Only 1249 dengue cases in Bengaluru since January. Really?

Every other person in Bengaluru complains of dengue. However the official dengue figure is projected at 1249 cases this year so far. What is the reality? An in-depth article.

Patients waiting for their turn at the outpatient department in K C General Hospital. Pic: Shree D N

What could be the number of people who suffered from dengue in Bengaluru? Out of 443 people who saw a quick survey conducted by Citizen Matters, 171 people replied positively about dengue cases. As many as 20 of them said they themselves got dengue since January 2015. This makes for a percentage of 4.5 cases of dengue on the readership of the survey.

If 4.5% of the population in Bengaluru suffered dengue, what could be the numbers? How many might have died?

Number of dengue cases reported in Bengaluru city limits: 1,249 – Health Department Website.

To understand the enormity of the issue, Citizen Matters hosted the online survey. Readers were asked to share information on whether they or a close family member had been affected by dengue. And the results we got corroborate the story of under-reporting of dengue cases.

One of our readers Joseph Dass, who had filled the form, said that his acquaintance Valeria, a resident of OMBR Layout near Banaswadi, died of dengue 10 days ago. She was admitted to Koshy’s Hospital when fever was high and she could not be saved, he said.

When Citizen Matters contacted Bannerghatta Road branch of Apollo hospital, we were told that over 1,000 confirmed dengue cases were reported in that hospital alone since January!

“We had at least 4,000 suspected dengue cases this year of which the disease was confirmed in over 1,000 cases. Of this at least 1/3rd of them were critical and were admitted to the hospital. We have been submitting dengue reports to the department regularly,” a doctor from the hospital adds.

Karnataka Health and Family Welfare Department’s website puts the number of dengue cases reported in Bengaluru city limits at 1,249, on September 29th 2015. This is the total number of confirmed dengue cases reported since January this year. According to this data, of the nine dengue deaths in Karnataka, none are from BBMP limits.

Though BBMP’s data says there are no deaths in Bengaluru, sources from Apollo hospital say there were four dengue deaths so far in that hospital alone. Then how many cases would have been reported from all private hospitals in Bengaluru? We don’t know, but it is clear that government data isn’t reflecting the reality. Where exactly is the problem?

Cost of various tests

NIV and NIMHANS – Free of cost for blood samples of patients admitted in government hospitals

NIV and NIMHANS – Rs 250 per test for blood samples from private hospitals

NIV and NIMHANS – Rs 500 package for conducting three tests – Elisa NS1, IgM and IgG

Rapid Card Test – On an average Rs 300 (charged by private hospitals)

Vector Borne Disease Programme State Deputy Director Dr B G Prakash said that the department has directed private hospitals to charge not more than Rs 250 for Elisa NS1 and IgM tests.

Treatment of dengue is free in government hospitals. In private hospitals the cost varies depending on the kind of treatment required.

This Indian Express news report mentions how a landmark 2014 study finds the real incidence could be 282 times the reported number per year. The study was conducted by the government’s own National Institute of Health and Family Welfare (NIHFW), New Delhi and found that India could have had over 57 lakh clinically diagnosed dengue cases during 2006-12.

Dengue numbers: claims v/s reality

Variation in dengue cases as reported by the Health Department and the private hospitals is not new. Every year, there lies a great disparity in the dengue statistics made public by the Health Department and the statistics available with private hospitals.

All these years, whenever the Health Department was criticised for under-reporting diseases, the officials used to point out at the private hospitals of not reporting cases with the Department. However, this year the Health Department is confident that most of the hospitals are submitting dengue reports and the department’s statistics are almost accurate.

In such a situation, why does the disparity in numbers continue to prevail? “That could be because the Department does not take our reports into consideration if blood samples are not tested by government specified laboratories,” says a doctor from a private hospital who does not want to be named.

‘No under-reporting’

Karnataka Health Minister U T Khader says there is no issue and denies any sort of underreporting.

“We have clearly told the government and private hospitals to follow the guidelines in conducting dengue tests and have asked them to submit us case reports on a regular basis. We have also directed them to follow uniformity in treatment. It is easy to make allegations about underreporting. Give us the evidence and we will take action,” he told Citizen Matters.

Dengue reporting – why is it not working?

This brings us to the core issue of confirmation tests for dengue. According to a government circular issued in 2010, the government and private hospitals can confirm dengue (DHF/DSS) through IgM Capture Elisa test. The circular says that rapid tests are not reliable in view of variable sensitivity and specificity.

In case of IgM Elisa, private institutions should send blood samples to referral laboratories if the test result is within 5 % positive or negative range for dengue, or if the test confirms dengue hemorrhagic fever (DHF) or dengue shock syndrome (DSS), which are serious cases of dengue. Referral laboratories in Bengaluru are National Institute of Virology field station at Victoria Hospital, Public Health Institute and NIMHANS.

“We had at least 4,000 suspected dengue cases this year of which the disease was confirmed in over 1,000 cases. Of this at least 1/3rd of them were critical and were admitted” – Apollo Hospital

Further, the circular says that the private hospitals can confirm a case of death due to dengue, only after referral laboratories confirm the blood samples.

But, this entire procedure is tiresome, according to hospitals. A doctor from a private hospital says that in their hospital they suggest Rapid Card test or NS1 Elisa test for patients who approach them within 4-5 days of having the disease symptoms. “If we are quite sure about the clinical sign and are in need of early detection, we advise Rapid Card test because here the test result is available in half an hour, whereas NS1 Elisa test result takes a day’s time. If the Rapid Card Test result is negative, we normally suggest the patient to undergo NS1 Elisa test for double verification,” he informs.

For patients who come to the doctors after five to seven days of onset of disease, the doctors suggest IgM Elisa test. “Rapid Card test is not reliable enough, but we believe that NS1 and IgM Elisa tests are quite accurate. Hence, we do not send blood samples to referral laboratories,” a doctor from a private hospital says.

On asked why they were not sending blood samples to referral labs, a source from a private hospital says that it is practically and logistically not possible. “Just imagine all the private hospitals sending blood samples of suspected cases to the NIV. Overload will result in backlog,” the source adds.

When this angle was pointed out to the Health Minister, he warned of issuing notices to those hospitals that fail to submit dengue case reports.

“No underreporting, Give us evidence and we will take action” – UT Khader, Health Minister.

Health dept doesn’t acknowledge private lab results

Since the hospitals do not send blood samples to referral laboratories, the Health Department does not acknowledge such cases despite them submitting dengue case reports. The Department takes into account only those cases that have been tested and confirmed by referral laboratories.

BBMP’s Chief Health Officer Dr Vatsala confirms that at present they consider only those cases confirmed by NIV. “Time and again we have been directing the private hospitals to send blood samples to NIV, but they do not do so. Majority of them conduct rapid diagnostic test where the accuracy level is low. There is no delay in getting test result from NIV. It can be obtained in 3-4 days,” she says.

Is dengue treated irrespective of NIV report?

The answer is, yes. Sources say that be it a private hospital or government hospital, practically patients and doctors cannot wait for 4-5 days for the arrival of test result from National Institute of Virology and then start the treatment, in case of dengue. This is because generally patients come to the hospitals after waiting for 4-5 days for the fever to go down. Waiting for NIV test report can be fatal for the patient.

Dr T Durganna, Medical Superintendent at Victoria Hospital, confirms this. He says that the doctors in Victoria hospital do not wait for the NIV report to begin the treatment. They start symptomatic treatment for the patients. However, they will initiate blood transfusion only after obtaining report from NIV.

“The issue could be fixed if the government identifies and accredits private laboratories and hospitals” – Dr Arvind Kasturi, St Johns Hospital.

Sources from K C General hospital, Malleshwaram, say that it takes seven days for NIV to send the reports. When there are holidays in between, the delay is more as it is a government entity. However, doctors here don’t wait for the report. They start the treatment as required, based on various in house tests including platelet count tests.

For this reason, the number of dengue cases could be much more than what is portrayed by the Department, for private doctors prefer to treat the disease first, than reporting it, as reporting it doesn’t serve any other purpose than figuring out the accurate number of affected patients.

In case of private hospitals, NS1 Elisa or IgM Elisa and platelet count tests are conducted in the labs of the hospitals and treatment is given accordingly. Same test is conducted in NIV too but the result is usually delayed.

What does the official data suggest?

Let us look at available dengue data. Following table is compiled from the statistics taken from National Vector-Borne Disease Control Programme and from KC General Hospital, Malleshwaram.

Dengue cases in BBMP limits (as on September 30th)

Blood samples sent to NIV – 1,775

Confirmed cases – 856


Total cases confirmed

Cases confirmed in KC General Hospital alone































The data suggests that half of the confirmed cases from across BBMP limits were from K C General Hospital alone. This is not likely to be the truth, as dengue has been seen across Bengaluru, with all hospitals treating it.

‘Accredit reliable private labs’

What’s the solution for this problem? The issue could be fixed if the government identifies and accredits private laboratories and hospitals that are capable of making efficient diagnosis on their own, opines Dr Arvind Kasthuri, Head of the Community Medicines Department at St John’s Hospital.

He strongly believes that several private hospitals and laboratories in the city are capable of performing diagnosis on their own at par with referral labs. The government should recognise such labs and take into account the dengue cases reported by them. This will also help private medical practitioners in treating patients. They can refer their patients to undergo blood test in accredited laboratories instead of sending them to hospitals.

“At present, most of the private hospitals do not send blood samples to referral labs to avoid the delay in procedure. Naturally, priority of hospitals is to cure patients, not to contribute to the literature of the Health Department. The only way forward to ensure actual dengue cases to reflect in the Department’s statistics, is to accredit private labs,” Dr Kasthuri says.

However Health Minister Khader disagrees with the need for additional accredited referral labs. “The existing laboratories are sufficient. There is no need for more labs,” he said.

Some questions on dengue status

  • Why doesn’t the state Health Department consider the data from private hospitals when it is the same test that is conducted in private hospitals? Why play the ringmaster when co-ordination can go a long way in combating a deadly disease?
  • Why can’t the government consider an accreditation system for labs from reputed private hospitals? Anyway private hospitals are playing a major role in healthcare sector in the state.
  • Databases in government hospitals are connected by National Informatics Commission system. Why can’t this be linked even to the private hospitals, for speedy process of data updation?
  • Has there anything been done to put a cap on the cost of dengue treatment by the private hospitals? These days even poor people prefer private hospitals as there are useful health cards and the treatment is quicker than government hospitals.

— With inputs from Shree D N

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