwide lockdown. Over the past several weeks, Prime Minister Narendra Modi's government has been trying to curtail the transmission of the virus with a "cluster containment strategy." The aim is to contain the disease within a defined geographic area by early detection of cases, breaking the chain of transmission and thus preventing its spread.

The government initially imposed a 21-day lockdown — which was supposed to end on April 14 — but later extended it until May 3.

"Our doubling time of cases is increasing. The current situation indicates that a significant increase in the number of COVID-19 cases is unlikely," said Raman Gangakhedkar, the head of epidemiology and infectious diseases at the Indian Council of Medical Research (ICMR).

According to a study conducted by ICMR, in the absence of a lockdown and containment measures, there would have been over 820,000 cases in India by April 15. The projection, with containment measures but no lockdown, stood at 120,000 cases.

However, the actual number of recorded cases currently stands at over 23,500 cases. While over 700 have died from the disease, more than 5,000 have recovered. 

"There is a decrease in the rate of growth of infection in India and social distancing in India has been more effective than in many other countries," K Srinath Reddy of the Public Health Foundation of India told.