Health

Coronavirus | ‘Several factors could be behind the low case fatality rate in India’

A girl with a protective mask.

A girl with a protective mask.

The case fatality rate (CFR) in India, which has been falling steadily, has for the first time dipped below the 2.5% mark to reach 2.49%. It was 3.2% in the second week of May. One of the reasons for the dip in case fatality rate could be ascribed to the increased number of fresh cases detected daily. On Sunday, over 40,000 fresh cases were reported, the highest reported for a single day and surpassing the earlier highest record of 35,468 on July 16.

As on July 20, the world average case fatality rate is around 4.2%, and the U.K. has the highest at about 15.4%, closely followed by Italy at 14.4%.

Explaining what could be the main reasons for the low case fatality rate in India, virologist Dr. Shahid Jameel, CEO of the Wellcome Trust/DBT India Alliance, in an email tells The Hindu : “Assuming the data is correct (and I have little reason to doubt it), there could be biological reasons for it. Young population (75% below 45 years), exposure to other infections making innate immunity stronger and genetic background [could be some of the reasons]. This is also the case for all countries in South Asia, Southeast Asia and parts of Africa, as well. The difference to a Caucasian population is rather stark.”

While it is true that the median age is 26.8 years in India and so a vast majority of India’s population is relatively young, in 2011, 8.6% (104 million) were above 60 years of age, thus increasing the chances of altering the case fatality rate during the course of the pandemic. Also, it is well-known that a large number of Indians in their 30s and 40s have at least one risk factor such as hypertension, diabetes, cardiovascular diseases, which could increase the chances of death from COVID-19. “This is an enigma. But I believe those co-morbidities become important when one develops severe disease and pneumonia. If most people in India are able to restrict the infection early, co-morbidities will have a much smaller role,” Dr. Jameel says.

Delhi and Gujarat were found to be under-reporting COVID-19 deaths, and lack of good tracking and recording of COVID-19 deaths, particularly when deaths do not occur in hospitals, could alter the low case fatality rate seen in India. While concurring that deaths outside hospitals are hard to track and account for, Dr. Jameel dismisses the possibility of under-reporting of deaths playing a significant role in reducing the case fatality rate. He says: “Death is also hard to miss. I believe there may be some under-counting but not a whole lot. The low CFR is not due to this. It will become harder in small towns and villages. The virus must already be there. It’s just that we don’t know too much on account of poor testing and poorer tracing. This is something to watch.”

Another factor suggested as an explanation for the low case fatality rate in India is the possibility that despite the number of cases detected crossing one million, India may still be in the late early stage of the pandemic as new cases are mainly reported only from large cities and towns. “I don’t think so [that India is in late early stage of the pandemic]. We know very little about how much the infection has moved into small towns and villages due to low or no testing in those areas. There is increasing evidence of [the virus] moving to next tier cities like Thane, Raigad and Pune in Maharashtra. The same biological principles would apply to small towns and villages as to large cities. The population genetics and exposure to infectious disease is similar — the latter possibly more in smaller places,” he says.

State of preparedness

One more factor that could sharply alter case fatality rate is the state of preparedness and enhanced capacity to handle cases when they suddenly surge. This was seen in Mumbai, Bengaluru and Delhi, where well-equipped hospitals were stretched beyond their capacities to handle the surge. While Delhi has in the last few weeks increased the bed capacity thus easing the pressure on hospitals now, Mumbai and Bengaluru still seem to be struggling. “Mumbai is still struggling and Bengaluru suddenly exploded after doing well early on. We are not out of the woods yet. [We] must reduce active cases; over 4% growth is too much,” Dr. Jameel says.

The health-seeking behaviour of people could also play a pivotal role in altering the case fatality rate. The delay in getting tested even when overt symptoms are present and delay in hospitalisation have led to many people dying within hours of hospital admission. It has been generally seen that people in some States, particularly in the southern States, seek medical intervention quite early during any disease. Besides the good quality of care, the early health-seeking behaviour has been particularly good in Kerala, which has so far reported only 43 deaths and has a case fatality rate of just 0.34% compared with 4.4% in Gujarat, which is the highest in India.

‘Kerala is different’

“Kerala is different from other southern States. It has a good healthcare system down to the PHC (Primary Health Care) level. It learned from the 2018 Nipah outbreak and kept the preparedness high. It also built trust and did aggressive contact tracing. Other southern States did none of this. Tamil Nadu has already been badly affected. Telangana, Andhra Pradesh and Karnataka are beginning to look quite bad,” he explains.

One more factor is the state of preparedness and enhanced capacity to handle cases when they suddenly surge. This was seen in Mumbai, Bengaluru and Delhi, where well-equipped hospitals were stretched beyond their capacities.

The health-seeking behaviour of people could also play a pivotal role. It has been generally seen that people in some States, particularly in the southern States, seek medical intervention quite early during any disease. Besides the good quality of care, the early health-seeking behaviour has been particularly good in Kerala, which has so far reported only 43 deaths and has a case fatality rate of just 0.34% compared with 4.4% in Gujarat, the highest in India.


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Printable version | Jul 2, 2022 5:39:09 am | https://www.thehindu.com/sci-tech/health/coronavirus-several-factors-could-be-behind-the-low-case-fatality-rate-in-india/article32142605.ece