Features
The Silent Shadow: The threat of the Nipah virus in Asia
In the quiet woods of West Bengal and the lush countryside of Kerala, a lethal pathogen is once again testing the limits of modern biosafety. The Nipah virus (NiV), a shadow that has flickered across South and South-East Asia for decades, is currently the subject of heightened international surveillance. With a case fatality rate that can soar up to 75%, this virus Nipah is not just a regional concern; it is a priority pathogen on the World Health Organization (WHO) Research and Development Blueprint, alongside Ebola and COVID-19, due to its epidemic potential.
To understand the much-justified fear Nipah inspires in the scientific community, one needs to look at its molecular machinery. Nipah is a negative-sense, single-stranded RNA virus belonging to the genus Henipavirus. In a kind of “Instruction Manual” analogy, Positive-Sense (+RNA) arrive with an instruction manual already written in the cell’s language. As soon as they enter the cell, the cell can start reading the RNA and “printing” viral proteins immediately. In contrast, Negative-Sense (-RNA) viruses like Nipah, Influenza, or Rabies, arrive with an instruction manual that is written backwards or as a “mirror image.” The cell’s machinery cannot read it directly. It cannot dictate terms to the cell. It needs a “translator” to get the cell to do what the virus wants. If the translator is deactivated, the virus becomes inert. However, with the help of the active translator, a replication pathway is created. This specific replication pathway is a major area of study for antiviral drugs. If we can find a way to “jam” that specific viral translator without hurting the host cell’s own functions, we can effectively stop the virus, so to speak, in its tracks.
Nipah is a “Biosafety Level 4” agent; the highest risk category requiring maximum containment. The virus targets the host’s cells lining of blood vessels and the nerve tissues. Once it enters the human body, typically through the binding of its attaching glycoprotein to host receptors, it initiates a devastating cascade. The infection often presents as a dual-threat, namely acute respiratory problems with features of severe “atypical pneumonia,” and potentially fatal involvement of the brain. In its most sinister form, the virus crosses the blood-brain barrier which routinely protects against invasion of the central nervous system by infective organisms, causing massive inflammation of the brain. Symptoms progress rapidly from fever and headache to drowsiness, disorientation, and seizures, often culminating in a coma within 24 to 48 hours.
As of January 2026, the epidemiological map of Asia shows several distinct hotspots. India is currently managing two distinct geographical risks. In West Bengal, a recent cluster in Kolkata and Barasat involving healthcare workers has triggered a massive “trace and test” operation. This region, bordering Bangladesh, has a history of outbreaks dating back to 2001. Simultaneously, Kerala in Southern India has become a recurrent epicentre, with four confirmed cases and two deaths reported in mid-2025 across the Malappuram and Palakkad districts.
Bangladesh remains the most consistently affected nation. In 2025 alone, four fatal, unrelated cases were reported across the Barisal, Dhaka, and Rajshahi divisions. Unlike the hospital-based transmission often seen elsewhere, Bangladesh’s outbreaks are frequently linked to a cultural staple, which is the consumption of raw date palm sap.
The current clusters have sent warning currents across the continent. Airports in Thailand (Suvarnabhumi and Phuket), Nepal, and Singapore have reinstated COVID-style health screenings for travellers arriving from affected Indian states. Taiwan has gone a step further, proposing to categorise Nipah as a “Category 5” notifiable disease; the highest level of public health alert.
The natural reservoir of Nipah is the Pteropus genus of fruit bats, commonly known as flying foxes. These bats carry the virus without falling ill themselves, shedding it in their saliva, urine, and excrement. The “spillover” to humans typically occurs via three routes:
= Contaminated Food: Eating fruit partially consumed by bats or drinking raw date palm sap where bats have urinated into the collection pots.
= Intermediate Hosts: In the 1998 Malaysia outbreak, pigs acted as “amplifying hosts” after eating contaminated fruit, later passing the virus to farmworkers.
= Human-to-Human: This is the greatest concern for urban centres. Close contact with the bodily fluids or respiratory droplets of an infected patient, often enough in a home care or hospital setting, can trigger secondary clusters.
While Sri Lanka has not yet recorded a human case of Nipah, the island cannot afford complacency. The risks are grounded in both biology and regional connectivity. Surveillance studies have confirmed that Pteropus bat species are indigenous to Sri Lanka. While the presence of the bat does not guarantee the presence of the virus, the ecological apparatus for a spillover event exists on the island. Environmental changes, such as deforestation, can drive these bats closer to human settlements in search of food, increasing the probability of contact.
Sri Lanka’s proximity to South India, particularly Kerala and Tamil Nadu, creates a constant flow of people and goods. With direct flights and maritime links to regions currently monitoring outbreaks, the risk of an “imported case” is quite considerable. A single undetected traveller in the incubation period, that is the period between the infection and production of the disease, which can last from 4 to 14 days, and in rare cases up to 45, could theoretically introduce the virus into a local clinical setting.
The primary challenge for Sri Lanka lies in looking at what doctors call a “differential diagnosis”, which looks at all possible conditions that have a similar clinical presentation. Early symptoms of Nipah mimic common tropical illnesses like dengue, Japanese encephalitis, or even severe influenza. Without high-level biocontainment labs (BSL-3 or BSL-4) and rapid Polymerase Chain Reaction (PCR) testing protocols specifically tuned for Henipaviruses, a localised outbreak could gain significant momentum before it is correctly identified. Incidentally, PCR is a sort of molecular photocopier which allows scientists to take a tiny, almost undetectable amount of viral genetic material (RNA or DNA) from a patient’s swab or blood sample and amplify it millions of times until there is enough to be detected and identified.
Currently, there is no licensed vaccine or specific antiviral drug in the treatment for Nipah. Management is limited to intensive supportive care. However, the “One Health” approach offers a roadmap for prevention:
=For the Public: Ensure all fruits are thoroughly washed and peeled, and discard any fruit that shows signs of bird or animal bites (“bat-bitten” fruit).
=For Healthcare Workers: Strict adherence to Infection Prevention and Control (IPC) measures. Wearing personal protective equipment (PPE) when treating patients with unexplained encephalitis or respiratory distress is vital.
=For Authorities: Strengthening surveillance of bat populations and enhancing the diagnostic capacity of national laboratories.
Nipah virus is a reminder of the permeable borders between the wild and the urban. As Asia watches the current clusters in India and Bangladesh, the lesson for Sri Lanka is clear: preparedness is the only antidote to a virus that currently has no cure.
We need to make the general public well aware of preventive guidelines for travellers to other countries, most particularly for those traveling to or from Kerala, West Bengal, or Bangladesh. Before travel, it is necessary to monitor the Sri Lankan Ministry of Health (Epidemiology Unit) website for travel advisories. Currently, screening is focused on passengers arriving from Kolkata and Kerala. It is essential to ensure that travel insurance covers medical evacuation and high-intensity supportive care, as Nipah management requires ICU facilities.
During the stay in an area of another country that is a high-risk area, avoid “Bat-Bitten” Fruit and do not purchase or consume fruit that has visible puncture marks, scratches, or missing chunks. In regions where fruit bats (Pteropus) are active, they often taste fruit and discard it, leaving saliva and virus behind. It is essential to only eat fruit that you have washed thoroughly with clean water and peeled yourself. Avoid pre-sliced fruit platters in street markets. Stay away from pig farms and bat roosting sites such as large trees where “flying foxes” gather. If you visit rural areas, do not touch surfaces under these trees which may be contaminated with bat urine.
Once a traveller returns to Sri Lanka, the authorities at the ports of entry have to be most vigilant. As for the traveller, it is best to self-monitor for about a month. The incubation period can be long. If you develop a fever, severe headache, or cough within three weeks of returning, isolate yourself immediately. If you seek medical care, the very first thing you should tell the doctor is: “I have recently returned from a region where Nipah cases were reported.”
Healthcare workers have to be extremely careful. This is crucial for doctors and nurses in Sri Lankan Outpatient Departments (OPD) and Emergency Treatment Units (ETUs). Careful medical triage of sorting out possible cases is mandatory. It is necessary to maintain a High Index of Suspicion: In any patient presenting with Acute Respiratory Distress Syndrome (ARDS) or Encephalitis (confusion, seizures, or coma), immediately check their travel history or contact with travellers. It is essential that the health staff do not rule out Nipah just because a patient has a “simple” cough or a “sore throat” as these often precede the neurological crash by 24–48 hours.
Infection Prevention and Control (IPC) measures have to be employed compulsorily. Because Nipah has a high rate of nosocomial (hospital-acquired) spread, the following “Standard Plus” precautions are mandatory for suspected cases:-
=Meticulous hand hygiene before and after patient contact.
=Use of medical masks and eye protection (goggles or face shields).
=Double gloving and the use of fluid-resistant gowns.
If a patient is suspected to suffer from Nipah virus infection, the patient needs to be moved to a dedicated isolation ward immediately. Do not “cohort” (group) them with other encephalitis or flu patients until Nipah is ruled out by PCR. Treat all bodily fluids (blood, urine, saliva) as highly infectious biohazards. Use 0.5% sodium hypochlorite for surface disinfection. Under the Infectious Diseases Act, Nipah is a notifiable disease in Sri Lanka. Contact the regional Medical Officer of Health (MOH) or the Epidemiology Unit immediately upon suspicion. DO NOT WAIT FOR LAB CONFIRMATION.
One final but absolutely vital and life-saving declaration and truism is that the Nipah virus is very sensitive to common soaps and detergents. Regular handwashing with soap for at least 20 seconds is one of the most effective ways to break the chain of transmission, even for a virus that is this lethal.
Features
‘Lord Edgware Dies’
It has been some time since I read an Agatha Christie, the plot of which I cannot remember. So, I was delighted to find on the shelves of a friend Lord Edgware Dies, which I had a vague memory of, but no certainty about who had done it.
When I read it, I found that my memory of who was probably the killer was correct, but I could not be certain and the red herrings Christie threw in were so diverting that until almost the very end I wondered if I had been wrong.
The plot is very simple. Jane Wilkinson, who is married to Lord Edgware, tells him that she is desperate for a divorce since she is in love with a very proper Anglo-Catholic peer, Lord Melton, but Edgware refuses to divorce her. She asks Poirot to talk to him, which he does, and is surprised to find that Edgware has told Jane he is prepared to give her a divorce. This was, after he had categorically refused, through a letter, which Jane said she had not received.
That night Edgware is murdered, after Jane had been to see him, or so the butler said, and also Edgware’s secretary. But Jane had been that evening at a grand dinner many miles away, where a dozen fellow guests could swear to her presence.
There was a solution however to the mystery of two Jane Wilkinsons, namely a skilful impersonator called Carlotta Adams who, in the opening chapter had impersonated Jane Wilkinson, who had also been at the performance. But when Poirot goes to see her, he finds that she had been found dead on the morning after Edgware had been killed, of an overdose. And in her bag was a gold case, with a strange inscription, that contained the drug, along with a pair of pince-nez.
Her maid said she had written a letter to her sister in America and posted it the previous night. Poirot asks Inspector Japp to get the letter, and a transcript is received from America, and in it the name of Edgware’s nephew Ronald Marsh is mentioned; he had taken Carlotta to dinner after her performance, with which the book opens, and had then set her a challenge. Japp arrests Marsh, but Poirot is not happy and asks for the original of the letter, which the sister sends him. That shows that a page is missing, and the tear is obvious, though that raises the question as to why it had not simply been cut.
Matters are further complicated by the fact that Marsh had gone in a taxi to the Edgware house, along with Edgware’s daughter Geraldine, in the interval of an opera which had previously seemed to provide them with cast iron alibis. Geraldine had gone in to fetch her pearls so that Marsh could raise money he needed, and thus had an opportunity to kill Edgware, as did Marsh, for the driver said he had got out of the taxi while waiting and gone into the house.
Marsh explained why he had gone to the house on the night of the murder as having followed Bryan Martin, an American actor, who had been in love with Jane, whom he saw go into the house with a key. But there was no one visible when he entered, and Geraldine almost immediately came down and they left together. And Martin too has become an object of suspicion to Poirot, for he had been to see him before the murders were discovered with a story of being followed by a man with a gold tooth – a story Poirot immediately realized was false when he was asked how old the man was, and was told he was young, for young people did not have gold teeth.
A heap of French money Edgware had got for a trip to Paris was missing, but since Marsh had no need for it after his cousin’s offer of help, Poirot deduces that it must have been taken by the butler, who has disappeared. Christie has stressed that he is astonishingly handsome, unusual in a butler, and Poirot notes a resemblance to Martin, so he thinks the mysterious man going into the house must have been him.
Incidentally, later Poirot assumes that Edgware’s change of mind was because he was involved in some scandal, and I believe Christie intends us to see the cause of this in his handsome butler, though this is not specified.
Meanwhile, Poirot has asked Japp to find out the provenance of the case found in Carlotta’s handbag, and it turns out to have been made in Paris, specially commissioned, and collected by a woman with pince-nez.
But then another murder occurs—that of another guest at the grand dinner, which provided Jane with her alibi. The victim is an actor who had been bemused when Jane, at a lunch, thought the Judgment of Paris referred to the city. He told Hastings he wanted to see Poirot, but was killed before he could get to the appointment. Poirot had rushed there when told about his request, but it was too late.
Meanwhile, Poirot has tried out the pince-nez on Edgware’s secretary, but she could not see through these. It was only a chance remark heard outside the theatre that led him to try them out on Wilkinson’s maid Ellis, a spare pair that had been appropriated for the night of the murders.
Poirot then lays things out, having summoned Martin and told him that he probably suppressed Edgware’s letter, as he had been dropped by then and he did not want Jane to marry another. But after teasing Martin, Poirot says that Jane was in fact the murderer, and she got Carlotta to impersonate her at the dinner while she went to the house and killed her husband. After meeting Carlotta later and checking with her through a call that she had
not been rumbled, Jane had gone ahead with the murder – she put veronal into her drink and the case with veronal into the handbag. She forgot to take out the pince-nez she had used earlier to imitate an American. Carlotta had registered as the American in a hotel and Jane had gone to see her, and there they exchanged identities. After seen the letter, she made use of it by tearing off the page that referred to her, and the S of She, so that the person who had challenged Carlotta to impersonate her seemed to be a man.
There is a coda in which Jane, condemned to death, writes to Hastings, still full of pride at her ingenuity hoping she will be remembered.
Features
Desilt reservoirs, learn from our ancient irrigation systems
by Prof. O. A. Ileperuma
Silting of reservoirs is a major problem today affecting our hydropower production and irrigation systems. The main Mahaweli reservoirs are silted to a considerable extent reducing the water holding capacity of them. Due to poor soil management practices, floodwaters deposit large amounts of silt in these reservoirs. When the Polgolla reservoir was fully drained about two years back, one could see mountains of silt in the lower reaches of the reservoir. A rough estimate is that 50% of the total capacity of these reservoirs has been lost to siltation. This is a serious issue which affects not only power and agriculture but also flood control.
Our ancient irrigation systems ensured that desilting of reservoirs took place under royal decree where all users of the reservoirs were ordered to carry out desilting of reservoirs during the dry season. The clay thus collected was used in making bricks for the construction of great stupas which dot the landscape of our ancient kingdoms. This ensured that the reservoirs had their full capacity filled with water for the next cultivating season. Our ancient kings were clever enough not to construct reservoirs by blocking main rivers such as the Mahaweli. A classic example is the Minipe left canal where they tapped only the surface water of Mahaweli. Even the bigger tanks such as Nuwara Wewa and Parakrama Samudraya were fed with minor rivulets. There were also other ingenious features in the cascade irrigation systems built by the ancient kings, such as mud sluice canals and forest reservations between the reservoirs in the cascade system. These reservations helped trap silt and remove excess nutrients, which could otherwise contribute to increasing salinity as water flowed from one reservoir to another.
- Parakrama Samudraya
- Kalawewa
- Kotmale
A classic engineering marvel is the former Yoda Ela, which carries water from Kalawewa to Nuwara Wewa and Tissa Wewa. It is 87 km long although the straight distance between these points is only about 40 km. The gradient of this canal is about 10 cm per km or 6 inches per mile. Yodha Ela functions as a moving reservoir and feeds about 4,600 hectares of paddy lands. It is a winding canal with about 120 smaller reservoirs on its way. It was constructed during the reign of King Dhatusena around 459 AD and later expanded by King Parakramabahu by connecting more reservoirs to the network. Unfortunately, during the Mahaweli project our modern-day engineers constructed a concrete canal replacing the winding path of this Yoda Ela also called Jaya Ganga. This effectively removed the ability of the old Yoda Ela to remove silt and nutrients. The bank of this Ela has wet zone trees such as jak and areca nut growing well. They take up the nutrients from the flowing stream making the water suitable for irrigation later.
Ancient Mesopotamian civilisations depended on dams constructed along the two main rivers, Euphrates and Tigris. After continuous irrigation of their fields over several thousand years, salinity of the irrigated lands increased making them unsuitable for agriculture. People died due to famine and this clearly illustrates the danger of blocking main rivers for agriculture. There is scientific evidence that the salinity of paddy soils in the Mahaweli C area is increasing.
We saw the devastation caused by Cyclone Ditwah. The sluice gates of the Kotmale Reservoir were opened, and Kandy and Peradeniya were flooded. If the reservoir had had greater storage capacity, couldn’t the opening of the gates have been delayed? This may not be an argument that modern-day engineers would readily accept, and I am not an irrigation expert. These ideas may well be naïve. But most of us tend to think of reservoirs mainly in terms of hydropower generation and irrigation, while their role in flood control receives much less attention. The question therefore deserves serious consideration. Could restoring lost reservoir capacity through desilting help improve our ability to manage extreme rainfall and reduce flood risks?
Desilting our reservoirs should be considered a national priority.
Features
Losing out to Ethiopia
Export diversification – Missing the wood for the trees – Part III
by Gomi Senadhira
In Sri Lanka, the word “Ethiopia” is often used as disparaging slang to describe individuals or areas experiencing extreme poverty, starvation, or severe economic hardship. This linguistic habit originated in the 1980s with the Western media coverage of the devastating Ethiopian famine of 1983-85. That media coverage shocked the world but also left an outdated and offensive global stereotype that the country is permanently starving. Much has changed since then. By now, with an annual growth rate of around 9%, it is the fastest-growing economy in sub-Saharan Africa. Ethiopia has also emerged as a highly competitive exporter and is challenging not only its competitors in the region but also countries like Sri Lanka. This article is on how Sri Lanka has lost ground to Ethiopia (and a few other countries) in the GCC markets for agricultural and floricultural products.
Sri Lanka – A Pioneer in the Agriculture and Floricultural Market in the GCC
As discussed in Part II of this article, by the mid-1980s Sri Lanka had established a strong foothold in the GCC’s fruit, vegetable, and floricultural market. Geographical proximity and well-established shipping and air links gave Sri Lanka a strong comparative advantage over Southeast Asian and African nations. Thailand, Vietnam, and Kenya were not even in the market. At that time, Ethiopia was experiencing (as BBC news reports described) “a biblical famine”.
The market was not very large, but it was lucrative and growing. Trade Minister Lalith Athulathmudali as well as the Chairman of the Export Development Board, Victor Santiapillai, who visited Kuwait (and the GCC countries), recognised the market potential for these products and encouraged us to continue with our work. The minister was particularly keen to further develop links between the market for these products, exporters, and his Export Production Villages (EPVs). So, it was becoming a successful case not only for export diversification but also for transferring gains from exports directly to rural households.
From Trailblazer to Tailender
As a result, even by the beginning of this century Sri Lanka had a larger market share than most of its competitors from Asia or Africa. But since then, our competitiveness has weakened significantly. The tables below provide a comparative snapshot of Sri Lanka’s performance vis-à-vis Thailand, Vietnam, Kenya and Ethiopia in the GCC market for vegetables, fruits and floricultural products. As illustrated therein, in 2001 Sri Lanka was ahead of Thailand, Kenya and Ethiopia in this small but rapidly growing market. Since then, we have fallen behind Thailand, Kenya and many other countries in that lucrative market. If this trend continues, Sri Lanka will fall behind Ethiopia within the next few years. (See Table 1)
In the GCC market for vegetables (covered in HS chapter 07), Sri Lanka was ahead of most other competitors in 2001. As illustrated in Table 1 , Sri Lanka had failed to develop this market, while Thailand, Kenya, and even Ethiopia had very efficiently increased their market shares. The GCC is a market to which Sri Lanka can supply some vegetables, like cabbages, by sea. It appears Sri Lanka had also failed to exploit this mode of supply.
We can see a similar trend in the market for fruits. Vietnam, Kenya, and Thailand have emerged as major players, while exports from Sri Lanka have staggered on slowly. In this segment, Vietnam has emerged as a leading player during the last twenty years and the GCC imports from Viet Nam have shot up from US$44 thousand in 2001 to US$346 million by 2024. In part one of these articles, I discussed the remarkable increase of jackfruit exports from Vietnam “…just $3 million in 2015 to an impressive $236.8 million in 2023” while most of our jackfruit production rots under the trees. This explains how countries develop their markets, geographically and product-wise. (See Table 2)
Sri Lanka’s performance has been weakest in the market for floricultural products (HS Chapter 06), which groups live trees, cut flowers, and ornamental foliage. When we first entered the market in the 1980s, the market was dominated by the Netherlands, and Kenya and Ethiopia were not even in the market. At that time, we identified the Gulf states as a market where Sri Lanka could have a dominant presence due to geographical proximity. Even in 2001, Sri Lanka was ahead of Kenya, Ethiopia, and Thailand. But by now, Kenya has emerged as the dominant supplier. Ethiopia is also expanding its market share and is the third-largest exporter. (See Table 3)
Missing the Wood for the Trees
In the mid-1980s, Sri Lanka first established its foothold in the GCC market. Since then, Thailand, Vietnam, Kenya, and even Ethiopia have moved well ahead of us and have become leading players. Why did we lag behind in our export diversification efforts in general and, more particularly, in the GCC market?
The reasons are very clear. After the initial attempts in the 1980s and early 1990s, Sri Lanka has not been proactively involved in identifying, developing, and promoting new products and markets, or protecting and further developing new markets already established. The focus has simply been on traditional exports: tea, coconut, cinnamon, and garments, while other products were almost ignored. In essence, we have been and continue to focus intensely on a narrow group of products and markets, and we have lost sight of the bigger picture.
(The writer can be reached at senadhiragomi@gmail.com)
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